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A daily view of all the goings-on at ASTRON and JIVE.

older | 1 | .... | 12 | 13 | (Page 14) | 15 | 16 | .... | 71 | newer

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    © ASTRON

    Yesterday, ASTRON and the Polish LOFAR consortium POLFAR signed a contract for the construction of three new antenna stations for the International LOFAR Telescope (ILT), in the north, west and south of Poland. Signing of the contract took place at the University of Warmia and Mazury in Olsztyn in Poland in the presence of representatives of ASTRON, the Polish Ministry of Science and Higher Education, local governments, and representatives of the Polish astronomical and space sciences communities.

    At the end of 2013, POLFAR received a grant from the Polish Minister of Science and Higher Education for the construction and equipment of three international LOFAR stations as part of their national research infrastructure investment. The new LOFAR stations will be located in Łazy (in southern Poland, operated by the Jagiellonian University in Krakow), Ba�dy (in northern Poland, operated by the University of Warmia and Mazury in Olsztyn), and Borowiec (in western Poland, operated by the Space Research Centre of the Polish Academy of Sciences). The formal agreement between the POLFAR consortium and ASTRON now marks the start of the preparations for the roll-out of these new stations.

    Astronomical interests in Poland range from neutral hydrogen distribution in the early universe, to the timing of pulsars and studies of magnetic fields in various intergalactic, interstellar, planetary, and solar environments.

    The International LOFAR Telescope has 38 stations in the Netherlands, six in Germany, and one each in France, Sweden and the United Kingdom. Connecting the three new POLFAR stations will add valuable extra sensitivity to the array. Moreover, the Polish stations provide new baselines of up to 1550 km in the array, making the ILT a much more capable instrument for high resolution imaging of detailed structures. Finally, the positions of the new stations literally provide new angles on ionospheric tomography.

    The manufacturing of all components for the POLFAR stations, such as the thousands of antenna elements, and electronics, are to be contracted out to industry. The construction of the three new stations will start immediately and is estimated to be completed before the end of 2015.

    The image shows the representatives of POLFAR and ASTRON at the LOFAR signing ceremony:

  • Prof Jerzy Jaroszewski (Vice Rector for Research of University of Warmia and Mazury)

  • Prof Andrzey Krankowski (University of Warmia and Mazury)

  • Prof Katarzyna Otmianowska-Mazur (coordinator of POLFAR, Astronomical Observatory of the Jagiellonian University)

  • Dr Marian Soida (Vice Director of the Astronomical Observatory of the Jagiellonian University in Krakow)
  • Mr Ronald Halfwerk (ASTRON)

  • Ass Prof Hanna Rothkaehl (Space Research Center of Polish Academy of Sciences in Warszawa)

  • Dr Rene Vermeulen (ASTRON)

  • Dr Krzysztof Chyy (Astronomical Observatory of the Jagiellonian University)

  • Ass Prof Ewa Szuszkiewicz (Head of the Institute of Astronomy and Astrophysics of the Szczecin University)

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    © JvL

    The early dawns and the starting summer weather make the week with the year's longest days perfectly suited for bike rides. Over the last few years a number of ASTRON-ers that live significantly far from Dwingeloo have used this week for an annual Bike to Work trip. The group has grown and this year includes rides from Utrecht, Amersfoort, Zwolle, Meppel and Groningen. You should join us on Monday June 16!

    On this doodle:

    You can sign up and/or see who to get in touch with, to join.

    If you need to plan you own trip, you can use the Cyclist Association's direction planner, that allows for scenic, direct bike-friendly planning that you can export to your GPS/phone:

    See you, all refreshed, tanned and healthy, at coffee or lunch on the 16th!

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    © ASTRON

    ASTRON has a new Board member - Albertiene Hadders. Abertiene's background is in finance, (interim) management and business strategy. She lives in Groningen, and is also keenly interested in sport, indeed she has represented the Netherlands in hockey. Albertiene also sees sport as a vehicle to help under privileged children - in addition to being a member of many different boards and oversight bodies, she is currently chairperson of the "Jeugdsportfonds Groningen".

    Albertiene recently visited ASTRON as part of her introduction to her Board duties, and was given a tour of the building and our facilities - one of her personality traits is to be "interested in everything" - she certainly seemed impressed with the work going on in our labs and is clearly very much looking forward to her new role on the ASTRON Board.

    In addition to Albertiene, the current ASTRON board now includes Prof. Karel Gaemers (chair), Sipke Swierstra (also chair of the LOFAR RvT), Prof. Johan Bleeker (former General Director of SRON), Prof. J. de Hosson (Professor of applied physics at the University of Groningen) and Prof. Josee van Eindhoven (Professor in Sustainable Management at the Dutch Research Institute for Transitions, DRIFT, Erasmus University Rotterdam).

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    © astron

    Last week, almost everybody of some importance in the international radio astronomy community was at Sicily to discuss updating the SKA science case. The previous printed version of the SKA science case dates from 2004 so, obviously, it is time to update it.

    From 8-13 June, at Giardini Naxos near Mt. Etna in Sicily, more than 250 people (including many from Astron & Jive) attended a week-long meeting with many many talks and discussions. From the meeting it was clear that the science case of SKA is stronger than ever. In particular the variety, breadth and depth of science themes was impressive and it was good to see that Dwingeloo astronomers are involved in almost all of them. The meeting also made clear that community is very eager to start using SKA. We should really start building the bloody thing...

    There were several non-scientific highlights at the meeting. One of these was, one evening while enjoying drinks on the beach, to see lava being spewed out by Mt. Etna. Another was, during the conference dinner, a huge SKA cake. Fitting for his role as 'Il SKA Padrino', Phil Diamond made sure everybody got his/her proper piece of the SKA cake (note the re-baseline cut�). Baciamo le mani.

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  • 06/15/14--17:00: The Dwingeloo Complex
  • © ASTRON

    Since it is easy to download an ASTRON/JIVE Daily Image from the archive (just right-click on it), this is done by many people, for instance to add some extra cachet to their presentations. We expect that this recent aerial picture of the two sister institutes in the trackless forest of Dwingeloo will be used frequently.

    The picture was taken in late 2013, just after the newly refurbished dish of the 25m telescope was hoisted back into place. It has now started its second career as a national monument and outreach telescope.

    Seen from above, the recent additions to the building complex stand out rather clearly by the color of the roof. They separate the somewhat less flamboyant R&D lab (left) and the Astronomy building (right), but also provide the bridges between them.

    For more images, covering the last half century or so, just press the Archive button at the top of the page to browse the AJDI archive. You will be surprised.

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  • 06/17/14--17:00: Yearly ASTRON R&D outing
  • © -

    On June 5th, the R&D department of Astron had its yearly outing. Although it was only announced as "something fun", almost everyone signed up(*). This year, we stayed extremely close to Astron: the destination was only 3 km away. Which was why we took a 16 km detour to get there, on tandems.

    The destination was another spot on the Dwingelerveld, a nice place in the forest. There was an outdoor competition with the following elements: riding a unicycle, walking in the forest blindfolded, a timed balancing act, escaping from tied ropes and carrying balls up a hill. From this description and the pictures above it should be clear that it was the enthousiasm of everyone that made it, indeed, fun.

    We were somewhat unlucky with the weather, which made that the planned barbecue took place in tents. And also that we couldn't bike the tandems back, because it was pouring. That's why we all tried to get in Eim's car, which of course got stuck in the mud. The last group activity was pushing Eim out, get the Astron cars, and get everyone back to Astron.

    Thanks everyone for a nice day!

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    © Manel Perucho (Universitat de Valencia)

    I will review recent results from numerical simulations of relativistic jets in the context of parsec-scale jets and long-term evolution in the kiloparsec scales, both using the code Ratpenat. The first part of my talk will be devoted to parsec-scale jets. We have investigated the interaction between travelling shock waves and standing recollimation shocks in the context of a detailed observational work of the blazar CTA 102. In order to compare our simulations with the observed evolution, we have computed synthetic light curves and VLBI maps, accounting for both synchrotron and adiabatic losses. Our results show that the observed spectral evolution of the source can be qualitatively explained by shock-shock interaction, which could lead to a significant increase in the emission. In the second part of my talk, I will present recent results on the impact of relativistic AGN jets in their surroundings following from long-term simulations of relativistic jets with different powers and composition. Our simulations reproduce some of the observed features in powerful large-scale AGN jets and show key differences in the evolution of the different jets in terms of the spatial and temporal scales of energy deposition. I will discuss these differences and also those with slow and massive outflows, commonly claimed to be responsible for AGN kinetic feedback. Finally, I will give a number of conclusions that can be extracted from our work and which can be relevant to the study of AGN feedback.

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  • 06/19/14--17:00: Goodbye to Pavillion West
  • © Tammo Jan Dijkema, Bram Veenboer

    On June 20th 2014 we finally said goodbye to Pavillion West(*). It is the last of three temporary shacks (**) that have housed the offices of various groups of employees during the years of transition and reshuffling.

    Since the initial inhabitants of Pavillion West were not happy for some reason, it was decided to put the software people there. They thrived, of course, and rapidly developed a separate sub-culture, with soft furniture and picnic facilities. It can only be hoped that they will be equally productive now that they are back in the more formal surroundings of the building proper.

    The pavillion was taken apart and removed in a remarkably short time, by a small number of people who had obviously done it before. A bit like rolling out new stations for the ever-expanding LOFAR telescope.

    (*) Also fondly known as "Outhouse One".

    (**) The other two were placed between the Astronomy building and the Guesthouse, and attached the South of Pavillion West.

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    © SKA-TSM

    Before embarking on the mass-production of a sub-system, e.g. for SKA, it is imperative to have full confidence in the suitability of all its various components. In the case of newly developed items, rapid prototyping allows several iterations of testing and improvement, thus increasing confidence.

    ASTRON is taking this ability to a higher level by investigating the possibilities of Moulded Interconnect Devices (3D-MID). This is a process that is widely used in the automotive and the cell phone industry, for mass-producing parts that integrate 3D plastic structures with 3D electronic circuits.

    At this moment, the SKA-TSM team has succeeded in plating a complete plastic 3D-printed part with a conductive layer (bottom picture). This success can already be used for shielding purposes.

    They have also succeeded in producing and 3D-printing conductive plastic. These two steps are the first towards locally metallizing plastic parts, and a step closer to prototyping 3D-MID parts.

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    Note the unusual day (tuesday) and time (11:00)

  • The Chinese Space Science Programme:

    The National Space Science Center (NSSC) of the Chinese Academy of Sciences (CAS) is China's gateway to space science. It is the key institute responsible for planning, developing, launching, and operating China's space science satellite missions. It also spearheads space science research in the fields of space physics, space environment, microwave remote sensing, space engineering technology, etc. NSSC is the home of the National Key Laboratory of Space Weather, two CAS key laboratories, a Russia-China Joint Research Center on Space Weather, and a sounding rocket launch site in Hainan Province. See for more information.

    The left figure shows the alignment of the Kelvin-Helmholtz wave/vortex axis and geomagnetic field lines at the low-latitude magnetopause boundary layer during northward interplanetary magnetic field conditions, reproduced using a self-developed global MHD simulation model (PPMLR-MHD).

  • The Dark Age Interferometric Array (DAIA, right figure):

    The Dark Age is one of the last epochs of the Universe to be explored. Studying the Dark Ages will provide great contributions to the small-scale angular power spectrum, precision cosmology, and more. This epoch can be probed using the redshifted 21-cm radiation from neutral hydrogen. A space mission avoids observations being affected by the ionosphere and radio frequency interference (RFI). Satellites in a lunar orbit are favoured because of the RFI-free zone behind the far side of the moon. The DAIA concept includes baselines of over 100 km and full UV coverage by 15 satellites, and relies on expertise in nano satellite technology, interferometric radiometers, radio astronomy, etc.

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  • 06/24/14--17:00: Sunflower Galaxy
  • ©

    This beautiful galaxy, known as M63 or NGC 5055, was discovered by Pierre Mechain on June 14, 1779. It is member of the M51 Group of galaxies in the constellation Canes Venatici (Hunting Dogs). The last supernova in this galaxy (not visible in this image) was seen in 1971 and reached magnitude 11.8. Its distance is estimated at 37 million light year.

    NGC 5055 has been observed with the WSRT several times over the years. It is famous for its warped disk of neutral hydrogen which extend to well beyond the limits of this optical picture. The WSRT images of the neutral hydrogen disk of NGC 5055 even ended up in the book Galactic Dynamics by Binney and Tremaine, generally considered to be 'the Bible' on the topic.

    The image above was made from Beilen on May 2nd 2014. The total integration time is 3 hours and 10 minutes, with a 400mm F/4.5 telescope and CCD camera.

    At the height of our high-latitude summer, perpetual twilight is preventing more deep imaging. But starting from the end of July we will get some real darkness again at night.

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    © R. P. Deane et al.

    Supermassive black holes in the centre of galaxies play an important

    role in the evolution of their hosts. How these giant black holes were formed

    in the first place and how they grew with time is not clearly understood,

    but galaxy mergers -that may have eventually led to the merging of their

    central black holes- appear to be a natural explanation. If this is true,

    then one expects to see a number of dual or even multiple supermassive

    black hole systems in some galaxies. However, we only know of very few

    examples so far, in particular at low separations. Very Long Baseline

    Interferometry (VLBI) is a powerful tool to find and confirm close pairs

    of supermassive black hole systems due to its great resolution.

    Dr. Roger Deane et al. announced the discovery of a triple black hole system

    in which the tight inner pair of black holes were resolved by the

    European VLBI Network (EVN). The Westerbork Synthesis Radio Telescope

    was part of the observations, and the data were correlated at the

    Joint Institute for VLBI in Europe in Dwingeloo. These systems are important

    for various reasons. In terms of galaxy evolution it is known that black holes

    -especially in active galactic nuclei (AGN)- influence how galaxies evolve,

    and understanding how often black holes themselves merge is key to this work.

    Furthermore, closely orbiting systems such as this are sources of gravitational

    waves in the Universe, if General Relativity is correct. Future radio telescopes

    such as the SKA will be able to measure the gravitational waves from such

    systems as their orbits decrease.

    While the VLBI technique was essential to discover the inner two black holes

    (which are in fact the second closest pair of supermassive black holes known),

    Deane and co-authors have also shown that the binary black hole presence can be

    revealed by much larger scale features. The orbital motion of the black hole is

    imprinted onto its large jets, twisting them into a helical or corkscrew-like

    shape. So even though black holes may be so close together that our telescopes

    can’t tell them apart, their twisted jets may provide easy-to-find pointers to

    them, much like using a flare to mark your location at sea. This may provide

    sensitive future telescopes an additional way to find binary black holes with

    much greater efficiency.

    The image shows a sketch of the triple system with helical jets from one of the

    supermassive black holes. The third black hole is part of the system, but farther

    away and is likely to emit relatively straight jets. The inset shows the

    EVN 1.7 GHz image (contours) overlaid on the EVN 5 GHz image (colour scale).

    The results are published in Nature:

    See also the JIVE press release here:

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  • 06/26/14--17:00: So close...
  • © Madroon Community Consultants (MCC)

    On 25 June, the Christiaan Huygens Science Prize 2014 was awarded in the category Information and Communication Technology. The four young finalists had been selected on the basis of their recent PhD thesis, in a gruelling process of elimination. We are very proud that our own Stefan Wijnholds was one of them, with his thesis Fish-Eye Observing with Phased Array Radio Telescopes (Delft 2010, Cum Laude, as is his habit).

    The picture shows the 4 contenders being interviewed by Maarten Huygen, a prominent journalist. In the end, the winner was Dr Bart Jansen (left, eclipsing the picture of Huygens), for his thesis The Power of Data Reduction: Kernels for Fundamental Graph Problems. The others were Dr Alexandra Silva (Kleene Coalgebra), Dr Jacopo Urbani (On Web-scale Reasoning). The inset shows Stefan flanked by his proud thesis supervisors, Prof Alle-Jan van der Veen (Delft) and Dr Jaap Bregman (ASTRON).

    During the various speeches, ASTRON got quite a bit of glowing exposure, which was not lost on Dr Jet Bussemaker, the Minister of Education. Part of the praise came from Stefan himself, who emphasized that there are "at least 50" people at ASTRON with whom he can discuss his subject(s).

    Apart from being promising young scientists, all 4 finalists were remarkably eloquent, saying sensible things about the best conditions for scientific success. And they were savvy enough not to be lured into commenting on national science policy. They will go far, just like their predecessors.

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    © Secretary ASTRON/JIVE

    Each year, the ASTRON/JIVE secretaries organize an outing with a theme that is somehow closely related to ASTRON/JIVE activities. This year, Marja Carnal came up with the idea to visit our neighbours Natuurmonumenten (the national society for Nature preservation) for a stroll over the Dwingelderveld with a guide.

    The guide showed a part of the Dwingelderveld that has recently been re-developed back to nature. This new nature, together with the fact that this is wet heathland again, has already attracted a lot of new species of both fauna and flora, and it is expected that others will follow.

    After this nice stroll, which was only disrupted by some annoying mosquitos, we went to restaurant De Huiskamer for a lovely dinner on their wonderful terrace. The presentation of some of the dishes was quite amazing, as shown in one of the pictures.

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    © ASTRON, 2014

    Just some impressions of the APERTIF Phase Locked Loop Unit (PLL) which was installed in radiotelescopes 2 and 5 at the Westerbork site on June 24th.

    The PLL is a vital part of the Local Oscillator Generation system (LOG). With the LO-Generator Control Board, the Divider Unit and the Buffer Board (both coming soon to your AJDI) they form the LOG Subrack. Two of the LOGs are connected to the APERTIF Down Converter Units (DCU), (see also here). These systems mix down the antenna signals to the baseband so that the Analog-to-Digital Converter Unit (ADU) can convert it eventually to a digital data stream.

    Design and production of the PLL unit is another good example for the outstanding collaboration between our mechanical and electronic department here at the ASTRON labs. Keeping phase drift between the different units under control was a big challenge, but fruitful discussions between mechanical- and radio engineers have led to a well performing system at reasonable cost. The slideshow depicts some aspects of mechanical design, control soft- and hardware development and the qualification in the climate chamber.

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  • 06/30/14--17:00: Cobalt project finished
  • © (c) Astron 2014

    Today, after only one and a half year of hard work by a small team spanning Astron's Radio Observatory, R&D division, and Astronomy group, and Groningen University's Centre for Information Technology (CIT), we celebrate the end of the Cobalt development project.

    Cobalt is the digital backend that replaced LOFAR's IBM BlueGene/P supercomputer (the big black thing on the right) at the 24th of April 2014. The 9-PC computer cluster -- 8 active servers and one spare, all sporting bright blue lights -- performs most calculations on NVIDIA K10 graphics processing units (GPUs).

    About a year ago, we produced the first interferometric map of the Sun and Taurus A (top left) from a tiny amount of pre-recorded data, using off-line correlations. Now we can correlate 96 MHz of bandwidth from all 70 stations (antenna fields) that are currently part of the International LOFAR Telescope (ILT). What's more, we can do it in real time (top right), with capacity to spare!

    The full core beamformer is almost as feature-complete as the BG/P beamformer was, and can detect faint millisecond pulsar signals in only a few minutes of data (bottom). Cobalt's main development effort has ended now, and it has become part of regular LOFAR operations, maintenance, and development. We look forward to many Petabytes of great quality data!

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  • 07/02/14--17:00: DOME Microserver Premiere
  • © ASTRON & IBM

    Microserver event

    ASTRON, IBM and three members of the Dome Users Platform are proud to host a Dome Premiere at ASTRON's Van de Hulst auditorium. Dome is the research project in which ASTRON and IBM have joined forces to create new technology for handling the huge amounts of data that will be generated by the Square Kilometre Array (SKA). After about two years of hard work, we are happy to share a memorable moment with you, introducing our newly developed, high-performance microserver.

    Innovative microserver: small, powerful, and energy-efficient

    The microserver we are showing today is a small, low-cost, low-power device, working like a full-fledged server. This technology will play an essential role in future datacenters and many other applications. This microserver redefines the term 'high-density': a 64-bit server CPU placed on a 133 x 55 mm board. It is not only very compact, it is also very energy-efficient. One of its innovations is optional hot-water cooling, which also supplies electrical power.

    Programme 3 July 2014

    13.30: Reception

    14.00: Word of welcome by Albert-Jan Boonstra

    14.05: �The Microserver and the Microserver Ecosystem� and �Microserver Application Areas� by Ronald Luijten, IBM Z�rich

    14.50: �Making the difference in PCB design� by Ronald Otter, Strukton/Roneda��..

    15.15: Break

    15.35: �From Big Ideas to Micro-Engineering", by Tom Lamers, Transfer DSW

    16.00: �Challenges in Future Microserver Designs�, by Hans Klos, Sintecs

    16.25: Microserver developments, next steps, by Gert Kruithof, ASTRON

    16.40: Exchanging knowledge and contact info over drinks

    17.15: End of session

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  • 07/03/14--17:00: The GBNCC pulsar survey
  • © Kevin Stovall

    Pulsars are fascinating objects, radio-emitting neutron stars spinning as fast as hundreds of times per second. They have been used to study theories of gravity, supernova explosions, and the interstellar medium. Currently there is an international effort to use them to detect for the first time the gravitational waves predicted by Einstein's theory of gravity. But to do this we must find more stable, fast-spinning pulsars. The best way to do this is to systematically scan a telescope over the whole sky searching for radio pulsations from each direction. This paper describes one such very effective search, the Green Bank North Celestial Cap (GBNCC) survey.

    The GBNCC survey is carried out with the Robert C. Byrd telescope in Green Bank, West Virginia. This is a huge 100m by 110m single dish that can be pointed anywhere in the sky. We are observing at 350 MHz, where pulsars are very bright and where the beam covers about a degree of sky. The goal is, between this and the similar Green Bank drift scan survey, to survey the entire sky visible from Green Bank. So far the GBNCC survey has carried out more than 48000 pointings (see image), with more being observed as this is being written. The drift scan survey found many pulsars, including several fascinating and exotic systems, and the GBNCC is finding many more.

    The GBNCC is run by a worldwide group of astronomers, including ASTRON's own Jason Hessels, Vlad Kondratiev, and Anne Archibald. Follow-up of the discovered pulsars is being carried out with many telescopes, including Westerbork and LOFAR. LOFAR's multi-beaming capability makes the telescope unique in its ability to localize rotating radio transients.

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    © Astron

    Massive outflows driven by active galactic nuclei are widely recognized to have a key role in the evolution of galaxies. These outflows heat the ambient gas, expel it from the central regions of the galaxy, and thereby affecting the star formation process of the galaxy. It has been proposed that the powerful jets of relativistic particles (such as electrons) launched by active nuclei can both accelerate and heat the molecular gas, which often dominates the mass budgets of the outflows.

    Clear evidence for this mechanism, in the form of detailed associations between the molecular gas kinematics and features in the radio-emitting jets, has however been lacking. In a paper which appeared in Nature today (led by Clive Tadhunter (Sheffield) and including Raffaella Morganti, Tom Oosterloo (ASTRON/Kapteyn Institute) and Raymond Oonk (ASTRON/Leiden)), the first unambiguous evidence that jets do indeed drive molecular outflows is presented.

    Observations with the ISAAC spectrograph at the VLT show that the warm molecular hydrogen gas at the location of the western radio lobe of the Seyfert galaxy IC 5063 is moving at high velocities -up to about 600 kilometres per second- relative to the galaxy disk. The fact that the outflow exactly occurs at the location where the jet hits the interstellar medium, strongly suggests that the molecules have been accelerated by fast shocks driven into the interstellar medium by the expanding radio jets.

    This result will inspire many further observations. In particular ALMA is very well suited to image in great detail the kinematics of molecular gas in galaxies and is a great instrument to use to further study the physics of jet driven gas outflows (stay tuned...).

    The full title of the paper is: Jet acceleration of the fast molecular outflows in the Seyfert galaxy IC 5063, C. Tadhunter (Sheffield), R. Morganti (Astron/Groningen), M. Rose (CfA), J. B. R. Oonk (Astron/Leiden) & T. Oosterloo (Astron/Groningen) and is available on Astro-ph

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    © ASTRON

    ASTRON recently prepared and submitted a Mid-term Report (MTR) to NWO, about how the institute has responded to the recommendations that emerged from last institute evaluation in 2011, and looking forward over the next 3 years towards the next full evaluation in 2017.

    In order to create the right impression, graphic designer and illustrator Dannielle Futselaar ( ) was asked to produce a striking front cover. It depicts the International LOFAR Telescope (ILT) - a distributed ICT instrument spanning 1000's of km via optical fibre links.

    We are very happy with the result!

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