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TOPIC: LOFAR telescope
Blobrana


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The Minister for Education Jan Björklund will inaugurate the Swedish part of LOFAR, the world's largest radio telescope. The inauguration will take place on the 26th September at the Onsala Observatory in northern Halland. It will be the largest new radio telescope in Sweden since the observatory's 20-meter telescope was inaugurated by the King in 1976.
Source (Swedish)



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Title: LOFAR: Early imaging results from commissioning for Cygnus A
Authors: John McKean, Louise Ker, Reinout J. van Weeren, Fabien Batejat, Laura Birzan, Annalisa Bonafede, John Conway, Francesco De Gasperin, Chiara Ferrari, George Heald, Neal Jackson, Giulia Macario, Emanuela Orrù, Roberto Pizzo, David Rafferty, Huub Rottgering, Aleksandar Shulevski, Cyril Tasse, Sebastiaan van der Tol, Ilse van Bemmel, Ger van Diepen, Joris E. van Zwieten, for the LOFAR collaboration

The Low Frequency Array (LOFAR) will operate between 10 and 250 MHz, and will observe the low frequency Universe to an unprecedented sensitivity and angular resolution. The construction and commissioning of LOFAR is well underway, with over 27 of the Dutch stations and five International stations routinely performing both single-station and interferometric observations over the frequency range that LOFAR is anticipated to operate at. Here, we summarize the capabilities of LOFAR and report on some of the early commissioning imaging of Cygnus A.

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LOFAR makes deeper images of Universe than ever before

An international team led by astronomers at ASTRON and the Kapteyn Institute of the University of Groningen have used the LOFAR telescope, designed and constructed by ASTRON, to make the deepest wide-field images of the sky in the relatively unexplored part of the spectrum around 150 MHz. It reveals faint radio sources never seen before.
The results were presented at an international conference in Zadar, Croatia, last week (May 23-27) and were eagerly awaited by the astronomical community. The Zadar conference (organised by team member dr. V. Jelic, ASTRON), discussed the properties of the foregrounds that trouble our view of the distant Universe.
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LOFAR takes the pulse of the radio sky

A powerful new telescope is allowing an international team lead by University of Manchester scientists to have their "best-ever look" at pulsars: rapidly rotating neutron stars, created when massive stars die.
In the first refereed scientific results from the new European telescope LOFAR (Low Frequency Array) soon to appear in Astronomy & Astrophysics, the scientists present the most sensitive low-frequency observations of pulsars ever made.
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Giant radio telescope goes multi-national - first images from LOFAR

In the quest to discover more about our Universe and the birth of stars and galaxies, a new UK telescope connected for the first time to others across Europe has delivered its first 'radio pictures'. The images of the 3C196 quasar (a black hole in a distant galaxy) were taken in January 2011 by the International LOFAR Telescope (ILT). LOFAR (Low Frequency Array), which is co-ordinated by ASTRON in the Netherlands, is a network of radio telescopes designed to study the sky at the lowest radio frequencies accessible from the surface of the Earth with unprecedented resolution.
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New telescopes peer back to birth of first stars

A new network of telescopes will allow astronomers to peer deeper into space than ever before, enabling them to see the first stars and galaxies in the universe being born.

Using a new type of telescope, which detects low-frequency radio signals coming from outer space, scientists claim they will be able to see deeper into space, and so view events that occurred further into the universe's past due to the time it takes for the radio waves to reach Earth, than has previously been possible.
A network of 77 of these new telescopes is being built across Europe and will be combined with two other radio telescopes in the southern hemisphere to give an unprecedented view of the heavens.
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LOFAR is the LOw Frequency ARray for radio astronomy. LOFAR will be the largest radio telescope ever built, using a new concept based on a vast array of omni-directional antennas. The project is based on an interferometric array of radio telescope's using 15.000 small antennas and 77 larger stations. These stations are distributed across the Netherlands, five stations in Germany, and one each in Great Britain, France and Sweden. Further stations may also be built in other European countries. The total effective collecting area is approximately 1 square kilometer, with the data processing performed by a Blue Gene/P supercomputer situated in the Netherlands at the University of Groningen.

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Onsala LOFAR test station
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Initial observations with the Onsala LOFAR test station

LOFAR (LOw Frequency ARray) is a new low frequency radio array that is presently being constructed. Onsala Space Observatory is planning to eventually host a full LOFAR station. This will consist of 96 low band 30-120MHz antennas and a similar number of high band antennas covering 120-240MHz. Connected to the central processor over the public Internet the station will provide baselines of 600km to the central core in the Netherlands. The longer baselines allowed by sitting LOFAR elements in Sweden and other European countries will greatly increase the resolution of LOFAR enabling a wide range of new astronomical observations.
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Title: A LOFAR RFI detection pipeline and its first results
Authors: A.R. Offringa, A.G. de Bruyn, S. Zaroubi, M. Biehl

Radio astronomy is entering a new era with new and future radio observatories such as the Low Frequency Array and the Square Kilometer Array. We describe in detail an automated flagging pipeline and evaluate its performance. With only a fraction of the computational cost of correlation and its use of the previously introduced SumThreshold method, it is found to be both fast and unrivalled in its high accuracy. The LOFAR radio environment is analysed with the help of this pipeline. The high time and spectral resolution of LOFAR have resulted in an observatory where only a few percent of the data is lost due to RFI.

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Queen opens new LOFAR telescope in Drenthe

The world's largest radio telescope LOFAR was officially launched on Saturday June 12th by Queen Beatrix of the Netherlands during a special ceremony. This ceremony took place in the central LOFAR area of about 400 hectare between Exloo and Buinen in the eastern part of Drenthe, the Netherlands.
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