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Sökning: onr:"swepub:oai:research.chalmers.se:246851" > LBCS: The LOFAR Lon...

LBCS: The LOFAR Long-Baseline Calibrator Survey

Jackson, N., (författare)
University of Manchester, Manchester, United Kingdom
Tagore, A., (författare)
University of Manchester, Manchester, United Kingdom
Deller, A., (författare)
Netherlands Institute for Radio Astronomy (ASTRON), Dwingeloo, Netherlands
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Moldon, J., (författare)
University of Manchester, Manchester, United Kingdom, Netherlands Institute for Radio Astronomy (ASTRON), Dwingeloo, Netherlands
Varenius, Eskil, 1986- (författare)
Chalmers tekniska högskola, Chalmers University of Technology
Morabito, L., (författare)
Leiden University (UL), Leiden, Netherlands
Wucknitz, O., (författare)
Max Planck Society for the Advancement of Science (MPG), Bonn, Germany
Carozzi, Tobia, 1966- (författare)
Chalmers tekniska högskola, Chalmers University of Technology
Conway, John, 1963- (författare)
Chalmers tekniska högskola, Chalmers University of Technology
Drabent, A., (författare)
Tháringer Landessternwarte Tautenburg, Camburg, Germany
Kapinska, A. D., (författare)
University of Portsmouth, Portsmouth, United Kingdom, University of Western Australia, Perth, Australia, ARC Centre of Excellence for All-sky Astrophysics (CAASTRO), Sydney, Australia
Orru, E., (författare)
Netherlands Institute for Radio Astronomy (ASTRON), Dwingeloo, Netherlands
Brentjens, M., (författare)
Netherlands Institute for Radio Astronomy (ASTRON), Dwingeloo, Netherlands
Blaauw, R., (författare)
Netherlands Institute for Radio Astronomy (ASTRON), Dwingeloo, Netherlands
Kuper, G., (författare)
Netherlands Institute for Radio Astronomy (ASTRON), Dwingeloo, Netherlands
Sluman, J., (författare)
Netherlands Institute for Radio Astronomy (ASTRON), Dwingeloo, Netherlands
Schaap, J., (författare)
Netherlands Institute for Radio Astronomy (ASTRON), Dwingeloo, Netherlands
Vermaas, N., (författare)
Netherlands Institute for Radio Astronomy (ASTRON), Dwingeloo, Netherlands
Iacobelli, M., (författare)
Netherlands Institute for Radio Astronomy (ASTRON), Dwingeloo, Netherlands
Cerrigone, L., (författare)
Netherlands Institute for Radio Astronomy (ASTRON), Dwingeloo, Netherlands
Shulevski, A., (författare)
Netherlands Institute for Radio Astronomy (ASTRON), Dwingeloo, Netherlands
ter Veen, S., (författare)
Netherlands Institute for Radio Astronomy (ASTRON), Dwingeloo, Netherlands
Fallows, R. A., (författare)
Netherlands Institute for Radio Astronomy (ASTRON), Dwingeloo, Netherlands
Pizzo, R., (författare)
Netherlands Institute for Radio Astronomy (ASTRON), Dwingeloo, Netherlands
Sipior, M., (författare)
Netherlands Institute for Radio Astronomy (ASTRON), Dwingeloo, Netherlands
Anderson, J., (författare)
German Research Centre for Geosciences (GFZ), Potsdam, Germany
Avruch, I. M., (författare)
University of Groningen, Groningen, Netherlands, Netherlands Institute for Space Research (SRON), Utrecht, Netherlands
Bell, M. E., (författare)
CSIRO Astronomy and Space Science, Perth, Australia
van Bemmel, I., (författare)
Joint Institute for VLBI in Europe (JIVE), Dwingeloo, Netherlands
Bentum, M. J., (författare)
University of Twente, Enschede, Netherlands, Netherlands Institute for Radio Astronomy (ASTRON), Dwingeloo, Netherlands
Best, P., (författare)
University of Edinburgh, Edinburgh, United Kingdom
Bonafede, A., (författare)
Universität Hamburg, Hamburg, Germany
Breitling, F., (författare)
Astrophysikalisches Institut Potsdam, Potsdam, Germany
Broderick, J. W., (författare)
Netherlands Institute for Radio Astronomy (ASTRON), Dwingeloo, Netherlands
Brouw, W. N., (författare)
University of Groningen, Groningen, Netherlands, Netherlands Institute for Radio Astronomy (ASTRON), Dwingeloo, Netherlands
Brüggen, M., (författare)
Universität Hamburg, Hamburg, Germany
Ciardi, B., (författare)
Max Planck Society for the Advancement of Science (MPG), Bonn, Germany
Corstanje, A., (författare)
Radboud University, Nijmegen, Netherlands
De Gasperin, F., (författare)
Leiden University (UL), Leiden, Netherlands
de Geus, E., (författare)
SmarterVision BV, Assen, Netherlands, Netherlands Institute for Radio Astronomy (ASTRON), Dwingeloo, Netherlands
Eisloffel, J., (författare)
Max Planck Society for the Advancement of Science (MPG), Bonn, Germany
Engels, D., (författare)
Universität Hamburg, Hamburg, Germany
Falcke, H., (författare)
Radboud University, Nijmegen, Netherlands, Netherlands Institute for Radio Astronomy (ASTRON), Dwingeloo, Netherlands
Garrett, M. A., (författare)
Netherlands Institute for Radio Astronomy (ASTRON), Dwingeloo, Netherlands, Leiden University (UL), Leiden, Netherlands
Griessmeier, J. M., (författare)
Universite d'Orleans, Orleans, France, Universite d'Orleans, Orleans, France
Gunst, A. W., (författare)
Netherlands Institute for Radio Astronomy (ASTRON), Dwingeloo, Netherlands
van Haarlem, M. P., (författare)
Netherlands Institute for Radio Astronomy (ASTRON), Dwingeloo, Netherlands
Heald, G., (författare)
Netherlands Institute for Radio Astronomy (ASTRON), Dwingeloo, Netherlands, University of Groningen, Groningen, Netherlands, CSIRO Astronomy and Space Science, Perth, Australia
Hoeft, M., (författare)
Tháringer Landessternwarte Tautenburg, Camburg, Germany
Horandel, J., (författare)
Radboud University, Nijmegen, Netherlands
Horneffer, A., (författare)
Max Planck Society for the Advancement of Science (MPG), Bonn, Germany
Intema, H., (författare)
Leiden University (UL), Leiden, Netherlands, National Radio Astronomy Observatory Socorro, Socorro, United States
Juette, E., (författare)
Ruhr-Universität Bochum, Bochum, Germany
Kuniyoshi, M., (författare)
National Astronomical Observatory of Japan, Tokyo, Japan
van Leeuwen, J., (författare)
Netherlands Institute for Radio Astronomy (ASTRON), Dwingeloo, Netherlands, University of Amsterdam, Amsterdam, Netherlands
Loose, G. M., (författare)
Netherlands Institute for Radio Astronomy (ASTRON), Dwingeloo, Netherlands
Maat, P., (författare)
Netherlands Institute for Radio Astronomy (ASTRON), Dwingeloo, Netherlands
McFadden, R., (författare)
Netherlands Institute for Radio Astronomy (ASTRON), Dwingeloo, Netherlands
McKay-Bukowski, D., (författare)
Sodankyla Geophysical Observatory, Sodankyla, Finland, Rutherford Appleton Laboratory, United Kingdom
McKean, J. P., (författare)
Netherlands Institute for Radio Astronomy (ASTRON), Dwingeloo, Netherlands, University of Groningen, Groningen, Netherlands
Mulcahy, D. D., (författare)
University of Manchester, Manchester, United Kingdom
Munk, H., (författare)
Radboud University, Nijmegen, Netherlands, Netherlands Institute for Radio Astronomy (ASTRON), Dwingeloo, Netherlands
Pandey-Pommier, M., (författare)
Observatoire de Lyon, Saint-Genis-Laval, France
Polatidis, A. G., (författare)
Netherlands Institute for Radio Astronomy (ASTRON), Dwingeloo, Netherlands
Reich, W., (författare)
Max Planck Society for the Advancement of Science (MPG), Bonn, Germany
Rottgering, H., (författare)
Leiden University (UL), Leiden, Netherlands
Rowlinson, A., (författare)
Netherlands Institute for Radio Astronomy (ASTRON), Dwingeloo, Netherlands, University of Amsterdam, Amsterdam, Netherlands
Scaife, A. M. M., (författare)
University of Manchester, Manchester, United Kingdom
Schwarz, D. J., (författare)
Bielefeld University, Bielefeld, Germany
Steinmetz, M., (författare)
Astrophysikalisches Institut Potsdam, Potsdam, Germany
Swinbank, J., (författare)
Princeton University, Princeton, United States
Thoudam, S., (författare)
Radboud University, Nijmegen, Netherlands
Toribio, M. C., (författare)
Netherlands Institute for Radio Astronomy (ASTRON), Dwingeloo, Netherlands, Leiden University (UL), Leiden, Netherlands
Vermeulen, R., (författare)
Netherlands Institute for Radio Astronomy (ASTRON), Dwingeloo, Netherlands
Vocks, C., (författare)
Astrophysikalisches Institut Potsdam, Potsdam, Germany
van Weeren, R. J., (författare)
Harvard-Smithsonian Center for Astrophysics, Cambridge, United States
Wise, M. W., (författare)
University of Amsterdam, Amsterdam, Netherlands, Netherlands Institute for Radio Astronomy (ASTRON), Dwingeloo, Netherlands
Yatawatta, S., (författare)
Netherlands Institute for Radio Astronomy (ASTRON), Dwingeloo, Netherlands
Zarka, P., (författare)
LESIA - Laboratoire d'Etudes Spatiales et d'Instrumentation en Astrophysique, Meudon, France
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2016
Engelska.
Ingår i: Astronomy and Astrophysics. - 0004-6361. ; 595, s. Art no A86
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  • Tidskriftsartikel (refereegranskat)
Abstract Ämnesord
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  • We outline the LOFAR Long-Baseline Calibrator Survey (LBCS), whose aim is to identify sources suitable for calibrating the highest-resolution observations made with the International LOFAR Telescope, which include baselines > 1000 km. Suitable sources must contain significant correlated flux density (greater than or similar to 50 - 100 mJy) at frequencies around 110-190 MHz on scales of a few hundred milliarcseconds. At least for the 200-300-km international baselines, we find around 1 suitable calibrator source per square degree over a large part of the northern sky, in agreement with previous work. This should allow a randomly selected target to be successfully phase calibrated on the international baselines in over 50% of cases. Products of the survey include calibrator source lists and fringe-rate and delay maps of wide areas-typically a few degrees-around each source. The density of sources with significant correlated flux declines noticeably with baseline length over the range 200-600 km, with good calibrators on the longest baselines appearing only at the rate of 0.5 per sq. deg. Coherence times decrease from 1-3 min on 200-km baselines to about 1 min on 600-km baselines, suggesting that ionospheric phase variations contain components with scales of a few hundred kilometres. The longest median coherence time, at just over 3 min, is seen on the DE609 baseline, which at 227 km is close to being the shortest. We see median coherence times of between 80 and 110 s on the four longest baselines (580-600 km), and about 2 min for the other baselines. The success of phase transfer from calibrator to target is shown to be influenced by distance, in a manner that suggests a coherence patch at 150-MHz of the order of 1 deg. Although source structures cannot be measured in these observations, we deduce that phase transfer is affected if the calibrator source structure is not known. We give suggestions for calibration strategies and choice of calibrator sources, and describe the access to the online catalogue and data products.

Ämnesord

NATURVETENSKAP  -- Fysik -- Astronomi, astrofysik och kosmologi (hsv//swe)
NATURAL SCIENCES  -- Physical Sciences -- Astronomy, Astrophysics and Cosmology (hsv//eng)

Nyckelord

radio continuum: galaxies
galaxies: active
instrumentation: interferometers
techniques: interferometric
surveys

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