Do RadioAstron detections correlate with flaring states? An initial study of seven southern AGN |
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| Institution: | 1. CSIRO Astronomy and Space Science, PO Box 76, Epping, NSW 1710, Australia;2. Astro Space Center of Lebedev Physical Institute, Profsoyuznaya St. 84/32, 117997 Moscow, Russia;3. Institute of Physics and Technology, Dolgoprudny, Institutsky per., 9, Moscow region 141700, Russia;4. Max-Planck-Institut für Radioastronomie, Auf dem Hügel 69, 53121 Bonn, Germany;5. Sternberg Astronomical Institute, Moscow State University, Universitetskii pr. 13, 119992 Moscow, Russia;6. Department of Physics and Astronomy, Michigan State University, East Lansing, 48824 Michigan, USA;7. School of Physical Sciences, University of Tasmania, Private Bag 37, Hobart, TAS 7001, Australia;8. SARAO, Hartebeesthoek Radio Astronomy Observatory, Krugersdorp 1740, South Africa;9. NASA, Goddard Space Flight Center, Greenbelt, MD 20771, USA;10. Catholic University of America, Washington, DC 20064, USA |
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| Abstract: | We examine the state of seven southern radio sources at the time of their RadioAstron AGN Survey observations. Both ATCA flux density monitoring data and Fermi light-curves are considered in determining the relative activity of the source. A simple hypothesis, that sufficiently compact source structure exists for detections on RadioAstron baselines when the source is in a flaring state, is qualitatively tested. We find four instances of RadioAstron detections during flaring radio states and four instances of RadioAstron non-detections during fading or quiescent radio states, in support of the hypothesis. However, we also find three instances of RadioAstron detections during quiescent or fading radio states, and two non-detections during a flaring state, indicating that the situation is (not unexpectedly) more complex. Radio and gamma-ray monitoring such as that described here, together with the full RadioAstron AGN Survey results, will allow a more thorough investigation of the dependencies of detections on baselines of >10 Earth diameters. |
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| Keywords: | Extragalactic objects Space VLBI |
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