Multirange study of the radio sources of the RATAN-600 surveys
O.P. Zhelenkova, E.K. Majorova
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Abstract
We present the results of the search of variable sources and transient events in the
archive data of the sky surveys conducted on 3.9 GHz on the RATAN-600 radio telescope of the
Special Astrophysical Observatory of the Russian Academy of Sciences (SAO RAS) in
1980-2000. 17% of the total studied sources can be attributed to the long-term variables in radio
range. About half of them has significant variations in optical brightness according to the data of
the optical and infra-red catalogs. Variability in the radio range is accompanied by variability in
the optical range for the quite bright host objects (R < 18m).
At a level of 3-5 r.m.s. we found three transient events. Using the data from radio and optical
surveys and VizieR, SIMBAD, and NED databases, we made assumptions on the possible nature
of these events. The first transient is probably associated with AGN activity, the second one –
with a cataclysmic GRB event or with a supernova, the origin of the third is not determined. The
inference on the possibility of search for variable sources and transients using the data from the
RATAN-600 blind surveys was drawn. According to our estimation the surface density of radio
transients is 0.03 on one square angular degree with the detection level 8-11 mJy on 3.94 GHz.
Reference:
O.P. Zhelenkova, E.K. Majorova,
"Multirange study of the radio sources of the RATAN-600 surveys"
in Proceedings of The International Conference
"SN 1987A, Quark Phase Transition in Compact Objects
and Multimessenger Astronomy",
Russia, Terskol (BNO INR RAS), Nizhnij Arkhyz (SAO RAS), 2-8 July 2017,
INR RAS, Moscow, 2018, ISBN 978-5-94274-327-7, pp. 247-257.
DOI: 10.26119/SAO.2020.1.52366
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