Is PKSB2258-022 a new Gamma-ray source ?
ATel #7480; S. A. Trushkin, J. V. Sotnikova, A. Erkenov (SAO RAS, Russia)
on 6 May 2015; 18:33 UT
Credential Certification: Sergei Trushkin (satr@sao.ru)
Subjects: Gamma Ray, AGN, Blazar, Quasar
After recent report about detection a strong gamma-ray source near the relative bright radio quasar PKS B2258-022 (ATEL #7445) we carried out a search for a possible candidate counterpart within radius of 12 arcmin around the gamma-ray source. Indeed the best candidate is PKS B2258-022,
variable, gigahertz-peaked source (GPS), as followed from its the Planck survey catalogue detection at 70, 143, and 217 GHz. Also it is monitoring during 2008-2014 in the Candidate Gamma-ray Blazar Sample (Healey at al.2008) at 15 GHz with the OVRO 40m telescope. It was varied from 1.3 to 0.33 Jy.
We have observed it with the RATAN-600 radio telescope in February 2005, March 2008 and April 2015
at 1.0, 2.3, 4.8, 8.2, 11.2 and 21.7 GHz. All multi-frequency measured spectra were inverted at the higher frequencies. But current fluxes are rather in minimum than in an active state. But we can expect that a gamma-ray flare could be appreciably before a following radio event. Just now the new Swift data are reported about PKS B2258-022 as the best counterpart of the new gamma-ray source (ATEL #7479). Below the measured radio spectra and measurements from the other catalogs, collected in the our CATS database (cats.sao.ru) are presented. We will continue the monitoring of the source.
The measured spectra (epochs: 2005, 2008, 2015) of PSK B2258-022
