Follow-up ATCA radio observations of the black hole candidate Swift J174510.8-262411
ATel #4410; S. Corbel (Univ. Paris Diderot & CEA Saclay), P. Edwards, T. Tzioumis (ATNF), M. Coriat, R. Fender (Univ. Southampton) & C. Brocksopp (MSSL)
on 21 Sep 2012; 22:39 UT
Credential Certification: Mickael Coriat (mickael@coriat.eu)
Subjects: Radio, Binary, Black Hole, Transient
Following the discovery of Swift J174510.8-262411 (GCN #13774, GCN #13775, ATEL #4380) and the report of a radio counterpart (ATel # 4394), we have conducted radio observations with the Australia Telescope Compact Array on 2012 September, 19.
A bright radio source is detected at a position consistent with Swift J174510.8-26241 with preliminary flux densities of 13.2 +/- 0.20 mJy at 5.5 GHz and 13.5 +/- 0.20 mJy at 9.0 GHz, giving a spectral index of +0.05+/- 0.04. This radio spectral index during this ATCA observation clearly favours optically thick synchrotron emission from self-absorbed compact jets, which is fully consistent with the source being in the hard state at the time of the ATCA radio observations (e.g. ATel #4393).
A comparison with the radio observation on the previous day (ATel # 4394) indicates that the flux
densities have doubled in less than a day. Follow up radio observation are important to catch the
possible radio flare that could occur in the next days.
