Radio detection of GS 1354-645 with the ATCA
ATel #7656; M. Coriat (IRAP), T. Tzioumis (ATNF), S. Corbel (Univ. Paris Diderot & CEA Saclay), R. Fender (Univ. Oxford), J. Miller-Jones (Curtin)
on 18 Jun 2015; 07:32 UT
Credential Certification: Mickael Coriat (mickael@coriat.eu)
Subjects: Radio, Black Hole, Transient
Referred to by ATel #: 7887
We report on radio observations of the black hole GS 1354-645, currently in outburst (Miller et al. ATel #7612, #7614; Corral-Santana et al. ATel #7620; Russell et al. ATel #7637). We observed on 2015 June 16 from 06:00 to 09:30 UT (MJD 57189.32) with the Australia Telescope Compact Array in 1.5C configuration. The source was detected with the following preliminary flux densities:
5.5 GHz: 1.55 +/- 0.02 mJy
9 GHz: 1.47 +/- 0.03 mJy
The spectral index alpha = -0.10 +/- 0.05 (S = k nu^+alpha) suggests synchrotron emission from self-absorbed compact jets, therefore consistent with the source being in the hard state. The lower limit of 25 kpc for the distance to GS 1354-645 (Casares et al. 2009) implies a 5GHz radio luminosity of 4.5E+29 erg/s. Using the X-ray flux on June 10 reported by Miller et al. (ATel #7614), the source clearly lies on the lower track of the radio/X-ray correlation using either the lower or the upper limit (61 kpc, Casares et al. 2009) for the distance.
Further radio observations with the ATCA are planned, we therefore strongly encourage monitoring at other wavelengths.
We are extremely grateful to Phil Edwards for the rapid scheduling of these observations.
References:
Casares et al. 2009, ApJS 181, 238
