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Radio activity in H1743-322

ATEL # 2062; James C.A. Miller-Jones (NRAO), Gregory R. Sivakoff (Virginia), Simone Migliari (ESA), Elmar Koerding (CEA Saclay), Michael P. Rupen (NRAO), Ronald A. Remillard (MIT), Vivek Dhawan (NRAO), David M. Russell (Amsterdam), Dipankar Maitra (Amsterdam), Rob P. Fender (Southampton), Sera Markoff (Amsterdam), Sebastian Heinz (Wisconsin-Madison), Craig L. Sarazin (Virginia), Tom J. Maccarone (Southampton)
on 28 May 2009; 18:34 UT
Password Certification: James C.A. Miller-Jones (

Subjects: Radio, X-ray, Request for Observations, Binaries, Black Holes, Transients

Following the detection of renewed activity in H1743-322 with Swift/BAT (Krimm et al., ATEL #2058), we triggered radio observations of the source using the VLA. Observations were taken on 2009 May 27 (0855-0915 UT) at 8.4 GHz, with the array in its CnB configuration. The source was detected at a level of 2.24 +/- 0.05 mJy. The uncertainty on the absolute flux density scale is of order 5%. The source is consistent with being unresolved to the beamsize of 3.3 x 2.2 arcseconds, oriented 35 degrees E of N.

The RXTE ASM confirms the brightening of H1743-322 during May 23-28, with a flux that appears to be leveling off today at 80 mCrab (1.5-12 keV), with hardness ratios consistent with the hard state of black hole binaries. From the measured fluxes, the source would appear to lie close to the radio/X-ray luminosity correlation (Gallo, Fender & Pooley, 2003), assuming a Galactic Center distance.

VLA and VLBA observations are ongoing. Further multiwavelength observations are encouraged.

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R. E. Rutledge , Editor
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