Multiwavelength observations of the black hole transient XTE J1752-223 during its 2010 outburst decay

Abstract

Galactic black hole transients show many interesting phenomena during outburst decays. We present simultaneous X-ray (RXTE, Swift, and INTEGRAL), and optical/near-infrared (O/NIR) observations (SMARTS) of the X-ray transient XTE J1752-223 during its outburst decay in 2010. The multiwavelength observations over 150 days in 2010 cover the transition from soft to hard spectral state. We discuss the evolution of radio emission is with respect to the O/NIR light curve which shows several flares. One of those flares is bright and long, starting about 60 days after the transition in X-ray timing properties. During this flare, the radio spectral index becomes harder. Other smaller flares occur along with the X-ray timing transition, and also right after the detection of the radio core. We discuss the significances of these flares. Furthermore, using the simultaneous broadband X-ray spectra including INTEGRAL, we find that a high energy cut-off with a folding energy near 250 keV is necessary around the time that the compact jet is forming. The broad band spectrum can be fitted equally well with a Comptonization model. In addition, using photoelectric absorption edges in the XMM-Newton RGS X-ray spectra and the extinction of red clump giants in the direction of the source, we find a lower limit on the distance of > 5 kpc.

14 pages, 15 figures

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• The INTEGRAL view on Black Hole X-ray Binaries
• A Delayed Transition to the Hard State for 4U 1630-47 at the End of Its 2010 Outburst
• The appearance of a compact jet in the soft-intermediate state of 4U 1543-47
• The radio/X-ray correlation in X-ray binaries - Insights from a hard X-ray perspective
• The Galactic LMXB Population and the Galactic Centre Region
• Complete Multiwavelength Evolution of Galactic Black Hole Transients During Outburst Decay II: Compact Jets and X-ray Variability Properties
• Multiwavelength observations of MAXI J1820+070 during its outburst decay and subsequent mini-outburst
• Inclination effects on the X-ray emission of Galactic black-hole binaries
• Multiwavelength observations of the black hole transient Swift J1745-26 during the outburst decay