The two INTEGRAL X-ray transients IGR J17091--3624 and IGR J17098--3628: a multi-wavelength long term campaign

Abstract

IGR J17091-3624 and IGR J17098-3628 are two X-ray transients discovered by INTEGRAL and classified as possible black hole candidates (BHCs). We present here the results obtained from the analysis of multi-wavelength data sets collected by different instruments from 2005 until the end of 2007 on both sources. IGR J17098-3628 has been regularly detected by INTEGRAL and RXTE over the entire period of the observational campaign; it was also observed with pointed observations by XMM and Swift/XRT in 2005 and 2006 and exhibited flux variations not linked with the change of any particular spectral features. IGR J17091-3624 was initially in quiescence (after a period of activity between 2003 April and 2004 April) and it was then detected again in outburst in the XRT field of view during a Swift observation of IGR J17098--3628 on 2007 July 9. The observations during quiescence provide an upper limit to the 0.2-10 keV luminosity, while the observations in outburst cover the transition from the hard to the soft state. Moreover, we obtain a refined X-ray position for IGR J17091-3624 from the Swift/XRT observations during the outburst in 2007. The new position is inconsistent with the previously proposed radio counterpart. We identify in VLA archive data a compact radio source consistent with the new X-ray position and propose it as the radio counterpart of the X-ray transient.

Accepted for publication in ApJ

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Cited by in corpus (18)

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• WATCHDOG: A Comprehensive All-Sky Database of Galactic Black Hole X-ray Binaries
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• Discovery of high-frequency quasi-periodic oscillations in the black-hole candidate IGR J17091-3624
• Low-Mass X-ray Binaries
• Modified viscosity in accretion disks. Application to Galactic black hole binaries, intermediate mass black holes and AGN
• Why is IGR J17091-3624 so faint? Constraints on distance, mass, and spin from `phase-resolved' spectroscopy of the `heartbeat' oscillations
• The peculiar 2011 outburst of the black hole candidate IGR J17091-3624, a GRS 1915+105 like source?
• Interplay between heartbeat oscillations and wind outflow in microquasar IGR J17091-3624
• The INTEGRAL view on Black Hole X-ray Binaries
• First simultaneous multi-wavelength observations of the black hole candidate IGR J17091-3624: ATCA, INTEGRAL, Swift, and RXTE views of the 2011 outburst
• Chandra observations of five INTEGRAL sources: new X-ray positions for IGR J16393-4643 and IGR J17091-3624
• X-ray spectral state evolution in IGR J17091-3624 and comparison of its heartbeat oscillation properties with those of GRS 1915+105
• The reflection component in the average and heartbeat spectra of the black-hole candidate IGR J17091-3642 during the 2016 outburst
• AstroSat view of IGR J17091-3624 and GRS 1915+105: decoding the 'pulse' in the 'Heartbeat State'
• The enigmatic black-hole candidate and X-ray transient IGR J17091-3624 in its quiescent state as seen with XMM-Newton
• Discovery of long-term superorbital periodicities in the pseudo-transient LMXBs: IGR J17098-3628 and EXO0748-676