Is IGR J17091-3624 a Missing Link between GRS 1915+105 and other Black Hole Low Mass X-ray Binaries?

Details Is IGR J17091-3624 a Missing Link between GRS 1915+105 and other Black Hole Low Mass X-ray Binaries? Is IGR J17091-3624 a Missing Link between GRS 1915+105 and other Black Hole Low Mass X-ray Binaries?

2011-05-24

arxiv.org/abs/1105.4694v1

Astronomy and Astrophysics

Astrophysics

High Energy Astrophysical Phenomena

35 pages, 9 figures, 5 tables, submitted to ApJ

Scientific paper

In this work, we study the timing and spectral evolution of the transient low mass X-ray binary IGR J17091-3624 during its recent outburst. We present the results obtained from the observations with two instruments, Rossi X-ray Timing Explorer (RXTE)/ proportional counter array (PCA) and SWIFT/X-ray telescope (XRT), between 03 February 2011 and 10 April 2011. Apart from the detection of X-ray softening within the SWIFT/XRT energy range, we report the details of a transition from a low irregular variability state, commonly seen from most of the black hole X-ray binaries (BHXBs), to a regular, repetitive and large variability state, seen only from GRS 1915+105 ('rho' class variability). Several evidences such as similarities with GRS 1915+105, power-law dominating spectra, finding of type-B and type-C QPOs indicate that central object is a black hole candidate. Using scaling methods under crude approximations, we estimate the upper limit of the mass of the black hole to be 9.13 +/- 2.25 Msun and its distance to be 20.05 +/- 5.67 kpc. By comparing the timing and spectral properties of IGR J17091-3624 with those of the 'rho' class of GRS 1915+105, we conclude that till now the former is the only source, which behaved like GRS 1915+105, and could be used as a missing link between GRS 1915+105 and other canonical BHXBs in understanding their accretion and radiation mechanisms.

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