Determination of the mass of IGR J17091–3624 from “spectro-temporal” variations during the onset phase of the 2011 outburst
- Space Astronomy Group, SSIF/ISITE Campus, ISRO Satellite Centre, Outer Ring Road, Marathahalli, Bangalore, 560037 (India)
The 2011 outburst of the black hole candidate IGR J17091–3624 followed the canonical track of state transitions along with the evolution of quasi-periodic oscillation (QPO) frequencies before it began exhibiting various variability classes similar to GRS 1915+105. We use this canonical evolution of spectral and temporal properties to determine the mass of IGR J17091–3624, using three different methods: photon index (Γ)–QPO frequency (ν) correlation, QPO frequency (ν)–time (day) evolution, and broadband spectral modeling based on two-component advective flow (TCAF). We provide a combined mass estimate for the source using a naive Bayes based joint likelihood approach. This gives a probable mass range of 11.8 M{sub ⊙}−13.7 M{sub ⊙}. Considering each individual estimate and taking the lowermost and uppermost bounds among all three methods, we get a mass range of 8.7 M{sub ⊙}−15.6 M{sub ⊙} with 90% confidence. We discuss the possible implications of our findings in the context of two-component accretion flow.
- OSTI ID:
- 22882941
- Journal Information:
- Astrophysical Journal, Vol. 807, Issue 1; Other Information: Country of input: International Atomic Energy Agency (IAEA); Since 2009, the country of publication for this journal is the UK.; ISSN 0004-637X
- Country of Publication:
- United Kingdom
- Language:
- English
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