AstroSat and Chandra view of the high soft state of 4U 1630-47 (4U 1630-472): evidence of the disk wind and a rapidly spinning black hole

Abstract

We present the X-ray spectral and timing analysis of the transient black hole X-ray binary 4U 1630-47, observed with the AstroSat, Chandra and MAXI space missions during its soft X-ray outburst in 2016. The outburst, from the rising phase until the peak, is neither detected in hard X-rays (15-50 keV) by the Swift/BAT nor in radio. Such non-detection along with the source behavior in the hardness-intensity and color-color diagrams obtained using MAXI data confirm that both Chandra and AstroSat observations were performed during the high soft spectral state. The High Energy Grating (HEG) spectrum from the Chandra high-energy transmission grating spectrometer (HETGS) shows two strong, moderately blueshifted absorption lines at 6.705${}_{-0.002}^{+0.002}$ keV and 6.974${}_{-0.003}^{+0.004}$ keV, which are produced by Fe XXV and Fe XXVI in a low-velocity ionized disk wind. The corresponding outflow velocity is determined to be 366$\pm$56 km/s. Separate spectral fits of Chandra/HEG, AstroSat/SXT+LAXPC and Chandra/HEG + AstroSat/SXT+LAXPC data show that the broadband continuum can be well described with a relativistic disk-blackbody model, with the disk flux fraction of $\sim 0.97$. Based on the best-fit continuum spectral modeling of Chandra, AstroSat and Chandra+AstroSat joint spectra and using the Markov Chain Monte Carlo simulations, we constrain the spectral hardening factor at 1.56${}_{-0.06}^{+0.14}$ and the dimensionless black hole spin parameter at 0.92 $\pm$ 0.04 within the 99.7% confidence interval. Our conclusion of a rapidly-spinning black hole in 4U 1630-47 using the continuum spectrum method is in agreement with a previous finding applying the reflection spectral fitting method.

arXiv comment14 pages, 8 figures, 1 table, accepted for publication in the Astrophysical Journal

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• A Systematic View of Ten New Black Hole Spins
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• AstroSat and MAXI view of the Black Hole binary 4U 1630-472 during 2016 and 2018 Outbursts
• Black Hole Spin in X-ray Binaries: Giving Uncertainties an $f$
• A Comprehensive Chandra Study of the Disk Wind in the Black Hole Candidate 4U 1630-472
• IXPE and NICER view of Black hole X-ray binary 4U 1630-47: First significant detection of polarized emission in thermal state
• The spins of the Galactic black holes in MAXI J1535-571 and 4U 1630-472 from Insight-HXMT
• Spectropolarimetric study of 4U 1630$-$47 in Steep Power law state with IXPE and NICER
• An Insight-HXMT view of the mHz quasi-regular modulation phenomenon in the black hole X-ray binary 4U 1630-47
• Science with the $AstroSat$ Soft X-ray Telescope: an overview
• Revisiting the galactic X-ray binary MAXI J1631-479: Implications for high inclination and a massive black hole
• The spin measurement of MAXI J1348-630 using the Insight-HXMT data
• Accretion disc winds in X-ray binaries
• Evidence of mutually exclusive outflow forms from a black hole X-ray binary
• Spectro-temporal Investigation of Quasi-periodic Oscillations From Black Hole X-ray Binary 4U 1630-472 Using $\text{NICER}$
• LAXPC instrument onboard AstroSat: Five exciting years of new scientific results specially on X-ray Binaries
• 20 years of disk winds in 4U 1630-47 -- I. Long-term behavior and influence of hard X-rays
• NICER Spectral and Timing Analysis of 4U 1630$-$47 and its Heartbeat State
• On the origin of core radio emissions from black hole sources in the realm of relativistic shocked accretion flow
• On a Class of Exact Arbitrarily Differentiable de Sitter Cores with Kerr Exteriors: Possible gravastar or regular black hole mimickers