Kushwaha, A and Jayasurya, KM and Agrawal, VK and Nandi, A (2023) IXPE and NICER view of black hole X-ray binary 4U 1630-47: First significant detection of polarized emission in thermal state. In: Monthly Notices of the Royal Astronomical Society: Letters, 524 (1). L15-L20.
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We present a detailed spectro-polarimetric study of black hole X-ray binary 4U 1630-47 during its 2022 outburst with IXPE and NICER observations. The source is observed in disc dominated thermal state (kTin ≈ 1.4 keV) with clear detection of absorption features at 6.69 ± 0.01 keV and 6.97 ± 0.01 keV from both NICER as well as IXPE spectra, likely indicating a coupling of disc-wind. A significant degree of polarization (PD) and polarization angle (PA) =17.78° ± 0.60° in the energy range of 2 - 8 keV are measured with IXPE. PD is found to be an increasing function of energy whereas PA remains roughly same within the energy range. Simultaneous energy spectra from NICER in the range of 0.5 - 12 keV are modelled to study the spectral properties. Furthermore, the spin parameter of the black hole is estimated with spectro-polarimetric data as a which is corroborated by NICER observations. Finally, we discuss the implications of our findings.
| Item Type: | Journal Article |
|---|---|
| Publication: | Monthly Notices of the Royal Astronomical Society: Letters |
| Publisher: | Oxford University Press |
| Additional Information: | The copyright for this article belongs to the Oxford University Press. |
| Keywords: | accretion, accretion discs; black hole physics; polarization; radiation: dynamics; stars: individual: (4U 1630-47); techniques: polarimetric; X-rays: binaries |
| Department/Centre: | Division of Physical & Mathematical Sciences > Physics |
| Date Deposited: | 01 Aug 2023 05:07 |
| Last Modified: | 01 Aug 2023 05:07 |
| URI: | https://eprints.iisc.ac.in/id/eprint/82563 |
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