Broad-band spectral analysis of LMXB 2S 0921-63 with Suzaku. Issue 1 (24th September 2022)

• Record Type: Journal Article
• Authors: Sharma, Prince; Jain, Chetana; Dutta, Anjan
• Is Part Of: Monthly notices of the Royal Astronomical Society. Volume 517:Issue 1(2022)
• Page Start: 825
• Page End: 831
• Publication Date: 2022-09-24
• Subjects: binaries: eclipsing -- stars: neutron -- X-rays: binaries -- X-rays: individual: 2S 0921-63; Astronomy -- Periodicals; Periodicals; 520.5
• DOI: 10.1093/mnras/stac2698
• Languages: English
• ISSNs: 0035-8711

Abstract

ABSTRACT: We present the broad-band spectral analysis of the low-mass X-ray binary 2S 0921-63 by using the Suzaku archival data covering the orbital phase between 0.31 and 1.16 during four close observations. It is the first time that a broad-band spectral analysis of 2S 0921-63 has been done up to 25 keV. The 0.5–10 keV XIS count rate varied between ∼1 and ∼5 counts s −1 during the observations. A partial X-ray eclipse and broad post-eclipse intensity dip were observed during the observations. The X-ray emission hardened marginally during the intensity dip. We have modelled the source spectra by simultaneously fitting the XIS and HXD-PIN spectra for each of the four observations. The broad-band spectra of the source can be described by a model comprising a very hot blackbody having temperature, kT BB ≈ 1.66–2.13 keV, a high-energy cut-off power law, and an Fe emission line at E line ∼ 6.7 keV. A second model, accounting for the Comptonization of the thermal emission from accretion disc along with an Fe emission line, describes the broad-band spectra of 2S 0921-63 equally well.