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- Title
X-ray spectroscopy of the accretion disk corona source 2S 0921−630 with Suzaku archival data.
- Authors
Yoneyama, Tomokage; Dotani, Tadayasu
- Abstract
2S 0921−630 is an eclipsing low-mass X-ray binary (LMXB) with an orbital period of ∼9 d. Past X-ray observations have revealed that 2S 0921−630 has an extended accretion disk corona (ADC), from which most of the X-rays from the system are emitted. We report the result of our Suzaku archival data analysis of 2S 0921−630. The average X-ray spectrum is reproduced with a blackbody emission (kT bb ∼ 0.3 keV) Comptonized by optically thick gas ("Compton cloud"; optical depth τ ∼ 21) with a temperature of ∼2 keV, combined with 13 emission lines. We find that most of the emission lines correspond to highly ionized atoms: O, Ne, Mg, Si, S, Ar, and Fe. A Kα emission line and an absorption edge of semi-neutral iron (Fe textsci– textscxvii) are also detected. The semi-neutral iron Kα line is significantly broad, with a width of 0.11 ± 0.02 keV in sigma, which corresponds to the Doppler broadening by the Kepler motion at a radius of ∼109 cm. We suggest that the observed semi-neutral iron line originates at the inner part of the accretion disk in the immediate outside of the Compton cloud, i.e., the Compton cloud may have a radius of ∼109 cm.
- Subjects
COMPTON (Calif.); X-ray spectroscopy; KEPLER, Johannes, 1571-1630; IRON; DOPPLER broadening; X-ray binaries; X-rays; ACCRETION disks
- Publication
Publications of the Astronomical Society of Japan, 2023, Vol 75, Issue 1, p30
- ISSN
0004-6264
- Publication type
Article
- DOI
10.1093/pasj/psac086