Broadband spectral and emission geometry analysis of XB 1916–053 with Chandra and NuSTAR

IF 10.2 4区物理与天体物理 Q1 ASTRONOMY & ASTROPHYSICS

Journal of High Energy Astrophysics Pub Date : 2025-03-31 DOI:10.1016/j.jheap.2025.100376

Rahul Sharma

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引用次数: 0

Abstract

We report results from a broad-band spectral analysis of the dipping neutron star low-mass X-ray binary XB 1916–053 using the Chandra and Nuclear Spectroscopic Telescope Array (NuSTAR) observation. The spectrum can be well described with a combination of emission from a multi-colour disk (

k T_{in} \sim

0.7 keV), a single-temperature blackbody (

k T_{BB} \sim

1.4 keV), and thermal Comptonization components (

Γ \sim 1.9; k T_{e} \sim

17 keV), with the neutron star surface (or boundary layer) serving as the primary source of Comptonizing seed photons. The timing and spectral properties suggest that the source is in a soft state, albeit with a relatively high electron corona temperature. Additionally, absorption features were detected in the persistent spectrum from the highly ionized Si, S, Ar, Ca, Fe and a blend of highly ionized Fe Kβ and Ni Kα transitions. These features suggest the presence of a highly ionized atmosphere above the accretion disk during persistent intervals. During the dipping intervals, the line of sight is obscured by the outer disk structure or bulge, which is denser and less ionized.

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来源期刊

Journal of High Energy Astrophysics Earth and Planetary Sciences-Space and Planetary Science

CiteScore

9.70

自引率

5.30%

发文量

审稿时长

65 days

期刊介绍： The journal welcomes manuscripts on theoretical models, simulations, and observations of highly energetic astrophysical objects both in our Galaxy and beyond. Among those, black holes at all scales, neutron stars, pulsars and their nebula, binaries, novae and supernovae, their remnants, active galaxies, and clusters are just a few examples. The journal will consider research across the whole electromagnetic spectrum, as well as research using various messengers, such as gravitational waves or neutrinos. Effects of high-energy phenomena on cosmology and star-formation, results from dedicated surveys expanding the knowledge of extreme environments, and astrophysical implications of dark matter are also welcomed topics.