Exploring the radial disc ionization profile of the black hole X-ray binary GRS 1915+105. Issue 1 (13th December 2019)

• Record Type: Journal Article
• Authors: Shreeram, Soumya; Ingram, Adam
• Is Part Of: Monthly notices of the Royal Astronomical Society. Volume 492:Issue 1(2020)
• Page Start: 405
• Page End: 412
• Publication Date: 2019-12-13
• Subjects: black hole physics -- X-rays: binaries -- X-rays: individual: GRS 1915+105; Astronomy -- Periodicals; Periodicals; 520.5
• DOI: 10.1093/mnras/stz3455
• Languages: English
• ISSNs: 0035-8711

Abstract

ABSTRACT: Accreting black holes show characteristic 'reflection' features in their X-ray spectra, including the iron K α fluorescence line, which result from X-rays radiated by a compact central corona being reprocessed in the accretion disc atmosphere. The observed line profile is distorted by relativistic effects, providing a diagnostic for disc geometry. Nearly all previous X-ray reflection spectroscopy studies have made the simplifying assumption that the disc ionization state is independent of radius in order to calculate the rest-frame reflection spectrum. However, this is unlikely to be the case in reality, since the irradiating flux should drop off steeply with radius. Here, we analyse a Nuclear Spectroscopic Telescope Array observation of GRS 1915+105 that exhibits strong reflection features. We find that using a self-consistently calculated radial ionization profile returns a better fit than assuming constant ionization. Our results are consistent with the inner disc being radiation-pressure dominated, as is expected from the high inferred accretion rate for this observation. We also find that the assumed ionization profile impacts on the best-fitting disc inner radius. This implies that the black hole spin values previously inferred for active galactic nuclei and X-ray binaries by equating the disc inner radius with the innermost stable circular orbit may be changed significantly by the inclusion of a self-consistent ionization profile.