Significant Dust Scattering Effects for X-ray Sources in the Galactic Centre
Abstract
The Galactic Centre (GC) region contains many bright X-ray sources and has a high column density of foreground gas and dust. This suggests that X-ray dust scattering should be ubiquitous and intensive in the GC direction. In this presentation, I will report our recent major progress in discovering various significant effects of dust scattering for GC X-ray sources. As an example, I will show that X-ray dust scattering can severely bias the observed spectrum of the GC LMXB AX J1745.6-2901 at 1.45 arcmin away from Sgr A*, and explain its peculiar eclipse light curves. This study also allows us to put constraints on the GC foreground dust distribution , which indicate that most of the dust along the line-of-sight should reside in the Galactic disk rather than in the GC. I will also show that dust scattering halo is commonly observed around many GC sources, and so its spectral timing effects should be seriously considered for all these sources, including Sgr A*. Finally, I will introduce our Xspec models for the spectral correction of GC foreground dust scattering.
- Publication:
-
42nd COSPAR Scientific Assembly
- Pub Date:
- July 2018
- Bibcode:
- 2018cosp...42E1620J