Cosmological Evolution of the Absorption of ?-Ray Burst X-Ray Afterglows

被引：13

作者：

Rahin, Roi ^{[1
]}

Behar, Ehud ^{[1
]}

机构：

[1] Technion, Phys Dept, IL-32000 Haifa, Israel

来源：

ASTROPHYSICAL JOURNAL | 2019年 / 885卷 / 01期

关键词：

Warm-hot intergalactic medium; Gamma-ray bursts; X-ray transient sources; COMPLETE SAMPLE; COLUMN DENSITY; RADIATION;

D O I：

10.3847/1538-4357/ab3e34

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

X-ray absorption of ?-ray burst (GRB) afterglows is prevalent yet poorly understood. X-ray-derived neutral hydrogen column densities (N-H) of GRB X-ray afterglows show an increase with redshift, which might give a clue for the origin of this absorption. We use more than 350 X-ray afterglows with spectroscopic redshift (z) from the Swift X-ray Telescope repository as well as over 100 Ly? absorption measurements in z>1.6 sources. The observed trend of the average optical depth ? at 0.5 keV is consistent with both a sharp increase of host N-H(z), and an absorbing diffuse intergalactic medium (IGM), along with decreasing host contribution to ?. We analyze a subsample of high-z GRBs with N-H derived both from the X-ray afterglow and the Ly? line. The increase of X-ray-derived N-H(z) is contrasted by no such increase in the Ly?-derived column density. We argue that this discrepancy implies a lack of association between the X-ray and Ly? absorbers at high z. This points toward the X-ray absorption at high z being dominated by an intervening absorber, which lends credibility to an absorbing IGM contribution.

引用

页数：4

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