SIMBAD references

2013ApJ...776...96W - Astrophys. J., 776, 96 (2013/October-3)

Evidence of contribution of intervening clouds to gamma-ray burst's X-ray column density.


Abstract (from CDS):

The origin of excess of X-ray column density with respect to optical extinction in gamma-ray bursts (GRBs) is still a puzzle. A proposed explanation of the excess is the photoelectric absorption due to the intervening clouds along a GRB's line of sight. Here, we test this scenario by using the intervening Mg II absorption as a tracer of the neutral hydrogen column density of the intervening clouds. We identify a connection between the large X-ray column density (and large column density ratio of log(NH,X/NHI ∼0.5) and large neutral hydrogen column density probed by the Mg II doublet ratio (DR). In addition, GRBs with large X-ray column density (and large ratio of log(NH,X/NHI > 0) tend to have multiple saturated intervening absorbers with DR < 1.2. These results therefore indicate an additional contribution from the intervening system to the observed X-ray column density in some GRBs, although the contribution from the host galaxy alone cannot be excluded based on this study.

Abstract Copyright:

Journal keyword(s): gamma-ray burst: general - intergalactic medium - methods: statistical

Simbad objects: 30

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