The X-ray absorbing column density of a complete sample of bright Swift gamma-ray bursts

被引：78

作者：

Campana, S. ^{[1
]}

Salvaterra, R. ^{[2
]}

Melandri, A. ^{[1
]}

Vergani, S. D. ^{[1
]}

Covino, S. ^{[1
]}

D'Avanzo, P. ^{[1
]}

Fugazza, D. ^{[1
]}

Ghisellini, G. ^{[1
]}

Sbarufatti, B. ^{[1
]}

Tagliaferri, G. ^{[1
]}

机构：

[1] INAF Osservatorio Astron Brera, I-23807 Merate, LC, Italy

[2] INAF IASF Milano, I-20133 Milan, Italy

来源：

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY | 2012年 / 421卷 / 02期

关键词：

gamma-ray burst: general; X-rays: general; X-rays: ISM; LYMAN LIMIT SYSTEMS; MOLECULAR CLOUD; HOST GALAXIES; OPTICAL AFTERGLOW; EXTINCTION CURVES; MGII ABSORBERS; ALPHA SYSTEMS; DARK BURSTS; DUST; SIGHT;

D O I：

10.1111/j.1365-2966.2012.20428.x

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

A complete sample of bright Swift gamma-ray bursts (GRBs) have been recently selected by Salvaterra et al. The sample has a high level of completeness in redshift (90 per cent). We derive here the intrinsic absorbing X-ray column densities of these GRBs making use of the Swift/X-ray Telescope data. This distribution has a mean value of log (N-H/cm(-2)) = 21.7 +/- 0.5. This value is consistent with the distribution of the column densities derived from the total sample of GRBs with redshift. We find a mild increase in the intrinsic column density with redshift. This can be interpreted as due to the contribution of intervening systems along the line of sight. Making use of the spectral index connecting optical and X-ray fluxes at 11 h (beta(OX)), we investigate the relation between the intrinsic column density and the GRB 'darkness'. We find that there is a very tight correlation between dark GRBs and high X-ray column densities. This clearly indicates that the dark GRBs are formed in a metal-rich environment where dust must be present.

引用

页码：1697 / 1702

页数：6

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