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Dust extinctions for an unbiased sample of gamma-ray burst afterglows

文献类型:期刊论文

AuthorCovino, S.1; Melandri, A.1; Salvaterra, R.2; Campana, S.1; Vergani, S. D.1,3; Bernardini, M. G.1; D'Avanzo, P.1; D'Elia, V.4,5; Fugazza, D.1; Ghirlanda, G.1
SourceMONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
Issued Date2013-06-01
Volume432Issue:2Pages:1231-1244
Keywordgamma-ray burst: general ISM: general
English AbstractIn this paper, we compute rest-frame extinctions for the afterglows of a sample of Swift gamma-ray bursts (GRBs) complete in redshift. The selection criteria of the sample are based on observational high-energy parameters of the prompt emission and therefore our sample should not be biased against dusty sight-lines. It is therefore expected that our inferences hold for the general population of GRBs. Our main result is that the optical/near-infrared extinction of GRB afterglows in our sample does not follow a single distribution. 87 per cent of the events are absorbed by less than 2 mag, and 50 per cent suffer from less than 0.3-0.4 mag extinction. The remaining 13 per cent of the afterglows are highly absorbed. The true percentage of GRB afterglows showing high absorption could be even higher since a fair fraction of the events without reliable redshift measurement are probably part of this class. These events may be due to highly dusty molecular clouds/star-forming regions associated with the GRB progenitor or along the afterglow line of sight, and/or due to massive dusty host galaxies. No clear evolution in the dust extinction properties is evident within the redshift range of our sample, although the largest extinctions are at z similar to 1.5-2, close to the expected peak of the star formation rate. Those events classified as dark are characterized, on average, by a higher extinction than typical events in the sample. A correlation between optical/near-infrared extinction and hydrogen-equivalent column density based on X-ray studies is shown, although the observed N-H appears to be well in excess compared to those observed in the Local Group. Dust extinction does not seem to correlate with GRB energetics or luminosity.
WOS HeadingsScience & Technology ; Physical Sciences
WOS SubjectAstronomy & Astrophysics
WOS Subject ExtendedAstronomy & Astrophysics
WOS Keyword PlusTIME-DEPENDENT PHOTOIONIZATION ; GRB OPTICAL AFTERGLOWS ; X-RAY ; SWIFT-ERA ; HOST GALAXIES ; PANCHROMATIC OBSERVATIONS ; COLUMN DENSITIES ; PROMPT EMISSION ; MOLECULAR CLOUD ; STAR-FORMATION
Indexed TypeSCI
Language英语
WOS IDWOS:000319832300028
Available Date2014-01-20
源URL[http://libir.pmo.ac.cn/handle/332002/10044]  
Collection紫金山天文台_宇宙伽马暴、中子星及相关物理研究团组
Affiliation1.INAF Brera Astron Observ, I-23807 Merate, LC, Italy
2.INAF IASF Milano, I-20133 Milan, Italy
3.Univ Paris Diderot, CNRS, Observ Paris, GEPI, F-92190 Meudon, France
4.INAF Rome Astron Observ, I-00040 Rome, Italy
5.ASI Sci Data Ctr, I-00044 Rome, Italy
6.Univ Ljubljana, Fac Math & Phys, Ljubljana 1000, Slovenia
7.Ctr Excellence Space Si, Ljubljana 1000, Slovenia
8.Chinese Acad Sci, Purple Mt Observ, Nanjing 210008, Peoples R China
9.Univ Copenhagen, Niels Bohr Inst, Dark Cosmol Ctr, DK-2100 Copenhagen, Denmark
10.Univ Paris Diderot, APC, CNRS IN2P3, CEA Irfu,Obs Paris, Sorbonne Paris Cite, France
Recommended Citation
GB/T 7714
Covino, S.,Melandri, A.,Salvaterra, R.,et al. Dust extinctions for an unbiased sample of gamma-ray burst afterglows[J]. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,2013,432(2):1231-1244.
APA Covino, S..,Melandri, A..,Salvaterra, R..,Campana, S..,Vergani, S. D..,...&Tagliaferri, G..(2013).Dust extinctions for an unbiased sample of gamma-ray burst afterglows.MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,432(2),1231-1244.
MLA Covino, S.,et al."Dust extinctions for an unbiased sample of gamma-ray burst afterglows".MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 432.2(2013):1231-1244.

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来源:紫金山天文台

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