GRB afterglows: Dust extinction properties from the low to high redshift universe

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• 作者：Tayyaba Zafar^a ; ^b ; ^{tayyaba.zafar@aao.gov.au}
• 关键词：Interstellar dust
• 刊名：Planetary and Space Science
• 出版年：2016
• 出版时间：15 November 2016
• 年：2016
• 卷：133
• 期：Complete
• 页码：14-16
• 全文大小：367 K
• 卷排序：133

文摘

Long GRBs, associated with the death of massive stars, have power-law spectra, and occur up to the epoch of reionization. These advantages make GRBs potentially unique and effective probes to study dust extinction over broad range of redshifts. This work constitutes X-ray to optical spectroscopic spectral energy distributions of GRBs to determine the dust extinction. The 2175Å bump is also seen in GRBs suggesting diverse environments from young, low-mass to the evolved, massive galaxies. Various dust laws hints grains varying from silicates to carbonaceous. A decrease in dust content at high redshift is seen.