Mao 2010 伽马暴宿主星系的理论分析
主要内容:
假设长暴来自于恒星形成中的宿主星系，根据星系的演化看对X射线和光学余辉的吸收，红移大的吸收大些，和Swift的观测相符。不能用于小红移，因为晚期有星系并合，单一星系演化模型不能用了。
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文章信息:
· Find Similar Abstracts (with default settings below) Title:
A Theoretical Investigation on the Gamma-ray Burst Host Galaxies Authors:
Mao, J. Publication:
eprint arXiv:1005.1876 Publication Date:
05/2010 Origin:
ARXIV Keywords:
Astrophysics - High Energy Astrophysical Phenomena, Astrophysics - Cosmology and Extragalactic Astrophysics Comment:
ApJ accepted, comments are welcome Bibliographic Code:
2010arXiv1005.1876M Abstract
Long-duration gamma-ray bursts(LGRBs) are believed to be linked with the star formation. We adopt a galactic evolution model, in which the star formation process inside the virialized dark halo at given redshift can be achieved. In this paper, the gamma-ray burst(GRB) host galaxies are assumed to be the star-forming galaxies within the small dark halos. The star formation rates(SFRs) in the host galaxies of LGRBs at different redshifts have been derived from our model with the galactic evolutionary time about a few times of $10^7$ yr and the dark halo mass of about $5\times 10^{11}M_\odot$. The related stellar masses, luminosities and metallicities of these hosts are estimated as well. We further calculate the X-ray and optical absorption of GRB afterglow emission. From our model calculation, at higher redshift, the SFR of host galaxy is larger, the absorption in X-ray band and optical band of GRB afterglow is stronger, in the condition that the dust and metal components are released locally, surrounding the GRB environment. These model predictions are compared with the {\it Swift} and other observational data. At lower redshift $z.lt.1$,Bibtex entry for this abstract Preferred format for this abstract (see Preferences)
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