Pontzen 2009 暴周的HI吸收体

主要内容:
文章是数值拟合.

(如果有结论的话, 可以用来知道暴周环境, 并进而推测前身星的演化.)

精彩摘抄:


文章信息:

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Title:		The nature of HI absorbers in GRB afterglows: clues from hydrodynamic simulations
Authors:		Pontzen, Andrew; Deason, Alis; Governato, Fabio; Pettini, Max; Wadsley, James; Quinn, Thomas;Brooks, Alyson; Bellovary, Jillian; Fynbo, Johan
Publication:		eprint arXiv:0909.1321
Publication Date:		09/2009
Origin:		ARXIV
Keywords:		Astrophysics - Cosmology and Extragalactic Astrophysics
Comment:		12 pages, 7 figures
Bibliographic Code:		2009arXiv0909.1321P

Abstract

In recent work, we have shown that it is possible to link quantitatively many aspects of damped Lyman alpha (DLA) absorbers in the spectra of quasars to high resolution simulations of galaxy formation. Using runs from the same series of hydrodynamic numerical studies, we consider the expected properties of Lyman alpha absorbers seen in the spectra of high redshift (z>2) gamma ray burst afterglows (GRB-DLAs). If GRBs are associated with the death of massive stars, their afterglows provide insights into otherwise unprobed regions of protogalactic objects, but detailed physical interpretations are currently embryonic. We find that median impact parameters (measured from the potential minimum) are approximately 1 kpc for GRBs compared with 4 kpc for QSO-DLAs. However, an equally important difference is that GRB-DLAs are predominantly associated with halos of mass 10^10 .lt. m_vir/m_sol .lt. 10^12, .gt. 10^19 cm^-2, but they somewhat underpredict the incidence of low column densities N_HI<10^19>

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