Negative feedback effects on star formation history and cosmic reionization

doi:10.1051/0004-6361/200809916

YNAO OpenIR > 高能天体物理研究组

	Negative feedback effects on star formation history and cosmic reionization
	Wang, L 1; Mao JR(毛基荣)2 ; Xiang, S 1; Yuan, YF 1; Wang, L (reprint author), Univ Sci & Technol China, Ctr Astrophys, Hefei 230026, Peoples R China.
发表期刊	ASTRONOMY & ASTROPHYSICS
	2009-02
卷号	494 期号:3 页码:817-827
DOI	10.1051/0004-6361/200809916
产权排序	第2完成单位
收录类别	SCI ; EI
关键词	Methods: Analytical Cosmology: Theory Galaxy: Evolution Stars: Formation
摘要	Context. The mechanical and radiative feedback that exists in the star formation history affects the subsequent star formation rate. Aims. After considering the effects of negative feedback on the process of star formation, we explore the relationship between star formation process and the associated feedback, by investigating how the mechanical feedback from supernovae(SNe) and radiative feedback from luminous objects regulate the star formation rate and therefore affect the cosmic reionization. Methods. Based on our present knowledge of the negative feedback theory and some numerical simulations, we construct an analytic model in the framework of the Lambda cold dark matter model. In certain parameter regions, our model can explain some observational results properly. Results. In large halos (T(vir) > 10(4) K), both mechanical and radiative feedback have a similar behavior: the relative strength of negative feedback reduces as the redshift decreases. In contrast, in small halos (T(vir) < 10(4) K) that are thought to breed the first stars at early time, the radiative feedback gets stronger when the redshift decreases. And the star formation rate in these small halos depends very weakly on the star-formation efficiency. Conclusions. Our results show that the radiative feedback is important for the early generation stars. It can suppress the star formation rate considerably. But the mechanical feedback from the SNe explosions is not able to affect the early star formation significantly. The early star formation in small-halo objects is likely to be self-regulated. The radiative and mechanical feedback dominates the star formation rate of the PopII/I stars all along. The feedback from first generation stars is very strong and should not be neglected. However, their effects on the cosmic reionization are not significant, which results in a small contribution to the optical depth of Thomson scattering.
项目资助者	National Basic Research Program of China [2009CB824800] ; National Natural Science Foundation [10733010, 10673010, 10573016] ; Program for New Century Excellent Talents in University
语种	英语
学科领域	Astronomy & Astrophysics
文章类型	Article
ISSN	0004-6361
URL	查看原文
WOS记录号	WOS:000263315500004
WOS研究方向	Astronomy & Astrophysics
WOS类目	Astronomy & Astrophysics
关键词[WOS]	EXTRAGALACTIC BACKGROUND LIGHT ; 1ST COSMOLOGICAL OBJECTS ; GAMMA-RAY BURSTS ; POPULATION-III ; BLACK-HOLES ; GALAXY FORMATION ; RADIATIVE FEEDBACK ; REDSHIFT DISTRIBUTION ; SUPERNOVA EXPLOSIONS ; LUMINOSITY FUNCTIONS
引用统计	被引频次：3[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	http://ir.ynao.ac.cn/handle/114a53/4987
专题	高能天体物理研究组
通讯作者	Wang, L (reprint author), Univ Sci & Technol China, Ctr Astrophys, Hefei 230026, Peoples R China.
作者单位	1.Center for Astrophysics, University of Science and Technology of China, Hefei, 230026, PR China 2.Yunnan Observatory, National Astronomical Observatories, Chinese Academy of Sciences, PO Box 110, Kunming, Yunnan Province, 650011, PR China
推荐引用方式 GB/T 7714	Wang, L,Mao JR,Xiang, S,et al. Negative feedback effects on star formation history and cosmic reionization[J]. ASTRONOMY & ASTROPHYSICS,2009,494(3):817-827.
APA	Wang, L,Mao JR,Xiang, S,Yuan, YF,&Wang, L .(2009).Negative feedback effects on star formation history and cosmic reionization.ASTRONOMY & ASTROPHYSICS,494(3),817-827.
MLA	Wang, L,et al."Negative feedback effects on star formation history and cosmic reionization".ASTRONOMY & ASTROPHYSICS 494.3(2009):817-827.

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