Is the cosmic ultraviolet background fluctuating at redshift z similar or equal to 6?

CORC > 紫金山天文台 > 中国科学院紫金山天文台 > 毫米波和亚毫米波技术实验室

	Is the cosmic ultraviolet background fluctuating at redshift z similar or equal to 6?
	Liu, Jiren ; Bi, Hongguang ; Feng, Long-Long; Fang, Li-Zhi
刊名	ASTROPHYSICAL JOURNAL
	2006-07-01
卷号	645 期号:1 页码:L1-L4
关键词	cosmology : theory early universe intergalactic medium
ISSN号	0004-637X
英文摘要	We study the Gunn-Peterson effect of the photoionized intergalactic medium (IGM) in the redshift range using semianalytic simulations based on the lognormal model. Assuming a rapidly evolved and spatially 5 < z < 6.4 uniform ionizing background, the simulation can produce all the observed abnormal statistical features near redshift. They include (1) a rapid increase of absorption depths, (2) large scatter in the optical depths, z similar or equal to 6 (3) long-tailed distributions of transmitted flux, and (4) long dark gaps in spectra. These abnormal features are mainly due to rare events, which correspond to the long-tailed probability distribution of the IGM density field, and therefore they may not imply significant spatial fluctuations in the UV ionizing background at z similar or equal to 6.
学科主题	Astronomy & Astrophysics
WOS标题词	Science & Technology ; Physical Sciences
类目[WOS]	Astronomy & Astrophysics
研究领域[WOS]	Astronomy & Astrophysics
关键词[WOS]	LY-ALPHA FOREST ; INTERGALACTIC MEDIUM TRANSMISSION ; QUASI-STELLAR OBJECTS ; POWER SPECTRUM ; TRANSMITTED FLUX ; MASS FIELD ; APPROACHING REIONIZATION ; INTERMITTENT BEHAVIOR ; EVOLUTION ; UNIVERSE
收录类别	SCI
语种	英语
WOS记录号	WOS:000238833100001
公开日期	2012-02-07
内容类型	期刊论文
源URL	[http://159.226.72.40/handle/332002/3544]
专题	紫金山天文台_毫米波和亚毫米波技术实验室
作者单位	1.Purple Mt Observ, Nanjing 210008, Peoples R China 2.Univ Sci & Technol China, Ctr Astrophys, Anhua 230026, Peoples R China 3.Univ Arizona, Dept Phys, Tucson, AZ 85721 USA 4.Chinese Acad Sci, Natl Astron Observ, Beijing 100012, Peoples R China
推荐引用方式 GB/T 7714	Liu, Jiren,Bi, Hongguang,Feng, Long-Long,et al. Is the cosmic ultraviolet background fluctuating at redshift z similar or equal to 6?[J]. ASTROPHYSICAL JOURNAL,2006,645(1):L1-L4.
APA	Liu, Jiren,Bi, Hongguang,Feng, Long-Long,&Fang, Li-Zhi.(2006).Is the cosmic ultraviolet background fluctuating at redshift z similar or equal to 6?.ASTROPHYSICAL JOURNAL,645(1),L1-L4.
MLA	Liu, Jiren,et al."Is the cosmic ultraviolet background fluctuating at redshift z similar or equal to 6?".ASTROPHYSICAL JOURNAL 645.1(2006):L1-L4.