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Ly alpha leaks in the absorption spectra of high-redshift quasi-stellar objects
Liu, Jiren1; Bi, Hongguang2,3; Fang, Li-Zhi1
2007-12-20
Source PublicationASTROPHYSICAL JOURNAL LETTERS
Volume671Issue:2Pages:L89-L92
AbstractSpectra of high-redshift QSOs show deep Gunn-Peterson absorptions on the blue sides of the Ly alpha emissions lines. They can be decomposed into components called Ly alpha leaks, defined to be emissive regions in complementary to otherwise zero-flux absorption gaps. Just like Ly alpha absorption forests at low redshifts, Ly alpha leaks are easy to find in observations and contain rich sets of statistical properties that can be used to study the early evolution of the intergalactic medium (IGM). Among all properties of a leak profile, we investigate its equivalent width in this paper, since it is weakly affected by instrumental resolution and noise. Using 10 Keck QSO spectra at z similar to 6, we have measured the number density distribution function n(W,z), defined to be the number of leaks per equivalent width W and per redshift z in the redshift range 5.4 - 6.0. These new observational statistics, in both the differential and cumulative forms, fit well to hydrodynamic simulations of uniform ionizing background in the Lambda CDM cosmology. In this model, Ly alpha leaks are mainly due to low-density voids. It supports the early studies that the IGM at z similar or equal to 6 would still be in a highly ionized state with a neutral hydrogen fraction similar or equal to 10(-4). Measurements of n(W, z) at z > 6 would be effective to probe the reionization of the IGM.
KeywordCosmology : Theory Intergalactic Medium
WOS HeadingsScience & Technology ; Physical Sciences
WOS KeywordGUNN-PETERSON TROUGH ; COSMIC REIONIZATION ; Z-SIMILAR-TO-6 QUASARS ; INTERGALACTIC MEDIUM ; PATCHY REIONIZATION ; EVOLUTION ; EPOCH ; GALAXIES
Indexed BySCI
Language英语
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS IDWOS:000255231700001
Citation statistics
Cited Times:4[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://libir.pmo.ac.cn/handle/332002/15861
Collection南极天文中心
Affiliation1.Univ Arizona, Dept Phys, Tucson, AZ 85721 USA
2.Acad Sinica, Purple Mt Observ, Nanjing 210008, Peoples R China
3.Chinese Acad Sci, Natl Astron Observ, Beijing, Peoples R China
Recommended Citation
GB/T 7714
Liu, Jiren,Bi, Hongguang,Fang, Li-Zhi. Ly alpha leaks in the absorption spectra of high-redshift quasi-stellar objects[J]. ASTROPHYSICAL JOURNAL LETTERS,2007,671(2):L89-L92.
APA Liu, Jiren,Bi, Hongguang,&Fang, Li-Zhi.(2007).Ly alpha leaks in the absorption spectra of high-redshift quasi-stellar objects.ASTROPHYSICAL JOURNAL LETTERS,671(2),L89-L92.
MLA Liu, Jiren,et al."Ly alpha leaks in the absorption spectra of high-redshift quasi-stellar objects".ASTROPHYSICAL JOURNAL LETTERS 671.2(2007):L89-L92.
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