NAOC Open IR
Onset of Cosmic Reionization: Evidence of an Ionized Bubble Merely 680 Myr after the Big Bang
Tilvi, V.1; Malhotra, S.2; Rhoads, J. E.2; Coughlin, A.3; Zheng, Z.4; Finkelstein, S. L.5; Veilleux, S.6,7; Mobasher, B.8; Wang, J.9; Probst, R.10; Swaters, R.6,7; Hibon, P.11; Joshi, B.1; Zabl, J.12; Jiang, T.1; Pharo, J.1; Yang, H.1
2020-03-01
Source PublicationASTROPHYSICAL JOURNAL LETTERS
ISSN2041-8205
Volume891Issue:1Pages:7
AbstractWhile most of the intergalactic medium (IGM) today is permeated by ionized hydrogen, it was largely filled with neutral hydrogen for the first 700 million years after the big bang. The process that ionized the IGM (cosmic reionization) is expected to be spatially inhomogeneous, with fainter galaxies likely playing a significant role. However, we still have only a few direct constraints on the reionization process. Here we report spectroscopic confirmation of two galaxies and very likely a third galaxy in a group (hereafter EGS77) at redshift z = 7.7, merely 680 Myr after the big bang. The physical separation among the three members is <0.7 Mpc. We estimate the radius of ionized bubble of the brightest galaxy to be about 1.02 Mpc, and show that the individual ionized bubbles formed by all three galaxies likely overlap significantly, forming a large yet localized ionized region, indicative of inhomogeneity in the reionization process. It is striking that two of three galaxies in EGS77 are quite faint in the continuum, thanks to our selection using their Ly alpha line emission in the narrowband filter. Indeed, one is the faintest spectroscopically confirmed galaxy yet discovered at such high redshifts. Our observations provide direct constraints on the process of cosmic reionization, and allow us to investigate the properties of sources responsible for reionizing the universe.
Funding OrganizationUS NSF ; US NSF ; NASA through the WFIRST Science Investigation Team program ; NASA through the WFIRST Science Investigation Team program ; NSF of China ; NSF of China ; CAS Pioneer Hundred Talents Program ; CAS Pioneer Hundred Talents Program ; W.M. Keck Foundation ; W.M. Keck Foundation ; US NSF ; US NSF ; NASA through the WFIRST Science Investigation Team program ; NASA through the WFIRST Science Investigation Team program ; NSF of China ; NSF of China ; CAS Pioneer Hundred Talents Program ; CAS Pioneer Hundred Talents Program ; W.M. Keck Foundation ; W.M. Keck Foundation ; US NSF ; US NSF ; NASA through the WFIRST Science Investigation Team program ; NASA through the WFIRST Science Investigation Team program ; NSF of China ; NSF of China ; CAS Pioneer Hundred Talents Program ; CAS Pioneer Hundred Talents Program ; W.M. Keck Foundation ; W.M. Keck Foundation ; US NSF ; US NSF ; NASA through the WFIRST Science Investigation Team program ; NASA through the WFIRST Science Investigation Team program ; NSF of China ; NSF of China ; CAS Pioneer Hundred Talents Program ; CAS Pioneer Hundred Talents Program ; W.M. Keck Foundation ; W.M. Keck Foundation
DOI10.3847/2041-8213/ab75ec
WOS KeywordLY-ALPHA EMITTERS ; EMITTING GALAXIES ; COSMOLOGICAL REIONIZATION ; REDSHIFT ; GROWTH ; EPOCH ; Z=6.5 ; CONSTRAINTS ; FRACTION ; Z=5.7
Language英语
Funding ProjectUS NSF[AST-1518057] ; NASA through the WFIRST Science Investigation Team program[NNG16PJ33C] ; NSF of China[11773051] ; CAS Pioneer Hundred Talents Program ; W.M. Keck Foundation
Funding OrganizationUS NSF ; US NSF ; NASA through the WFIRST Science Investigation Team program ; NASA through the WFIRST Science Investigation Team program ; NSF of China ; NSF of China ; CAS Pioneer Hundred Talents Program ; CAS Pioneer Hundred Talents Program ; W.M. Keck Foundation ; W.M. Keck Foundation ; US NSF ; US NSF ; NASA through the WFIRST Science Investigation Team program ; NASA through the WFIRST Science Investigation Team program ; NSF of China ; NSF of China ; CAS Pioneer Hundred Talents Program ; CAS Pioneer Hundred Talents Program ; W.M. Keck Foundation ; W.M. Keck Foundation ; US NSF ; US NSF ; NASA through the WFIRST Science Investigation Team program ; NASA through the WFIRST Science Investigation Team program ; NSF of China ; NSF of China ; CAS Pioneer Hundred Talents Program ; CAS Pioneer Hundred Talents Program ; W.M. Keck Foundation ; W.M. Keck Foundation ; US NSF ; US NSF ; NASA through the WFIRST Science Investigation Team program ; NASA through the WFIRST Science Investigation Team program ; NSF of China ; NSF of China ; CAS Pioneer Hundred Talents Program ; CAS Pioneer Hundred Talents Program ; W.M. Keck Foundation ; W.M. Keck Foundation
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS IDWOS:000537513000003
PublisherIOP PUBLISHING LTD
Citation statistics
Document Type期刊论文
Identifierhttp://ir.bao.ac.cn/handle/114a11/83475
Collection中国科学院国家天文台
Corresponding AuthorTilvi, V.
Affiliation1.Arizona State Univ, Sch Earth & Space Explorat, Tempe, AZ 85287 USA
2.Goddard Space Flight Ctr, Astrophys Sci Div, Greenbelt, MD 20771 USA
3.Chandler Gilbert Community Coll, Chandler, AZ 85225 USA
4.Chinese Acad Sci, Shanghai Astron Observ, Key Lab Res Galaxies & Cosmol, Shanghai 200030, Peoples R China
5.Univ Texas Austin, Dept Astron, RLM 15308, Austin, TX 78712 USA
6.Univ Maryland, Dept Phys, College Pk, MD 20742 USA
7.Univ Maryland, Joint Space Sci Inst, College Pk, MD 20742 USA
8.Univ Calif Riverside, Dept Phys & Astron, Riverside, CA 92521 USA
9.Univ Sci & Technol China, CAS, Dept Astron, Key Lab Res Galaxies & Cosmol, Hefei 230026, Anhui, Peoples R China
10.Natl Opt Astron Observ, 950 N Cherry Ave, Tucson, AZ 85719 USA
11.European Southern Observ, Alonso de Cordova 3107, Santiago 19001, Chile
12.Univ Lyon1, Univ Lyon, Ens Lyon, CNRS,Ctr Rech Astrophys Lyon,UMR5574, F-69230 St Genis Laval, France
Recommended Citation
GB/T 7714
Tilvi, V.,Malhotra, S.,Rhoads, J. E.,et al. Onset of Cosmic Reionization: Evidence of an Ionized Bubble Merely 680 Myr after the Big Bang[J]. ASTROPHYSICAL JOURNAL LETTERS,2020,891(1):7.
APA Tilvi, V..,Malhotra, S..,Rhoads, J. E..,Coughlin, A..,Zheng, Z..,...&Yang, H..(2020).Onset of Cosmic Reionization: Evidence of an Ionized Bubble Merely 680 Myr after the Big Bang.ASTROPHYSICAL JOURNAL LETTERS,891(1),7.
MLA Tilvi, V.,et al."Onset of Cosmic Reionization: Evidence of an Ionized Bubble Merely 680 Myr after the Big Bang".ASTROPHYSICAL JOURNAL LETTERS 891.1(2020):7.
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