PMO OpenIR
First Spectroscopic Confirmations of z similar to 7.0 Ly alpha Emitting Galaxies in the LAGER Survey
Hu, Weida1,2; Wang, Junxian1,2; Zheng, Zhen-Ya3,4,5; Malhotra, Sangeeta6,7; Infante, Leopoldo4,5; Rhoads, James6,7; Gonzalez, Alicia6; Walker, Alistair R.8; Jiang, Linhua9; Jiang, Chunyan3; Hibon, Pascale10; Felipe Barrientos, L.4,5; Finkelstein, Steven11; Galaz, Gaspar4,5; Kang, Wenyong1,2; Kong, Xu1,2; Tilvi, Vithal6; Yang, Huan1,6; Zheng, XianZhong12
2017-08-20
Source PublicationASTROPHYSICAL JOURNAL LETTERS
ISSN2041-8205
Volume845Issue:2Pages:6
Abstract

Narrowband imaging is a highly successful approach for finding large numbers of high-redshift Ly alpha emitting galaxies (LAEs) up to z similar to 6.6. However, at z greater than or similar to 7 there are as of yet only three narrowband selected LAEs with spectroscopic confirmations (two at z similar to 6.9-7.0, one at z similar to 7.3), which hinders extensive studies on cosmic reionization and galaxy evolution at this key epoch. We have selected 23 candidate z similar to 6.9 LAEs in COSMOS field with the large area narrowband survey Lyman-Alpha Galaxies at the End of Reionization (LAGER). In this work, we present spectroscopic follow-up observations of 12 candidates using the Inamori Magellan Areal Camera and Spectrograph on Magellan. For nine of these, the observations are sufficiently deep to detect the expected lines. Ly alpha emission lines are identified in six sources (yielding a success rate of 2/3), including three luminous LAEs with Ly alpha luminosities of L-Ly alpha similar to 10(43.5) erg s(-1), the highest among known spectroscopically confirmed galaxies at greater than or similar to 7.0. This triples the sample size of spectroscopically confirmed narrowband selected LAEs at z greater than or similar to 7, and confirms the bright-end bump in the Ly alpha luminosity function we previously derived based on the photometric sample, supporting a patchy reionization scenario. Two luminous LAEs appear physically linked with a projected distance of 1.1 pMpc and velocity difference of similar to 170 km s(-1). They likely sit in a common ionized bubble produced by themselves or with close neighbors, which reduces the intergalactic medium attenuation of Ly alpha. A tentative narrow N V lambda 1240 line is seen in one source, hinting at activity of a central massive black hole with metal-rich line-emitting gas.

Keywordcosmology: observations dark ages reionization first stars galaxies: formation galaxies: high-redshift
DOI10.3847/2041-8213/aa8401
WOS KeywordSTAR-FORMING GALAXIES ; LUMINOSITY FUNCTION ; DEEP FIELD ; REDSHIFT Z ; EMITTERS ; REIONIZATION ; EVOLUTION ; EMISSION ; Z=6.5 ; Z-APPROXIMATE-TO-4.5
Indexed BySCI
Language英语
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS IDWOS:000407971200004
PublisherIOP PUBLISHING LTD
Citation statistics
Cited Times:9[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://libir.pmo.ac.cn/handle/332002/22641
Collection中国科学院紫金山天文台
Corresponding AuthorHu, Weida
Affiliation1.Univ Sci & Technol China, Dept Astron, CAS Key Lab Res Galaxies & Cosmol, Hefei 230026, Anhui, Peoples R China
2.Univ Sci & Technol China, Sch Astron & Space Sci, Hefei 230026, Anhui, Peoples R China
3.Shanghai Astron Observ, CAS Key Lab Res Galaxies & Cosmol, Shanghai 200030, Peoples R China
4.Pontificia Univ Catolica Chile, Fac Fis, Ctr Astroingn, Santiago, Chile
5.Pontificia Univ Catolica Chile, Fac Fis, Inst Astrofis, Santiago, Chile
6.Arizona State Univ, Sch Earth & Space Explorat, Tempe, AZ 85287 USA
7.Goddard Space Flight Ctr, Astrophys Sci Div, 8800 Greenbelt Rd, Greenbelt, MD 20771 USA
8.Cerro Tololo Interamer Observ, Casilla 603, La Serena, Chile
9.Peking Univ, Kavli Inst Astron & Astrophys, Beijing 100871, Peoples R China
10.European So Observ, Alonso Cordova 3107,Casilla 19001, Santiago, Chile
11.Univ Texas Austin, Dept Astron, Austin, TX 78712 USA
12.Chinese Acad Sci, Purple Mt Observ, Nanjing 210008, Jiangsu, Peoples R China
Recommended Citation
GB/T 7714
Hu, Weida,Wang, Junxian,Zheng, Zhen-Ya,et al. First Spectroscopic Confirmations of z similar to 7.0 Ly alpha Emitting Galaxies in the LAGER Survey[J]. ASTROPHYSICAL JOURNAL LETTERS,2017,845(2):6.
APA Hu, Weida.,Wang, Junxian.,Zheng, Zhen-Ya.,Malhotra, Sangeeta.,Infante, Leopoldo.,...&Zheng, XianZhong.(2017).First Spectroscopic Confirmations of z similar to 7.0 Ly alpha Emitting Galaxies in the LAGER Survey.ASTROPHYSICAL JOURNAL LETTERS,845(2),6.
MLA Hu, Weida,et al."First Spectroscopic Confirmations of z similar to 7.0 Ly alpha Emitting Galaxies in the LAGER Survey".ASTROPHYSICAL JOURNAL LETTERS 845.2(2017):6.
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