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First Spectroscopic Confirmations of z?~?7.0 Lyα Emitting Galaxies in the LAGER Survey
Hu,Weida1,2; Wang,Junxian1,2; Zheng,Zhen-Ya3,4,5; Malhotra,Sangeeta6,7; Infante,Leopoldo4,5,8; Rhoads,James6,7; Gonzalez,Alicia6; Walker,Alistair R.9; Jiang,Linhua10; Jiang,Chunyan3; Hibon,Pascale11; Barrientos,L. Felipe4,5; Finkelstein,Steven12; Galaz,Gaspar4,5; Kang,Wenyong1,2; Kong,Xu1,2; Tilvi,Vithal6; Yang,Huan1,6; Zheng,XianZhong13
2017-08-17
Source PublicationThe Astrophysical Journal Letters
ISSN2041-8205
Volume845Issue:2
AbstractAbstract Narrowband imaging is a highly successful approach for finding large numbers of high-redshift Lyα emitting galaxies (LAEs) up to z?~?6.6. However, at z???7 there are as of yet only three narrowband selected LAEs with spectroscopic confirmations (two at z ~ 6.9–7.0, one at z ~ 7.3), which hinders extensive studies on cosmic reionization and galaxy evolution at this key epoch. We have selected 23 candidate z?~?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. Lyα emission lines are identified in six sources (yielding a success rate of 2/3), including three luminous LAEs with Lyα luminosities of LLyα?~?1043.5 erg s?1, the highest among known spectroscopically confirmed galaxies at ?7.0. This triples the sample size of spectroscopically confirmed narrowband selected LAEs at z???7, and confirms the bright-end bump in the Lyα 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 ~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 Lyα. A tentative narrow N vλ1240 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
Language英语
WOS IDIOP:2041-8205-845-2-aa8401
PublisherThe American Astronomical Society
Citation statistics
Document Type期刊论文
Identifierhttp://libir.pmo.ac.cn/handle/332002/23958
Collection中国科学院紫金山天文台
Affiliation1.CAS Key Laboratory for Research in Galaxies and Cosmology, Department of Astronomy, University of Science and Technology of China, Hefei, Anhui 230026, China; urverda@mail.ustc.edu.cn, jxw@ustc.edu.cn
2.School of Astronomy and Space Science, University of Science and Technology of China, Hefei 230026, China
3.CAS Key Laboratory for Research in Galaxies and Cosmology, Shanghai Astronomical Observatory, Shanghai 200030, China; zhengzy@shao.ac.cn
4.Centro de Astroingeniería, Facultad de Física, Pontificia Universidad Católica de Chile, Santiago, Chile
5.Instituto de Astrofísica, Facultad de Física, Pontificia Universidad Católica de Chile, Santiago, Chile
6.School of Earth and Space Exploration, Arizona State University, Tempe, AZ 85287, USA; Sangeeta.Malhotra@asu.edu, James.Rhoads@asu.edu
7.Astrophysics Science Division, Goddard Space Flight Center, 8800 Greenbelt Road, Greenbelt, MD 20771, USA
8.Las Campanas Observatory, Carnegie Institution for Science, Casilla 601, La Serena, Chile; linfante@carnegiescience.edu
9.Cerro Tololo Inter-American Observatory, Casilla 603, La Serena, Chile
10.The Kavli Institute for Astronomy and Astrophysics, Peking University, Beijing 100871, China
11.European Southern Observatory, Alonso de Cordova 3107, Casilla 19001, Santiago, Chile
12.Department of Astronomy, The University of Texas at Austin, Austin, TX 78712, USA
13.Purple Mountain Observatory, Chinese Academy of Sciences, Nanjing 210008, China
Recommended Citation
GB/T 7714
Hu,Weida,Wang,Junxian,Zheng,Zhen-Ya,等. First Spectroscopic Confirmations of z?~?7.0 Lyα Emitting Galaxies in the LAGER Survey[J]. The Astrophysical Journal Letters,2017,845(2).
APA Hu,Weida.,Wang,Junxian.,Zheng,Zhen-Ya.,Malhotra,Sangeeta.,Infante,Leopoldo.,...&Zheng,XianZhong.(2017).First Spectroscopic Confirmations of z?~?7.0 Lyα Emitting Galaxies in the LAGER Survey.The Astrophysical Journal Letters,845(2).
MLA Hu,Weida,et al."First Spectroscopic Confirmations of z?~?7.0 Lyα Emitting Galaxies in the LAGER Survey".The Astrophysical Journal Letters 845.2(2017).
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