Lyα EMITTER GALAXIES AT z?～?2.8 IN THE EXTENDED CHANDRA DEEP FIELD SOUTH. I. TRACING THE LARGE-SCALE STRUCTURE VIA Lyα IMAGING??This paper includes data gathered with the 6.5 m Magellan Telescopes located at Las Campanas Observatory, Chile.
文献类型：期刊论文
| 作者 | Zheng,Zhen-Ya3,6,7; Malhotra,Sangeeta7; Rhoads,James E.7; Finkelstein,Steven L.4; Wang,Jun-Xian5; Jiang,Chun-Yan1,2,3; Cai,Zheng8 |
| 刊名 | The Astrophysical Journal Supplement Series
 |
| 出版日期 | 2016-10-17 |
| 卷号 | 226期号:2 |
| ISSN号 | 0067-0049 |
| 关键词 | galaxies: evolution galaxies: high-redshift galaxies: luminosity function galaxies: structure mass function |
| DOI | 10.3847/0067-0049/226/2/23 |
| 英文摘要 | ABSTRACT We present a narrowband survey with three adjacent filters for z?=?2.8–2.9 Lyman alpha (Lyα) emitter (LAE) galaxies in the Extended Chandra Deep Field South (ECDFS), along with spectroscopic follow-up. With a complete sample of 96 LAE candidates in the narrowband NB466, we confirm the large-scale structure at z?～?2.8 suggested by previous spectroscopic surveys. Compared to the blank field detected with the other two narrowband filters NB470 and NB475, the LAE-density excess in NB466 (900 arcmin2) is?～?6.0 ±?0.8 times the standard deviation expected at z?～?2.8, assuming a linear bias of 2. The overdense large-scale structure in NB466 can be decomposed into four protoclusters, whose overdensities (each within an equivalent comoving volume 153 Mpc3) relative to the blank field (NB470+NB475) are in the range of 4.6–6.6. These four protoclusters are expected to evolve into a Coma-like cluster (M?≥?1015 M⊙) at z?～?0. We also investigate the various properties of LAEs at z?=?2.8–2.9 and their dependence on the environment. The average star formation rates derived from the Lyα, rest-frame UV, and X-ray bands are ～4, 10, and <16 M⊙ yr?1, respectively, implying a Lyα escape fraction of 25%??? ???40% and a UV continuum escape fraction of ?? 62% for LAEs at z ～ 2.8. The Lyα photon density calculated from the integrated Lyα luminosity function in the overdense field (NB466) is ～50% higher than that in the blank field (NB470+NB475), and more bright LAEs are found in the overdense field. The three brightest LAEs, including a quasar at z?=?2.81, are all detected in the X-ray band and in NB466. These three LAE-active galactic nuclei contribute an extra 20%–30% Lyα photon density compared to other LAE galaxies. Furthermore, we find that LAEs in overdense regions have larger equivalent width values, bluer U ? B and V ? R (～2–3σ) colors compared with those in lower density regions, indicating that LAEs in overdense regions are younger and possible less dusty. We conclude that the structure at z ～ 2.8 in the ECDFS field is a very significant and rare density peak similar to the SSA22 protocluster, and narrowband imaging is an efficient method of detecting and studying such structures in the high-z universe. |
| 语种 | 英语 |
| 出版者 | The American Astronomical Society |
| WOS记录号 | IOP:0067-0049-226-2-23 |
| 源URL | [http://119.78.226.72/handle/331011/32163]  |
| 专题 | 中国科学院上海天文台 |
| 作者单位 | 1.Nucleo de Astronomia de la Facultad de Ingenieria, Universidad Diego Portales, Av. Ejercito Libertador 441, Santiago, Chile 2.CAS Key Laboratory for Research in Galaxies and Cosmology, Shanghai Astronomical Observatory, Nandan Road 80, Shanghai 200030, China; cyjiang@shao.ac.cn 3.Chinese Academy of Sciences South America Center for Astronomy, 7591245 Santiago, Chile 4.Department of Astronomy, The University of Texas, Austin, TX 78712, USA; stevenf@astro.as.utexas.edu 5.CAS Key Laboratory for Research in Galaxies and Cosmology, Department of Astronomy, University of Science and Technology of China, Hefei, Anhui 230026, China; jxw@ustc.edu.cn 6.Instituto de Astrofisica, Pontificia Universidad Catolica de Chile, 7820436 Santiago, Chile; zzheng@astro.puc.cl 7.School of Earth and Space Exploration, Arizona State University, Tempe, AZ 85287, USA; sangeeta.malhotra@asu.edu, james.rhoads@asu.edu 8.UCO/Lick Observatory, University of California, 1156 High Street, Santa Cruz, CA 95064, USA; zcai@ucolick.org |
| 推荐引用方式 GB/T 7714 | Zheng,Zhen-Ya,Malhotra,Sangeeta,Rhoads,James E.,等. Lyα EMITTER GALAXIES AT z?～?2.8 IN THE EXTENDED CHANDRA DEEP FIELD SOUTH. I. TRACING THE LARGE-SCALE STRUCTURE VIA Lyα IMAGING??This paper includes data gathered with the 6.5 m Magellan Telescopes located at Las Campanas Observatory, Chile.[J]. The Astrophysical Journal Supplement Series,2016,226(2). |
| APA | Zheng,Zhen-Ya.,Malhotra,Sangeeta.,Rhoads,James E..,Finkelstein,Steven L..,Wang,Jun-Xian.,...&Cai,Zheng.(2016).Lyα EMITTER GALAXIES AT z?～?2.8 IN THE EXTENDED CHANDRA DEEP FIELD SOUTH. I. TRACING THE LARGE-SCALE STRUCTURE VIA Lyα IMAGING??This paper includes data gathered with the 6.5 m Magellan Telescopes located at Las Campanas Observatory, Chile..The Astrophysical Journal Supplement Series,226(2). |
| MLA | Zheng,Zhen-Ya,et al."Lyα EMITTER GALAXIES AT z?～?2.8 IN THE EXTENDED CHANDRA DEEP FIELD SOUTH. I. TRACING THE LARGE-SCALE STRUCTURE VIA Lyα IMAGING??This paper includes data gathered with the 6.5 m Magellan Telescopes located at Las Campanas Observatory, Chile.".The Astrophysical Journal Supplement Series 226.2(2016). |
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