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First Results from the Lyman Alpha Galaxies in the Epoch of Reionization (LAGER) Survey: Cosmological Reionization at z similar to 7
Zheng, Zhen-Ya1,2,3; Wang, Junxian4; Rhoads, James5,6; Infante, Leopoldo2; Malhotra, Sangeeta5,6; Hu, Weida4; Walker, Alistair R.7; Jiang, Linhua8; Jiang, Chunyan1,3,9; Hibon, Pascale10; Gonzalez, Alicia5; Kong, Xu4; Zheng, XianZhong11; Galaz, Gaspar2; Felipe Barrientos, L.2
2017-06-20
Source PublicationASTROPHYSICAL JOURNAL LETTERS
ISSN2041-8205
Volume842Issue:2Pages:7
Corresponding AuthorZheng, Zhen-Ya(zhengzy@shao.ac.cn)
AbstractWe present the first results from the ongoing Lyman Alpha Galaxies in the Epoch of Reionization (LAGER) project, which is the largest narrowband survey for z similar to 7 galaxies to date. Using a specially built narrowband filter NB964 for the superb large-area Dark Energy Camera (DECam) on the NOAO/CTIO 4 m Blanco telescope, LAGER has collected 34 hr NB964 narrowband imaging data in the 3 deg(2) COSMOS field. We have identified 23 Ly alpha Emitter candidates at z = 6.9 in the central 2-deg(2) region, where DECam and public COSMOS multi-band images exist. The resulting luminosity function (LF) can be described as a Schechter function modified by a significant excess at the bright end (four galaxies with L-Ly alpha similar to 10(43.4 +/- 0.2) erg s(-1)). The number density at L-Ly alpha similar to 10(43.4 +/- 0.2) erg s(-1) is little changed from z = 6.6, while at fainter L-Ly alpha it is substantially reduced. Overall, we see a fourfold reduction in Ly alpha luminosity density from z = 5.7 to z = 6.9. Combined with a more modest evolution of the continuum UV luminosity density, this suggests a factor of similar to 3 suppression of Ly alpha by radiative transfer through the z similar to 7 intergalactic medium (IGM). It indicates an IGM neutral fraction of x(HI) similar to 0.4-0.6 (assuming Ly alpha velocity offsets of 100-200 km s(-1)). The changing shape of the Ly alpha LF between z less than or similar to 6.6 and z = 6.9 supports the hypothesis of ionized bubbles in a patchy reionization at z similar to 7.
Keywordcosmology: observations dark ages, reionization, first stars galaxies: high-redshift galaxies: luminosity function, mass function
DOI10.3847/2041-8213/aa794f
WOS KeywordLY-ALPHA ; LUMINOSITY FUNCTION ; EMITTING GALAXIES ; DEEP SURVEY ; INTERGALACTIC MEDIUM ; COSMIC REIONIZATION ; STELLAR POPULATION ; EMITTERS ; REDSHIFT ; EVOLUTION
Indexed BySCI
Language英语
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS IDWOS:000404117300002
PublisherIOP PUBLISHING LTD
Citation statistics
Document Type期刊论文
Identifierhttp://libir.pmo.ac.cn/handle/332002/22977
Collection中国科学院紫金山天文台
Corresponding AuthorZheng, Zhen-Ya
Affiliation1.Shanghai Astron Observ, CAS Key Lab Res Galaxies & Cosmol, Shanghai 200030, Peoples R China
2.Pontificia Univ Catolica Chile, Inst Astrophys & Ctr Astroengn, Santiago 7820436, Chile
3.Chinese Acad Sci, South Amer Ctr Astron, Santiago 7591245, Chile
4.Univ Sci & Technol China, Dept Astron, CAS Key Lab Res Galaxies & Cosmol, Hefei 230026, Anhui, Peoples R China
5.Arizona State Univ, Sch Earth & Space Explorat, Tempe, AZ 85287 USA
6.Goddard Space Flight Ctr, Astrophys Sci Div, 8800 Greenbelt Rd, Greenbelt, MD 20771 USA
7.Cerro Tololo Interamer Observ, Casilla 603, La Serena, Chile
8.Peking Univ, Kavli Inst Astron & Astrophys, Beijing 100871, Peoples R China
9.Univ Diego Portales, Fac Ingn & Ciencias, Nucleo Astron, Av Ejercito 441, Santiago, Chile
10.European Southern Observ, Alonso de Cordova 3107,Casilla 19001, Santiago, Chile
11.Chinese Acad Sci, Purple Mt Observ, Nanjing 210008, Jiangsu, Peoples R China
Recommended Citation
GB/T 7714
Zheng, Zhen-Ya,Wang, Junxian,Rhoads, James,et al. First Results from the Lyman Alpha Galaxies in the Epoch of Reionization (LAGER) Survey: Cosmological Reionization at z similar to 7[J]. ASTROPHYSICAL JOURNAL LETTERS,2017,842(2):7.
APA Zheng, Zhen-Ya.,Wang, Junxian.,Rhoads, James.,Infante, Leopoldo.,Malhotra, Sangeeta.,...&Felipe Barrientos, L..(2017).First Results from the Lyman Alpha Galaxies in the Epoch of Reionization (LAGER) Survey: Cosmological Reionization at z similar to 7.ASTROPHYSICAL JOURNAL LETTERS,842(2),7.
MLA Zheng, Zhen-Ya,et al."First Results from the Lyman Alpha Galaxies in the Epoch of Reionization (LAGER) Survey: Cosmological Reionization at z similar to 7".ASTROPHYSICAL JOURNAL LETTERS 842.2(2017):7.
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