LAGER Lyα Luminosity Function at z ∼ 7: Implications for Reionization

被引:53
作者
Wold, Isak G. B. [1 ]
Malhotra, Sangeeta [1 ]
Rhoads, James [1 ]
Wang, Junxian [2 ,3 ]
Hu, Weida [2 ,3 ]
Perez, Lucia A. [4 ]
Zheng, Zhen-Ya [5 ]
Khostovan, Ali Ahmad [1 ]
Walker, Alistair R. [6 ]
Felipe Barrientos, L. [7 ,8 ]
Gonzalez-Lopez, Jorge [7 ,8 ,9 ]
Harish, Santosh [4 ]
Infante, Leopoldo [10 ]
Jiang, Chunyan [5 ]
Pharo, John [4 ]
Moya-Sierralta, Cristobal [7 ,8 ]
Bauer, Franz E. [7 ,8 ,11 ,12 ]
Galaz, Gaspar [7 ,8 ]
Valdes, Francisco [13 ]
Yang, Huan [10 ]
机构
[1] NASA, Goddard Space Flight Ctr, Astrophys Sci Div, 8800 Greenbelt Rd, Greenbelt, MD 20771 USA
[2] Univ Sci & Technol China, Dept Astron, CAS Key Lab Res Galaxies & Cosmol, Hefei 230026, Anhui, Peoples R China
[3] Univ Sci & Technol China, Sch Astron & Space Sci, Hefei 230026, Peoples R China
[4] Arizona State Univ, Sch Earth & Space Explorat, Tempe, AZ 85287 USA
[5] Shanghai Astron Observ, CAS Key Lab Res Galaxies & Cosmol, Shanghai 200030, Peoples R China
[6] NSFs NOIRLab, Cerro Tololo Interamer Observ, Casilla 603, La Serena, Chile
[7] Pontificia Univ Catolica Chile, Fac Fis, Inst Astrofis, Casilla 306, Santiago 22, Chile
[8] Pontificia Univ Catolica Chile, Fac Fis, Ctr Astroingn, Casilla 306, Santiago 22, Chile
[9] Univ Diego Portales, Nude Astron, Fac Ingn & Ciencias, Av Ejercito Libertador 441, Santiago, Chile
[10] Carnegie Inst Washington, Las Campanas Observ, Casilla 601, La Serena, Chile
[11] Millennium Inst Astrophys, Nuncio Monsefior Sotero Sanz 100,104, Santiago, Chile
[12] Space Sci Inst, 4750 Walnut St,Suite 205, Boulder, CO 80301 USA
[13] Natl Opt Astron Observ, 950 N Cherry Ave, Tucson, AZ 85719 USA
基金
美国国家科学基金会; 日本学术振兴会; 日本科学技术振兴机构; 美国国家航空航天局; 英国科学技术设施理事会;
关键词
HUBBLE DEEP FIELD; EMITTING GALAXIES; COSMIC REIONIZATION; SPECTROSCOPIC CONFIRMATION; LYMAN BREAK; REDSHIFT; EVOLUTION; EMITTERS; EPOCH; CONSTRAINTS;
D O I
10.3847/1538-4357/ac4997
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
We present a new measurement of the Ly alpha luminosity function (LF) at redshift z = 6.9, finding moderate evolution from z = 5.7 that is consistent with a fully or largely ionized z similar to 7 intergalactic medium. Our result is based on four fields of the LAGER (Lyman Alpha Galaxies in the Epoch of Reionization) project. Our survey volume of 6.1 x 10(6) Mpc(3) is double that of the next largest z similar to 7 survey. We combine two new LAGER fields (WIDE12 and GAMA15A) with two previously reported LAGER fields (COSMOS and CDFS). In the new fields, we identify N = 95 new z = 6.9 Ly alpha emitter (LAEs) candidates, characterize our survey's completeness and reliability, and compute Ly alpha LFs. The best-fit Schechter LF parameters for all four LAGER fields are in good general agreement. Two fields (COSMOS and WIDE12) show evidence for a bright-end excess above the Schechter function fit. We find that the Ly alpha luminosity density declines at the same rate as the UV continuum LF from z = 5.7 to 6.9. This is consistent with an intergalactic medium that was fully ionized as early as redshift z similar to 7 or with a volume-averaged neutral hydrogen fraction of x (H I) < 0.33 at 1 sigma.
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页数:15
相关论文
共 90 条
[11]  
CASH W, 1979, ASTROPHYS J, V228, P939, DOI 10.1086/156922
[12]  
Chambers K.C., 2016, The Pan-STARRS1 Surveys
[13]   Hα Emitting Galaxies at z ∼ 0.6 in the Deep And Wide Narrow-band Survey [J].
Coughlin, Alicia ;
Rhoads, James E. ;
Malhotra, Sangeeta ;
Probst, Ronald ;
Swaters, Rob ;
Tilvi, Vithal S. ;
Zheng, Zhen-Ya ;
Finkelstein, Steven ;
Hibon, Pascale ;
Mobasher, Bahram ;
Jiang, Tianxing ;
Joshi, Bhavin ;
Pharo, John ;
Veilleux, Sylvain ;
Wang, Junxian ;
Yang, Huan ;
Zabl, Johannes .
ASTROPHYSICAL JOURNAL, 2018, 858 (02)
[14]   The bright-star masks for the HSC-SSP survey [J].
Coupon, Jean ;
Czakon, Nicole ;
Bosch, James ;
Komiyama, Yutaka ;
Medezinski, Elinor ;
Miyazaki, Satoshi ;
Oguri, Masamune .
PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF JAPAN, 2018, 70
[15]   Lyα EMITTING GALAXIES AS EARLY STAGES IN GALAXY FORMATION [J].
Cowie, Lennox L. ;
Barger, Amy J. ;
Hu, Esther M. .
ASTROPHYSICAL JOURNAL, 2011, 738 (02)
[16]   High-z Lyα emitters.: I.: A blank-field search for objects near redshift z=3.4 in and around the Hubble deep field and the Hawaii Deep Field SSA 22 [J].
Cowie, LL ;
Hu, EM .
ASTRONOMICAL JOURNAL, 1998, 115 (04) :1319-1328
[17]  
Cutri R. M., 2003, The IRSA 2MASS All-Sky Point Source Catalog
[18]   Lyα-emitting galaxies at 0.2 &lt; z &lt; 0.35 from GALEX spectroscopy [J].
Deharveng, Jean-Michel ;
Small, Todd ;
Barlow, Tom A. ;
Peroux, Celine ;
Milliard, Bruno ;
Friedman, Peter G. ;
Martin, D. Christopher ;
Morrissey, Patrick ;
Schiminovich, David ;
Forster, Karl ;
Seibert, Mark ;
Wyder, Ted K. ;
Bianchi, Luciana ;
Donas, Jose ;
Heckman, Timothy M. ;
Lee, Young-Wook ;
Madore, Barry F. ;
Neff, Susan G. ;
Rich, R. Michael ;
Szalay, Alex S. ;
Welsh, Barry Y. ;
Yi, Sukyoung K. .
ASTROPHYSICAL JOURNAL, 2008, 680 (02) :1072-1082
[19]   Luminosity functions of Lyα emitting galaxies and cosmic reionization of hydrogen [J].
Dijkstra, Mark ;
Wyithe, J. Stuart B. ;
Haiman, Zoltan .
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, 2007, 379 (01) :253-259
[20]   The MUSE &ITHubble&IT Ultra Deep Field Survey VI. The faint-end of the Lyα luminosity function at 2.91 < &ITz&IT < 6.64and implications for reionisation [J].
Drake, A. B. ;
Garel, T. ;
Wisotzki, L. ;
Leclercq, F. ;
Hashimoto, T. ;
Richard, J. ;
Bacon, R. ;
Blaizot, J. ;
Caruana, J. ;
Conseil, S. ;
Contini, T. ;
Guiderdoni, B. ;
Herenz, E. C. ;
Inami, H. ;
Lewis, J. ;
Mahler, G. ;
Marino, R. A. ;
Pello, R. ;
Schaye, J. ;
Verhamme, A. ;
Ventou, E. ;
Weilbacher, P. M. .
ASTRONOMY & ASTROPHYSICS, 2017, 608