DETECTION OF LYMAN-ALPHA EMISSION FROM A TRIPLY IMAGED z=6.85 GALAXY BEHIND MACS J2129.4-0741

被引：33

作者：

Huang, Kuang-Han ^{[1
]}

Lemaux, Brian C. ^{[1
]}

Schmidt, Kasper B. ^{[2
]}

Hoag, Austin ^{[1
]}

Bradac, Marusa ^{[1
]}

Treu, Tommaso ^{[3
]}

Dijkstra, Mark ^{[4
]}

Fontana, Adriano ^{[5
]}

Henry, Alaina ^{[6
]}

Malkan, Matthew ^{[3
]}

Mason, Charlotte ^{[3
]}

Morishita, Takahiro ^{[3
,7
]}

Pentericci, Laura ^{[5
]}

Ryan, Russell E., Jr. ^{[8
]}

Trenti, Michele ^{[9
]}

Wang, Xin ^{[3
]}

机构：

[1] Univ Calif Davis, 1 Shields Ave, Davis, CA 95616 USA

[2] Leibniz Inst Astrophys Potsdam AIP, Sternwarte 16, D-14482 Potsdam, Germany

[3] Univ Calif Los Angeles, Dept Phys & Astron, Los Angeles, CA 90095 USA

[4] Univ Oslo, Inst Theoret Astrophys, POB 1029, NO-0315 Oslo, Norway

[5] Osserv Astron Roma, INAF, Via Frascati 33, I-00040 Monte Porzio Catone, RM, Italy

[6] NASA, Goddard Space Flight Ctr, Astrophys Sci Div, Code 665, Greenbelt, MD 20771 USA

[7] Tohoku Univ, Astron Inst, Aoba Ku, Sendai, Miyagi 9808578, Japan

[8] Space Telescope Sci Inst, Baltimore, MD 21218 USA

[9] Univ Melbourne, Sch Phys, Melbourne, Vic 3010, Australia

来源：

ASTROPHYSICAL JOURNAL LETTERS | 2016年 / 823卷 / 01期

关键词：

galaxies: evolution; galaxies: high-redshift; gravitational lensing: strong; methods: data analysis; STAR-FORMING GALAXIES; HUBBLE-SPACE-TELESCOPE; SIMILAR-TO; 10; LENS-AMPLIFIED SURVEY; SPECTROSCOPIC CONFIRMATION; COSMIC REIONIZATION; HST SPECTROSCOPY; LUMINOUS GALAXY; FAINT GALAXIES; CLUSTER;

D O I：

10.3847/2041-8205/823/1/L14

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We report the detection of Ly alpha emission at similar to 9538 angstrom in the Keck/DEIMOS and Hubble Space Telescope WFC3 G102 grism data from a triply imaged galaxy at z = 6.846 +/- 0.001 behind galaxy cluster MACS J2129.4-0741. Combining the emission line wavelength with broadband photometry, line ratio upper limits, and lens modeling, we rule out the scenario that this emission line is [O II] at z = 1.57. After accounting for magnification, we calculate the weighted average of the intrinsic Ly alpha luminosity to be similar to 1.3 x 10(42) erg s(-1) and Ly alpha equivalent width to be 74 +/- 15 angstrom. Its intrinsic UV absolute magnitude at 1600 angstrom is -18.6 +/- 0.2 mag and stellar mass (1.5 +/- 0.3) x 10(7) M-circle dot, making it one of the faintest (intrinsic L-UV similar to 0.14 L-UV*) galaxies with Ly alpha detection at z similar to 7 to date. Its stellar mass is in the typical range for the galaxies thought to dominate the reionization photon budget at z greater than or similar to 7; the inferred Ly alpha escape fraction is high (greater than or similar to 10%), which could be common for sub-L* z greater than or similar to 7 galaxies with Ly alpha emission. This galaxy offers a glimpse of the galaxy population that is thought to drive reionization, and it shows that gravitational lensing is an important avenue for probing the sub-L* galaxy population.

引用

页数：6

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