Lyα-emitting galaxies at 0.2 < z < 0.35 from GALEX spectroscopy

被引:85
作者
Deharveng, Jean-Michel [1 ]
Small, Todd [2 ]
Barlow, Tom A. [2 ]
Peroux, Celine [1 ]
Milliard, Bruno [1 ]
Friedman, Peter G. [2 ]
Martin, D. Christopher [2 ]
Morrissey, Patrick [2 ]
Schiminovich, David [3 ]
Forster, Karl [2 ]
Seibert, Mark [2 ]
Wyder, Ted K. [2 ]
Bianchi, Luciana
Donas, Jose [1 ]
Heckman, Timothy M. [4 ]
Lee, Young-Wook [5 ]
Madore, Barry F. [6 ]
Neff, Susan G. [7 ]
Rich, R. Michael [8 ]
Szalay, Alex S. [4 ]
Welsh, Barry Y. [9 ]
Yi, Sukyoung K. [5 ]
机构
[1] Univ Aix Marseille 1, CNRS, UMR 6110, Astrophys Lab, F-13376 Marseille 12, France
[2] CALTECH, Pasadena, CA 91125 USA
[3] Columbia Univ, Dept Astron, New York, NY 10027 USA
[4] Johns Hopkins Univ, Ctr Astrophys Sci, Baltimore, MD 21218 USA
[5] Yonsei Univ, Ctr Space Astrophys, Seoul 120749, South Korea
[6] Observ Carnegie Inst Washington, Pasadena, CA 91101 USA
[7] NASA, Goddard Space Flight Ctr, Astron & Solar Phys Lab, Greenbelt, MD 20771 USA
[8] Univ Calif Los Angeles, Dept Phys & Astron, Los Angeles, CA 90095 USA
[9] Univ Calif Berkeley, Space Sci Lab, Berkeley, CA 94720 USA
关键词
galaxies : evolution; galaxies : ISM; galaxies : luminosity function; mass function; galaxies : starburst; ultraviolet : galaxies;
D O I
10.1086/587953
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
We have used the GALEX (Galaxy Evolution Explorer) spectroscopic survey mode, with a resolution of similar to 8 angstrom in the far-ultraviolet (FUV; 1350-1750 angstrom) and similar to 20 angstrom in the near-ultraviolet (NUV; 1950-2750 angstrom) for a systematic search of Ly alpha-emitting galaxies at low redshift. Our aim is to fill a gap between high-redshift surveys and a small set of objects studied in detail in the nearby universe. A blind search of 7018 spectra extracted in five deep exposures (5.65 deg(2)) has resulted in 96 Ly alpha-emitting galaxy candidates in the FUV domain after accounting for broad-line AGNs. The Ly alpha equivalent widths (EWs) are consistent with stellar population model predictions and show no trends as a function of UV color or UV luminosity, with the exception of a possible decrease in the most luminous objects that may be due to small-number statistics. The objects' distribution in EW is similar to that at z similar to 3, but their fraction among star-forming galaxies is smaller. Avoiding uncertain candidates, a subsample of 66 objects in the range 0.2 < z < 0.35 has been used to build a Ly alpha luminosity function (LF). The incompleteness due to objects with significant Ly alpha emission but a UV continuum too low for spectral extraction has been evaluated. A comparison with H alpha LFs in the same redshift domain is consistent with an average Ly alpha/H alpha of similar to 1 in about 15% of the star-forming galaxies. A comparison with high-redshift Ly alpha LFs implies an increase of the Ly alpha luminosity density by a factor of about 16 from z similar to 0.3 to z similar to 3. By comparison with the factor of 5 increase in the UV luminosity density in the same redshift range, this suggests an increase of the average Ly alpha escape fraction with redshift.
引用
收藏
页码:1072 / 1082
页数:11
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