THE SPECTRAL EVOLUTION OF THE FIRST GALAXIES. II. SPECTRAL SIGNATURES OF LYMAN CONTINUUM LEAKAGE FROM GALAXIES IN THE REIONIZATION EPOCH

被引：141
作者：
Zackrisson, Erik [1 ]
Inoue, Akio K. [2 ]
Jensen, Hannes [1 ]
机构：
[1] Stockholm Univ, AlbaNova, Oskar Klein Ctr, Dept Astron, SE-10691 Stockholm, Sweden
[2] Osaka Sangyo Univ, Coll Gen Educ, Daito, Osaka 5748530, Japan
来源：
ASTROPHYSICAL JOURNAL | 2013年 / 777卷 / 01期
基金：
瑞典研究理事会;
关键词：
dark ages; reionization; first stars; galaxies: high-redshift; techniques: spectroscopic; STAR-FORMING GALAXIES; HUBBLE-SPACE-TELESCOPE; HIGH-REDSHIFT GALAXIES; LY-ALPHA EMITTERS; TO; 7; GALAXIES; ESCAPE FRACTION; IONIZING-RADIATION; STELLAR POPULATIONS; BREAK GALAXIES; UV-CONTINUUM;
D O I：
10.1088/0004-637X/777/1/39
中图分类号：
P1 [天文学];
学科分类号：
0704 ;
摘要：
The fraction of ionizing photons that escape (f(esc)) from z greater than or similar to 6 galaxies is an important parameter for assessing the role of these objects in the reionization of the universe, but the opacity of the intergalactic medium precludes a direct measurement of f(esc) for individual galaxies at these epochs. We argue that since f(esc) regulates the impact of nebular emission on the spectra of galaxies, it should nonetheless be possible to indirectly probe f(esc) well into the reionization epoch. As a first step, we demonstrate that by combining measurements of the rest-frame UV slope beta with the equivalent width of the H beta emission line, galaxies with very high Lyman continuum escape fractions (f(esc) >= 0.5) should be identifiable up to z approximate to 9 through spectroscopy with the upcoming James Webb Space Telescope (JWST). By targeting strongly lensed galaxies behind low-redshift galaxy clusters, JWST spectra of sufficiently good quality can be obtained for M-1500 less than or similar to -16.0 galaxies at z approximate to 7 and for M-1500 less than or similar to -17.5 galaxies at z approximate to 9. Dust-obscured star formation may complicate the analysis, but supporting observations with ALMA or the planned SPICA mission may provide useful constraints on this effect.
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页数：12
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