LIMITS ON LYMAN CONTINUUM ESCAPE FROM z=2.2 Hα-EMITTING GALAXIES

被引：9

作者：

Sandberg, A. ^{[1
]}

Ostlin, G. ^{[1
]}

Melinder, J. ^{[1
]}

Bik, A. ^{[1
]}

Guaita, L. ^{[2
]}

机构：

[1] Stockholm Univ, Dept Astron, Oskar Klein Ctr, SE-10691 Stockholm, Sweden

[2] Osserv Astron Roma, NAF, I-00040 Monte Porzio Catone, Italy

来源：

ASTROPHYSICAL JOURNAL LETTERS | 2015年 / 814卷 / 01期

基金：

瑞典研究理事会;

关键词：

dark ages; reionization; first stars; galaxies: evolution; ultraviolet: galaxies; HUBBLE-SPACE-TELESCOPE; STAR-FORMING GALAXIES; ULTRA DEEP FIELD; PHOTOMETRIC REDSHIFTS; IONIZING EMISSIVITY; UVUDF ULTRAVIOLET; TO; REIONIZATION; CONSTRAINTS; MODELS;

D O I：

10.1088/2041-8205/814/1/L10

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

The leakage of Lyman continuum (LyC) photons from star-forming galaxies is an elusive parameter. When observed, it provides a wealth of information on star formation in galaxies and on the geometry of the interstellar medium, and puts constraints on the role of star-forming galaxies in the reionization of the universe. H alpha-selected galaxies at z similar to 2 trace the highest star formation population at the peak of cosmic star formation history, providing a base for directly measuring LyC escape. Here we present this method and highlight its benefits as well as caveats. We also use the method on 10 Ha emitters in the Chandra Deep Field South at z = 2.2, also imaged with the Hubble Space Telescope in the ultraviolet. We find no individual LyC detections, and our stack puts a 5 sigma upper limit on the average absolute escape fraction of <24%, consistent with similar studies. With future planned observations, the sample sizes should rapidly increase and the method presented here should provide very robust constraints on the escape fraction.

引用

页数：4

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