No strong dependence of Lyman continuum leakage on physical properties of star-forming galaxies at ≲ z ≲ 3.5

被引：36

作者：

Saxena, A. ^{[1
]}

Pentericci, L. ^{[2
]}

Ellis, R. S. ^{[1
]}

Guaita, L. ^{[3
]}

Calabro, A. ^{[2
]}

Schaerer, D. ^{[4
,5
]}

Vanzella, E. ^{[6
]}

Amorin, R. ^{[7
,8
]}

Bolzonella, M. ^{[9
]}

Castellano, M. ^{[2
]}

Fontanot, F. ^{[10
,11
]}

Hathi, N. P. ^{[12
]}

Hibon, P. ^{[13
]}

Llerena, M. ^{[8
]}

Mannucci, F. ^{[14
]}

Saldana-Lopez, A. ^{[4
]}

Talia, M. ^{[15
]}

Zamorani, G. ^{[9
]}

机构：

[1] UCL, Dept Phys & Astron, Gower St, London WC1E 6BT, England

[2] INAF Osservatorio Astron Roma, Via Frascati 33, I-00078 Monte Porzio Catone, Italy

[3] Univ Andres Bello, Dept Ciencias Fis, Fernandez Concha 700, Santiago, Chile

[4] Univ Geneva, Dept Astron, Observ Geneve, 51 Chemin Pegasi, CH-1290 Versoix, Switzerland

[5] IRAP, CNRS, 14 Ave E Belin, F-31400 Toulouse, France

[6] INAF Osservatorio Astron Bologna, Via P Gobetti 93-3, I-40129 Bologna, Italy

[7] Univ La Serena, Inst Invest Multidisciplinar Ciencia & Tecnol, La Serena 1305, Chile

[8] Univ La Serena, Dept Fis & Astron, Av Juan Cisternas 1200 Norte, La Serena, Chile

[9] INAF Osservatorio Astrofis & Sci Spazio Bologna, Via Piero Gobetti 93-3, I-40129 Bologna, Italy

[10] INAF Astron Observ Trieste, Via GB Tiepolo 11, I-34143 Trieste, Italy

[11] IFPU Inst Fundamental Phys Universe, Via Beirut 2, I-34151 Trieste, Italy

[12] Space Telescope Sci Inst, 3700 San Martin Dr, Baltimore, MD 21218 USA

[13] European Southern Observ ESO, Alonso de Cordova 3107, Santiago 19001, Chile

[14] INAF Osservatorio Astrofis Arcetri, Largo E Fermi 5, I-50125 Florence, Italy

[15] Univ Bologna, Dept Phys & Astron Augusto Righi DIFA, Via Gobetti 93-2, I-40129 Bologna, Italy

来源：

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY | 2022年 / 511卷 / 01期

基金：

瑞士国家科学基金会; 欧洲研究理事会;

关键词：

galaxies: evolution; galaxies: high-redshift; dark ages; reionization; first stars; early Universe; HUBBLE-SPACE-TELESCOPE; ESCAPE FRACTION; IONIZING-RADIATION; SPECTROSCOPIC SURVEY; EMITTING GALAXIES; DATA REDUCTION; III EMITTERS; DATA RELEASE; EMISSION; REDSHIFT;

D O I：

10.1093/mnras/stab3728

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We present Lyman continuum (LyC) radiation escape fraction (f(esc)) measurements for 183 spectroscopically confirmed star-forming galaxies in the redshift range 3.11 < z < 3.53 in the Chandra Deep Field South. We use ground-based imaging to measure f(esc), and use ground- and space-based photometry to derive galaxy physical properties using spectral energy distribution (SED) fitting. We additionally derive [O iii] + H beta equivalent widths (that fall in the observed K band) by including nebular emission in SED fitting. After removing foreground contaminants, we report the discovery of 11 new candidate LyC leakers at greater than or similar to 2 sigma level, with f(esc) in the range 0.14-0.85. From non-detections, we place 1 sigma upper limits of f(esc) <0.12, where the Lyman-break selected galaxies have f(esc) f(esc) f(esc) iii] + H beta equivalent widths >300 angstrom. For candidate LyC leakers, we find a weak negative correlation between f(esc) and galaxy stellar masses, no correlation between f(esc) and specific star-formation rates (sSFRs) and a positive correlation between f(esc) and EW0([O iii] + H beta). The weak/no correlations between stellar mass and sSFRs may be explained by misaligned viewing angles and/or non-coincident time-scales of starburst activity and periods of high f(esc). Alternatively, escaping radiation may predominantly occur in highly localized star-forming regions, or f(esc) measurements may be impacted by stochasticity of the intervening neutral medium, obscuring any global trends with galaxy properties. These hypotheses have important consequences for models of reionization.

引用

页码：120 / 138

页数：19

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