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http://hdl.handle.net/20.500.12386/31895
Title: | No strong dependence of Lyman continuum leakage on physical properties of star-forming galaxies at ≲ z ≲ 3.5 | Authors: | Saxena, A. PENTERICCI, Laura Ellis, R. S. Guaita, L. Calabrò, A. Schaerer, D. VANZELLA, Eros Amorín, R. BOLZONELLA, MICOL Castellano, M. Fontanot, F. Hathi, N. P. Hibon, P. Llerena, M. MANNUCCI, FILIPPO Saldana-Lopez, A. Talia, M. Zamorani, G. |
Issue Date: | 2022 | Journal: | MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY | Number: | 511 | Issue: | 1 | First Page: | 120 | Abstract: | We present Lyman continuum (LyC) radiation escape fraction $f_{\rm{esc}}$ measurements for 183 spectroscopically confirmed star-forming galaxies in the redshift range $3.11 < z < 3.53$ in the \textit{Chandra} Deep Field South. We use ground-based imaging to measure $f_{\rm{esc}}$, 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 the SED fitting. After removing foreground contaminants, we report the discovery of 11 new candidate LyC leakers, with absolute LyC escape fractions, $f_{\rm{esc}}$ in the range $0.14-0.85$. From non-detections, we place $1\sigma$ upper limits of $f_{\rm{esc}}<0.12$, where the Lyman-break selected galaxies have $f_{\rm{esc}} < 0.11$ and `blindly' discovered galaxies with no prior photometric selection have $f_{\rm{esc}}<0.13$. We find a slightly higher $1\sigma$ limit of $f_{\rm{esc}}<0.20$ for extreme emission line galaxies with rest-frame [O III]+H$\beta$ equivalent widths $>300$A. For candidate LyC leakers, we find a weak negative correlation between $f_{\rm{esc}}$ and galaxy stellar masses, no correlation between $f_{\rm{esc}}$ specific star-formation rates (sSFRs) and a positive correlation between $f_{\rm{esc}}$ and EW$_0$([O III]+H$\beta$). The weak/no correlations between stellar mass and sSFRs may be explained by misaligned viewing angles and/or non-coincident timescales of starburst activity and periods of high $f_{\rm{esc}}$. Alternatively, escaping radiation may predominantly occur in highly localised star-forming regions, or $f_{\rm{esc}}$ 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 reionisation. | URI: | http://hdl.handle.net/20.500.12386/31895 | URL: | https://academic.oup.com/mnras/article/511/1/120/6481640?login=true http://arxiv.org/abs/2109.03662v2 |
ISSN: | 0035-8711 | DOI: | 10.1093/mnras/stab3728 | Fulltext: | open |
Appears in Collections: | 1.01 Articoli in rivista |
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Saxena22.pdf | Pdf editoriale | 3.17 MB | Adobe PDF | View/Open |
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