%0 Generic %1 saxena2021strong %A Saxena, A. %A Pentericci, L. %A Ellis, R. S. %A Guaita, L. %A Calabrò, A. %A Schaerer, D. %A Vanzella, E. %A Amorín, R. %A Bolzonella, M. %A Castellano, M. %A Fontanot, F. %A Hathi, N. P. %A Hibon, P. %A Llerena, M. %A Mannucci, F. %A Saldana-Lopez, A. %A Talia, M. %A Zamorani, G. %D 2021 %K library %T No strong dependence of Lyman continuum leakage on physical properties of star-forming galaxies at $3.1 z 3.5$ %U http://arxiv.org/abs/2109.03662 %X 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 the SED fitting. After removing foreground contaminants, we report the discovery of 11 new candidate LyC leakers, with absolute LyC escape fractions, $f_esc$ in the range $0.07-0.52$. Most galaxies in our sample ($\approx94\%$) do not show any LyC leakage, and we place $1\sigma$ upper limits of $f_esc < 0.07$ through weighted averaging, where the Lyman-break selected galaxies have $f_esc < 0.07$ and `blindly' discovered galaxies with no prior photometric selection have $f_esc < 0.10$. We additionally measure $f_esc < 0.09$ for extreme emission line galaxies in our sample with rest-frame O\,iii\,+\,H$\beta$ equivalent widths $>300$\,\AA. For the candidate LyC leakers, we do not find a strong dependence of $f_esc$ on their stellar masses and/or specific star-formation rates, and no correlation between $f_esc$ and EW$_0$(O\,iii\,+\,H$\beta$). We suggest that this lack of correlations may be explained by viewing angle and/or non-coincident timescales of starburst activity and periods of high $f_esc$. Alternatively, escaping radiation may predominantly occur in highly localised star-forming regions, thereby obscuring any global trends with galaxy properties. Both hypotheses have important consequences for models of reionisation.

@misc{saxena2021strong, 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\,\textsc{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 $0.07-0.52$. Most galaxies in our sample ($\approx94\%$) do not show any LyC leakage, and we place $1\sigma$ upper limits of $f_{\rm{esc}} < 0.07$ through weighted averaging, where the Lyman-break selected galaxies have $f_{\rm{esc}} < 0.07$ and `blindly' discovered galaxies with no prior photometric selection have $f_{\rm{esc}} < 0.10$. We additionally measure $f_{\rm{esc}} < 0.09$ for extreme emission line galaxies in our sample with rest-frame [O\,\textsc{iii}]\,+\,H$\beta$ equivalent widths $>300$\,\AA. For the candidate LyC leakers, we do not find a strong dependence of $f_{\rm{esc}}$ on their stellar masses and/or specific star-formation rates, and no correlation between $f_{\rm{esc}}$ and EW$_0$([O\,\textsc{iii}]\,+\,H$\beta$). We suggest that this lack of correlations may be explained by viewing angle 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, thereby obscuring any global trends with galaxy properties. Both hypotheses have important consequences for models of reionisation.}, added-at = {2021-09-09T07:54:35.000+0200}, author = {Saxena, A. and Pentericci, L. and Ellis, R. S. and Guaita, L. and Calabrò, A. and Schaerer, D. and Vanzella, E. and Amorín, R. and Bolzonella, M. and Castellano, M. and Fontanot, F. and Hathi, N. P. and Hibon, P. and Llerena, M. and Mannucci, F. and Saldana-Lopez, A. and Talia, M. and Zamorani, G.}, biburl = {https://www.bibsonomy.org/bibtex/20679cb2366cc9a4ab2500306f97a48a4/gpkulkarni}, description = {No strong dependence of Lyman continuum leakage on physical properties of star-forming galaxies at $\mathbf{3.1 \lesssim z \lesssim 3.5}$}, interhash = {a12e789441bfed2253021a410b5d831f}, intrahash = {0679cb2366cc9a4ab2500306f97a48a4}, keywords = {library}, note = {cite arxiv:2109.03662Comment: 18 pages, 11 figures, 1 appendix, submitted to Monthly Notices of the Royal Astronomical Society}, timestamp = {2021-09-09T07:54:35.000+0200}, title = {No strong dependence of Lyman continuum leakage on physical properties of star-forming galaxies at $\mathbf{3.1 \lesssim z \lesssim 3.5}$}, url = {http://arxiv.org/abs/2109.03662}, year = 2021 }