Lyman Continuum Escape Fraction in Ly$alpha$ Emitters at $zsimeq3.1$. (arXiv:2001.08241v1 [astro-ph.GA])
<a href="http://arxiv.org/find/astro-ph/1/au:+Bian_F/0/1/0/all/0/1">Fuyan Bian</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Fan_X/0/1/0/all/0/1">Xiaohui Fan</a>

We measure the LyC escape fraction in 54 faint Lyman Alpha Emitters (LAEs) at
$zsimeq3.1$ in the GOODS-South field. With the average magnitude of $R=26.7$
AB ($M_{UV}=-18.8$, $Lsimeq0.1L^*$), these galaxies represent a population of
compact young dwarf galaxies. Their properties are likely to resemble those in
the galaxies responsible for reionising the Universe at $z>6$. We do not detect
LyC emission in any individual LAEs in the deep {em HST} F336W images, which
covers the rest-frame 820r{A}. We do not detect the LyC emission of these LAEs
in the stacked F336W images, either. The $3sigma$ upper limit of LyC escape
fractions is $f_{rm esc}<14-32%$. However, the high Ly$alpha$ rest-frame equivalent width, low stellar mass and UV luminosity of these LAEs suggest that they should have $f_{rm esc}>50%$. The low LyC escape fraction from this work
and other stacking analysis suggest that the LyC leaking galaxies with $f_{rm
esc} > 50%$ at $z=2-3$ do not follow the relation between the $f_{rm esc}$
and UV luminosity and Ly$alpha$ equivalent width (EW) derived from typical
galaxies at similar redshift. Therefore, the UV luminosity and Ly$alpha$
equivalent width (EW) are not the best indicators for the LyC escape fraction.

We measure the LyC escape fraction in 54 faint Lyman Alpha Emitters (LAEs) at
$zsimeq3.1$ in the GOODS-South field. With the average magnitude of $R=26.7$
AB ($M_{UV}=-18.8$, $Lsimeq0.1L^*$), these galaxies represent a population of
compact young dwarf galaxies. Their properties are likely to resemble those in
the galaxies responsible for reionising the Universe at $z>6$. We do not detect
LyC emission in any individual LAEs in the deep {em HST} F336W images, which
covers the rest-frame 820r{A}. We do not detect the LyC emission of these LAEs
in the stacked F336W images, either. The $3sigma$ upper limit of LyC escape
fractions is $f_{rm esc}<14-32%$. However, the high Ly$alpha$ rest-frame
equivalent width, low stellar mass and UV luminosity of these LAEs suggest that
they should have $f_{rm esc}>50%$. The low LyC escape fraction from this work
and other stacking analysis suggest that the LyC leaking galaxies with $f_{rm
esc} > 50%$ at $z=2-3$ do not follow the relation between the $f_{rm esc}$
and UV luminosity and Ly$alpha$ equivalent width (EW) derived from typical
galaxies at similar redshift. Therefore, the UV luminosity and Ly$alpha$
equivalent width (EW) are not the best indicators for the LyC escape fraction.

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