Abstract
We present our analysis of the LyC emission and escape fraction of 111
spectroscopically verified galaxies with and without AGN from
2.26$\,$$<$$\,$$z$$\,$$<$4.3. We extended our ERS sample from
$https://iopscience.iop.org/article/10.3847/1538-4357/aaa3dcSmith\
et\ al.\ 2018$ with 64 galaxies in the GOODS North and South fields using
WFC3/UVIS F225W, F275W, and F336W mosaics we independently drizzled using the
HDUV, CANDELS, and UVUDF data. Among the 17 AGN from the 111 galaxies, one
provided a LyC detection in F275W at $m_AB$$\,$=$\,$23.19$\,$mag
(S/N$\,$$\simeq$$\,$133) and $GALEX$ NUV at
$m_AB$$\,$=$\,$23.77$\,$mag (S/N$\,$$\simeq$$\,$13). We
simultaneously fit $SDSS$ and $Chandra$ spectra of this AGN to an accretion
disk and Comptonization model and find $f_esc$ values of
$f_esc^F275W\!\simeq\!28^+20_-4$% and
$f_esc^NUV\!\simeq\!30^+22_-5$%. For the remaining
110 galaxies, we stack image cutouts that capture their LyC emission using the
F225W, F275W, and F336W data of the GOODS and ERS samples, and both combined,
as well as subsamples of galaxies with and without AGN, and $all$ galaxies. We
find the stack of 17 AGN dominate the LyC production from $łangle
z\rangle$$\,$$\simeq$$\,$2.3$-$4.3 by a factor of $\sim$10 compared to all 94
galaxies without AGN. While the IGM of the early universe may have been
reionized mostly by massive stars, there is evidence that a significant portion
of the ionizing energy came from AGN.
Description
The Lyman Continuum Escape Fraction of Galaxies and AGN in the GOODS Fields
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