The Lyman Continuum Escape Fraction of Galaxies and AGN in the GOODS
  Fields
  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 Smith et al. (2018; arXiv:1602.01555) 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 $\langle z\rangle\simeq 2.3-4.3$ 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.
