Kavli Affiliate: Linhua Jiang
| First 5 Authors: , , , ,
| Summary:
We present a study of Lyman continuum (LyC) emission in a sample of $sim$150
Ly$alpha$ emitters (LAEs) at $zapprox3.1$ in the Subaru-XMM Deep Survey
field. These LAEs were previously selected using the narrowband technique and
spectroscopically confirmed with Ly$alpha$ equivalent widths (EWs) $ge45$
r{A}. We obtain deep UV images using a custom intermediate-band filter $U_{rm
J}$ that covers a wavelength range of $3330 sim 3650$ r{A}, corresponding to
810$sim$890 r{A} in the rest frame. We detect 5 individual LyC galaxy
candidates in the $U_{rm J}$ band, and their escape fractions ($f_{rm esc}$)
of LyC photons are roughly between 40% and 80%. This supports a previous
finding that a small fraction of galaxies may have very high $f_{rm esc}$. We
find that the $f_{rm esc}$ values of the 5 LyC galaxies are not apparently
correlated with other galaxy properties such as Ly$alpha$ luminosity and EW,
UV luminosity and slope, and star-formation rate (SFR). This is partly due to
the fact that these galaxies only represent a small fraction ($sim3$%) of our
LAE sample. For the remaining LAEs that are not detected in $U_{rm J}$, we
stack their $U_{rm J}$-band images and constrain their average $f_{rm esc}$.
The upper limit of the average $f_{rm esc}$ value is about 16%, consistent
with the results in the literature. Compared with the non-LyC LAEs, the LyC
LAEs tend to have higher Ly$alpha$ luminosities, Ly$alpha$ EWs, and SFRs, but
their UV continuum slopes are similar to those of other galaxies.
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