LyC Leakers in the AstroSat UV Deep Field: Extreme UV emitters at the Cosmic Noon
arxiv(2024)
Abstract
We report the direct detection of Lyman Continuum (LyC) emission from 9
galaxies and 1 Active Galactic Nuclei (AGN) at z ∼ 1.1-1.6 in the
GOODS-North field using deep observations from the Ultraviolet Imaging
Telescope (UVIT) onboard AstroSat. The absolute escape fraction of the sources
estimated from the far-ultraviolet (FUV) and Hα line luminosities using
Monte Carlo (MC) analysis of two Inter-Galactic Medium (IGM) models span a
range ∼ 10 - 55 %. The restframe UV wavelength of the sources falls in
the extreme-ultraviolet (EUV) regime ∼ 550-700 Å, the shortest LyC
wavelength range probed so far. This redshift range remains devoid of direct
detections of LyC emission due to the instrumental limitations of previously
available facilities. With UVIT having a very low detector noise, each of these
sources are detected with an individual signal-to-noise ratio (SNR) > 3 while
for the stack of six sources, we achieve an SNR ∼ 7.4. The LyC emission is
seen to be offset from the optical centroids and extended beyond the UVIT PSF
of 1.^''6 in most of the sources. This sample fills an important
niche between GALEX and Cosmic Origins Spectrograph (COS) at low-z, and HST
WFC3 at high-z and is crucial in understanding the evolution of LyC leakers.
MoreTranslated text
AI Read Science
Must-Reading Tree
Example
Generate MRT to find the research sequence of this paper
Chat Paper
Summary is being generated by the instructions you defined