Reionization is an inhomogeneous process, thought to begin in small ionized
bubbles of the intergalactic medium (IGM) around overdense regions of galaxies.
Recent Lyman-alpha (Ly$\alpha$) studies during the epoch of reionization show
growing evidence that ionized bubbles formed earlier around brighter galaxies,
suggesting higher IGM transmission of Ly$\alpha$ from these galaxies. We
investigate this problem using IR slitless spectroscopy from the Hubble Space
Telescope (HST) Wide-Field Camera 3 (WFC3) G102 grism observations of 148
galaxies selected via photometric redshifts at $6.0<z<8.2$. These galaxies have
spectra extracted from the CANDELS Ly$\alpha$ Emission at Reionization (CLEAR)
survey. We combine the CLEAR data for 275 galaxies with the Keck/DEIMOS+MOSFIRE
dataset from the Texas Spectroscopic Search for Ly$\alpha$ Emission at the End
of Reionization Survey. We then constrain the Ly$\alpha$ equivalent-width (EW)
distribution at $6.0<z<8.2$, which is described by an exponential form,
$dN/dEW\proptoexp(-EW)/W_0$, with the characteristic $e$-folding
scale width ($W_0$). We confirm a significant drop of the Ly$\alpha$ strength
(or $W_0$) at $z>6$. Furthermore, we compare the redshift evolution of $W_0$
between galaxies at different UV luminosities. The UV-bright
($M_UV<-21$, or $L_UV>L^*$) galaxies show weaker evolution
with a decrease of 0.4 ($\pm$0.2) dex in $W_0$ at $z>6$ while UV-faint
($M_UV>-21$, or $L_UV<L^*$) galaxies exhibit a significant
drop by a factor of 0.7-0.8 ($\pm0.2$) dex in $W_0$ from $z<6$ to $z>6$. Our
results add to the accumulating evidence that UV-bright galaxies exhibit
boosted Ly$\alpha$ transmission in the IGM, suggesting that reionization
completes sooner in regions proximate to galaxies of higher UV luminosity.
Description
CLEAR: Boosted Ly$\alpha$ Transmission of the Intergalactic Medium in UV bright Galaxies
%0 Generic
%1 jung2021clear
%A Jung, Intae
%A Papovich, Casey
%A Finkelstein, Steven L.
%A Simons, Raymond C.
%A Estrada-Carpenter, Vicente
%A Backhaus, Bren E.
%A Cleri, Nikko J.
%A Finlator, Kristian
%A Giavalisco, Mauro
%A Ji, Zhiyuan
%A Matharu, Jasleen
%A Momcheva, Ivelina
%A Straughn, Amber N.
%A Trump, Jonathan R.
%D 2021
%K library
%T CLEAR: Boosted Ly$\alpha$ Transmission of the Intergalactic Medium in UV
bright Galaxies
%U http://arxiv.org/abs/2111.14863
%X Reionization is an inhomogeneous process, thought to begin in small ionized
bubbles of the intergalactic medium (IGM) around overdense regions of galaxies.
Recent Lyman-alpha (Ly$\alpha$) studies during the epoch of reionization show
growing evidence that ionized bubbles formed earlier around brighter galaxies,
suggesting higher IGM transmission of Ly$\alpha$ from these galaxies. We
investigate this problem using IR slitless spectroscopy from the Hubble Space
Telescope (HST) Wide-Field Camera 3 (WFC3) G102 grism observations of 148
galaxies selected via photometric redshifts at $6.0<z<8.2$. These galaxies have
spectra extracted from the CANDELS Ly$\alpha$ Emission at Reionization (CLEAR)
survey. We combine the CLEAR data for 275 galaxies with the Keck/DEIMOS+MOSFIRE
dataset from the Texas Spectroscopic Search for Ly$\alpha$ Emission at the End
of Reionization Survey. We then constrain the Ly$\alpha$ equivalent-width (EW)
distribution at $6.0<z<8.2$, which is described by an exponential form,
$dN/dEW\proptoexp(-EW)/W_0$, with the characteristic $e$-folding
scale width ($W_0$). We confirm a significant drop of the Ly$\alpha$ strength
(or $W_0$) at $z>6$. Furthermore, we compare the redshift evolution of $W_0$
between galaxies at different UV luminosities. The UV-bright
($M_UV<-21$, or $L_UV>L^*$) galaxies show weaker evolution
with a decrease of 0.4 ($\pm$0.2) dex in $W_0$ at $z>6$ while UV-faint
($M_UV>-21$, or $L_UV<L^*$) galaxies exhibit a significant
drop by a factor of 0.7-0.8 ($\pm0.2$) dex in $W_0$ from $z<6$ to $z>6$. Our
results add to the accumulating evidence that UV-bright galaxies exhibit
boosted Ly$\alpha$ transmission in the IGM, suggesting that reionization
completes sooner in regions proximate to galaxies of higher UV luminosity.
@misc{jung2021clear,
abstract = {Reionization is an inhomogeneous process, thought to begin in small ionized
bubbles of the intergalactic medium (IGM) around overdense regions of galaxies.
Recent Lyman-alpha (Ly$\alpha$) studies during the epoch of reionization show
growing evidence that ionized bubbles formed earlier around brighter galaxies,
suggesting higher IGM transmission of Ly$\alpha$ from these galaxies. We
investigate this problem using IR slitless spectroscopy from the Hubble Space
Telescope (HST) Wide-Field Camera 3 (WFC3) G102 grism observations of 148
galaxies selected via photometric redshifts at $6.0<z<8.2$. These galaxies have
spectra extracted from the CANDELS Ly$\alpha$ Emission at Reionization (CLEAR)
survey. We combine the CLEAR data for 275 galaxies with the Keck/DEIMOS+MOSFIRE
dataset from the Texas Spectroscopic Search for Ly$\alpha$ Emission at the End
of Reionization Survey. We then constrain the Ly$\alpha$ equivalent-width (EW)
distribution at $6.0<z<8.2$, which is described by an exponential form,
$dN/d\text{EW}\propto\text{exp(-EW)}/W_0$, with the characteristic $e$-folding
scale width ($W_0$). We confirm a significant drop of the Ly$\alpha$ strength
(or $W_0$) at $z>6$. Furthermore, we compare the redshift evolution of $W_0$
between galaxies at different UV luminosities. The UV-bright
($M_{\text{UV}}<-21$, or $L_{\text{UV}}>L^{*}$) galaxies show weaker evolution
with a decrease of 0.4 ($\pm$0.2) dex in $W_0$ at $z>6$ while UV-faint
($M_{\text{UV}}>-21$, or $L_{\text{UV}}<L^{*}$) galaxies exhibit a significant
drop by a factor of 0.7-0.8 ($\pm0.2$) dex in $W_0$ from $z<6$ to $z>6$. Our
results add to the accumulating evidence that UV-bright galaxies exhibit
boosted Ly$\alpha$ transmission in the IGM, suggesting that reionization
completes sooner in regions proximate to galaxies of higher UV luminosity.},
added-at = {2021-12-01T06:52:23.000+0100},
author = {Jung, Intae and Papovich, Casey and Finkelstein, Steven L. and Simons, Raymond C. and Estrada-Carpenter, Vicente and Backhaus, Bren E. and Cleri, Nikko J. and Finlator, Kristian and Giavalisco, Mauro and Ji, Zhiyuan and Matharu, Jasleen and Momcheva, Ivelina and Straughn, Amber N. and Trump, Jonathan R.},
biburl = {https://www.bibsonomy.org/bibtex/2932f38bdc6bfc0440ae41a44ca1963fc/gpkulkarni},
description = {CLEAR: Boosted Ly$\alpha$ Transmission of the Intergalactic Medium in UV bright Galaxies},
interhash = {2e593f205abb36f856a17ce72af387e3},
intrahash = {932f38bdc6bfc0440ae41a44ca1963fc},
keywords = {library},
note = {cite arxiv:2111.14863Comment: 21 pages, 9 figures, 2 tables, 1st revision submitted to ApJ},
timestamp = {2021-12-01T06:52:23.000+0100},
title = {CLEAR: Boosted Ly$\alpha$ Transmission of the Intergalactic Medium in UV
bright Galaxies},
url = {http://arxiv.org/abs/2111.14863},
year = 2021
}