We present the study of a sample of nine QSO fields, with damped-Ly-alpha
(DLA) or sub-DLA systems at z~0.6, observed with the X-Shooter spectrograph at
the Very Large Telescope. By suitably positioning the X-Shooter slit based on
high spatial resolution images of HST/ACS we are able to detect absorbing
galaxies in 7 out of 9 fields (~ 78\% success rate) at impact parameters from
10 to 30 kpc. In 5 out of 7 fields the absorbing galaxies are confirmed via
detection of multiple emission lines at the redshift of DLAs where only 1 out
of 5 also emits a faint continuum. In 2 out of these 5 fields we detect a
second galaxy at the DLA redshift. Extinction corrected star formation rates
(SFR) of these DLA-galaxies, estimated using their H-alpha fluxes, are in the
range 0.3-6.7 M_sun yr^-1. The emission metallicities of these five
DLA-galaxies are estimated to be from 0.2 to 0.9 Z_sun. Based on the Voigt
profile fits to absorption lines we find the metallicity of the absorbing
neutral gas to be in a range of 0.05--0.6 Z_sun. The two remaining DLA-galaxies
are quiescent galaxies with SFR < 0.4 M_sun yr^-1 (3-sigma) presenting
continuum emission but weak or no emission lines. Using X-Shooter spectrum we
estimate i-band absolute magnitude of -19.5+/-0.2 for both these DLA-galaxies
that indicates they are sub-L* galaxies. Comparing our results with that of
other surveys in the literature we find a possible redshift evolution of the
SFR of DLA-galaxies.
Description
[1609.03843] A study of the circum-galactic medium at z ~ 0.6 using DLA-galaxies
%0 Generic
%1 rahmani2016study
%A Rahmani, Hadi
%A Peroux, Celine
%A Turnshek, David A.
%A Rao, Sandhya M.
%A Quiret, Samuel
%A Hamilton, Timothy S.
%A Kulkarni, Varsha P.
%A Monier, Eric M.
%D 2016
%K dla galaxies host low-z
%T A study of the circum-galactic medium at z ~ 0.6 using DLA-galaxies
%U http://arxiv.org/abs/1609.03843
%X We present the study of a sample of nine QSO fields, with damped-Ly-alpha
(DLA) or sub-DLA systems at z~0.6, observed with the X-Shooter spectrograph at
the Very Large Telescope. By suitably positioning the X-Shooter slit based on
high spatial resolution images of HST/ACS we are able to detect absorbing
galaxies in 7 out of 9 fields (~ 78\% success rate) at impact parameters from
10 to 30 kpc. In 5 out of 7 fields the absorbing galaxies are confirmed via
detection of multiple emission lines at the redshift of DLAs where only 1 out
of 5 also emits a faint continuum. In 2 out of these 5 fields we detect a
second galaxy at the DLA redshift. Extinction corrected star formation rates
(SFR) of these DLA-galaxies, estimated using their H-alpha fluxes, are in the
range 0.3-6.7 M_sun yr^-1. The emission metallicities of these five
DLA-galaxies are estimated to be from 0.2 to 0.9 Z_sun. Based on the Voigt
profile fits to absorption lines we find the metallicity of the absorbing
neutral gas to be in a range of 0.05--0.6 Z_sun. The two remaining DLA-galaxies
are quiescent galaxies with SFR < 0.4 M_sun yr^-1 (3-sigma) presenting
continuum emission but weak or no emission lines. Using X-Shooter spectrum we
estimate i-band absolute magnitude of -19.5+/-0.2 for both these DLA-galaxies
that indicates they are sub-L* galaxies. Comparing our results with that of
other surveys in the literature we find a possible redshift evolution of the
SFR of DLA-galaxies.
@misc{rahmani2016study,
abstract = {We present the study of a sample of nine QSO fields, with damped-Ly-alpha
(DLA) or sub-DLA systems at z~0.6, observed with the X-Shooter spectrograph at
the Very Large Telescope. By suitably positioning the X-Shooter slit based on
high spatial resolution images of HST/ACS we are able to detect absorbing
galaxies in 7 out of 9 fields (~ 78\% success rate) at impact parameters from
10 to 30 kpc. In 5 out of 7 fields the absorbing galaxies are confirmed via
detection of multiple emission lines at the redshift of DLAs where only 1 out
of 5 also emits a faint continuum. In 2 out of these 5 fields we detect a
second galaxy at the DLA redshift. Extinction corrected star formation rates
(SFR) of these DLA-galaxies, estimated using their H-alpha fluxes, are in the
range 0.3-6.7 M_sun yr^-1. The emission metallicities of these five
DLA-galaxies are estimated to be from 0.2 to 0.9 Z_sun. Based on the Voigt
profile fits to absorption lines we find the metallicity of the absorbing
neutral gas to be in a range of 0.05--0.6 Z_sun. The two remaining DLA-galaxies
are quiescent galaxies with SFR < 0.4 M_sun yr^-1 (3-sigma) presenting
continuum emission but weak or no emission lines. Using X-Shooter spectrum we
estimate i-band absolute magnitude of -19.5+/-0.2 for both these DLA-galaxies
that indicates they are sub-L* galaxies. Comparing our results with that of
other surveys in the literature we find a possible redshift evolution of the
SFR of DLA-galaxies.},
added-at = {2016-09-14T09:40:39.000+0200},
author = {Rahmani, Hadi and Peroux, Celine and Turnshek, David A. and Rao, Sandhya M. and Quiret, Samuel and Hamilton, Timothy S. and Kulkarni, Varsha P. and Monier, Eric M.},
biburl = {https://www.bibsonomy.org/bibtex/266a392861febf666fd0f4d319614225a/miki},
description = {[1609.03843] A study of the circum-galactic medium at z ~ 0.6 using DLA-galaxies},
interhash = {b00975c5dc62e904560a15be88d60ad9},
intrahash = {66a392861febf666fd0f4d319614225a},
keywords = {dla galaxies host low-z},
note = {cite arxiv:1609.03843Comment: MNRAS accepted},
timestamp = {2016-09-14T09:40:39.000+0200},
title = {A study of the circum-galactic medium at z ~ 0.6 using DLA-galaxies},
url = {http://arxiv.org/abs/1609.03843},
year = 2016
}