Constraints on the gas masses of low-z damped Lyman-$\alpha$ systems
P. Mazumdar, N. Kanekar, and J. Prochaska. (2014)cite arxiv:1406.0991Comment: 5 pages, 4 figures; accepted for publication in MNRAS (Letters).
Abstract
We report a deep search for redshifted HI 21 cm emission from three damped
and sub-damped Lyman-$\alpha$ absorbers (DLAs) at $z 0.1$ with the
Green Bank Telescope (GBT). No evidence for a redshifted HI 21 cm emission
signal was obtained in the GBT spectra of two absorbers, with the data on the
third rendered unusable by terrestrial interference. The non-detections of HI
21 cm emission yield strong constraints on the HI masses of the associated
galaxies, M$_HI < 2.3 10^9 (\Delta V/100)^1/2$ M$_ødot$
for the sub-DLA at $z = 0.0830$ towards J1553+3548, and M$_HI < 2.7
10^9 (\Delta V/100)^1/2$ M$_ødot$ for the DLA at $z = 0.0963$
towards J1619+3342, where $\Delta V$ is the HI 21 cm line width, in km
s$^-1$. This continues the trend of low HI masses found in all low-$z$ DLAs
and sub-DLAs that have been searched for redshifted HI 21 cm emission.
Low-redshift absorbers with relatively low HI column densities, $few
10^20$ cm$^-2$, thus do not typically arise in massive gas-rich
galaxies.
Description
[1406.0991] Constraints on the gas masses of low-z damped Lyman-$\alpha$ systems
%0 Generic
%1 mazumdar2014constraints
%A Mazumdar, Parichay
%A Kanekar, Nissim
%A Prochaska, J. Xavier
%D 2014
%K dlas gas low masses
%T Constraints on the gas masses of low-z damped Lyman-$\alpha$ systems
%U http://arxiv.org/abs/1406.0991
%X We report a deep search for redshifted HI 21 cm emission from three damped
and sub-damped Lyman-$\alpha$ absorbers (DLAs) at $z 0.1$ with the
Green Bank Telescope (GBT). No evidence for a redshifted HI 21 cm emission
signal was obtained in the GBT spectra of two absorbers, with the data on the
third rendered unusable by terrestrial interference. The non-detections of HI
21 cm emission yield strong constraints on the HI masses of the associated
galaxies, M$_HI < 2.3 10^9 (\Delta V/100)^1/2$ M$_ødot$
for the sub-DLA at $z = 0.0830$ towards J1553+3548, and M$_HI < 2.7
10^9 (\Delta V/100)^1/2$ M$_ødot$ for the DLA at $z = 0.0963$
towards J1619+3342, where $\Delta V$ is the HI 21 cm line width, in km
s$^-1$. This continues the trend of low HI masses found in all low-$z$ DLAs
and sub-DLAs that have been searched for redshifted HI 21 cm emission.
Low-redshift absorbers with relatively low HI column densities, $few
10^20$ cm$^-2$, thus do not typically arise in massive gas-rich
galaxies.
@misc{mazumdar2014constraints,
abstract = {We report a deep search for redshifted HI 21 cm emission from three damped
and sub-damped Lyman-$\alpha$ absorbers (DLAs) at $z \approx 0.1$ with the
Green Bank Telescope (GBT). No evidence for a redshifted HI 21 cm emission
signal was obtained in the GBT spectra of two absorbers, with the data on the
third rendered unusable by terrestrial interference. The non-detections of HI
21 cm emission yield strong constraints on the HI masses of the associated
galaxies, M$_{\rm HI} < 2.3 \times 10^9 \times (\Delta V/100)^{1/2}$ M$_\odot$
for the sub-DLA at $z = 0.0830$ towards J1553+3548, and M$_{\rm HI} < 2.7
\times 10^9 \times (\Delta V/100)^{1/2}$ M$_\odot$ for the DLA at $z = 0.0963$
towards J1619+3342, where $\Delta V$ is the HI 21 cm line width, in km
s$^{-1}$. This continues the trend of low HI masses found in all low-$z$ DLAs
and sub-DLAs that have been searched for redshifted HI 21 cm emission.
Low-redshift absorbers with relatively low HI column densities, $\lesssim few
\times 10^{20}$ cm$^{-2}$, thus do not typically arise in massive gas-rich
galaxies.},
added-at = {2014-06-05T09:52:32.000+0200},
author = {Mazumdar, Parichay and Kanekar, Nissim and Prochaska, J. Xavier},
biburl = {https://www.bibsonomy.org/bibtex/218779c2aa41a1842e8c839a5f6b5911a/miki},
description = {[1406.0991] Constraints on the gas masses of low-z damped Lyman-$\alpha$ systems},
interhash = {0be8eb841a1292a93be7595e3b2961dc},
intrahash = {18779c2aa41a1842e8c839a5f6b5911a},
keywords = {dlas gas low masses},
note = {cite arxiv:1406.0991Comment: 5 pages, 4 figures; accepted for publication in MNRAS (Letters)},
timestamp = {2014-06-05T09:52:32.000+0200},
title = {Constraints on the gas masses of low-z damped Lyman-$\alpha$ systems},
url = {http://arxiv.org/abs/1406.0991},
year = 2014
}