GASKAP-HI Pilot Survey Science III: An unbiased view of cold gas in the Small Magellanic Cloud
GASKAP-HI Pilot Survey Science III: An unbiased view of cold gas in the Small Magellanic Cloud
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GASKAP-HI 试点调查科学 III:小麦哲伦星云中冷气体的公正观点
DOI:
10.1017/pasa.2022.18
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发表时间:
2022
影响因子:
6.3
通讯作者:
Lee, Min-Young
中科院分区:
文献类型:
--
作者:
Dempsey, James;McClure-Griffiths, N. M.;Murray, Claire;Dickey, John M.;Pingel, Nickolas M.;Jameson, Katherine;Dénes, Helga;van Loon, Jacco Th.;Leahy, D.;Lee, Min-Young
We present the first unbiased survey of neutral hydrogen (HI) absorption in the Small Magellanic Cloud (SMC). The survey utilises pilot HI observations with the Australian Square Kilometre Array Pathfinder (ASKAP) telescope as part of the Galactic ASKAP HI (GASKAP-HI) project whose dataset has been processed with the GASKAP-HI absorption pipeline, also described here. This dataset provides absorption spectra towards 229 continuum sources, a 275% increase in the number of continuum sources previously published in the SMC region, as well as an improvement in the quality of absorption spectra over previous surveys of the SMC. Our unbiased view, combined with the closely matched beam size between emission and absorption, reveals a lower cold gas faction (11%) than the 2019 ATCA survey of the SMC and is more representative of the SMC as a whole. We also find that the optical depth varies greatly between the SMC's bar and wing regions. In the bar we find that the optical depth is generally low (correction factor to the optically thin column density assumption of) but increases linearly with column density. In the wing however, there is a wide scatter in optical depth despite a tighter range of column densities.
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DOI:
--
发表时间:
1992
期刊:
影响因子:
--
作者:
J. Dickey;E. Brinks;D. Puche
通讯作者:
D. Puche
影响因子:
8.7
作者:
K. Jameson;N. McClure;Boyang Liu;J. Dickey;L. Staveley;S. Stanimirović;J. Dempsey;Joanne Dawson;H. Dénes;A. Bolatto;Di Li;T. Wong
通讯作者:
T. Wong
影响因子:
4.8
作者:
J. Dempsey;N. McClure;K. Jameson;F. Buckland
通讯作者:
F. Buckland
DOI:
--
发表时间:
2000
期刊:
影响因子:
--
作者:
J. Dickey;U. Mebold;S. Stanimirović;L. Staveley
通讯作者:
L. Staveley
DOI:
--
发表时间:
2006
期刊:
影响因子:
--
作者:
P. Hennebelle;E. Audit
通讯作者:
E. Audit