A survey of HI gas toward the Andromeda Galaxy
A survey of HI gas toward the Andromeda Galaxy
复制标题
对仙女座星系的 HI 气体的调查
DOI:
10.1051/0004-6361/201526395
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发表时间:
2016
期刊:
影响因子:
--
通讯作者:
Winkel B.
中科院分区:
文献类型:
--
作者:
Kerp J;Kalberla P.M.W;Ben Bekhti N;Flöer L;Winkel B.
ContextThe subsequent coalescence of low-mass halos over cosmic time is thought to be the major formation channel of massive spiral galaxies like the Milky Way and the Andromeda galaxy (M 31). The gaseous halo of a massive galaxy is considered to be the reservoir of baryonic matter persistently fueling the star formation in the disk. Because of its proximity, M 31 is the ideal object for studying the structure of the halo gas in great detail.AimsUsing the latest neutral atomic hydrogen (HI) data of the Effelsberg-Bonn HI Survey (EBHIS) allows comprising a comprehensive inventory of gas associated with M 31. The primary aim is to differentiate between physical structures belonging to the Milky Way Galaxy and M 31 and accordingly to test the presence of a M 31 neutral gaseous halo.MethodsAnalyzing the spatially fully sampled EBHIS data makes it feasible to trace coherent HI structures in space and radial velocity. To disentangle Milky Way and M 31 HI emission we use a new approach, along with the traditional path of setting an upper radial velocity limit, by calculating a difference second moment map.ResultsWe argue that M 31’s disk is physically connected to an asymmetric HI halo of tens of kpc size, the M 31 cloud. We confirm the presence of a coherent low-velocity HI filament located in between M 31 and M 33 aligned at the sky with the clouds at systemic velocity. The physical parameters of the HI filament are comparable to those of the HI clouds at systemic velocity. We also detected an irregularly shaped HI cloud that is is positionally located close to but offset from the stellar body of And XIX.
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DOI:
10.1088/2041-8205/795/1/l5
发表时间:
2014
期刊:
The Astrophysical Journal Letters
影响因子:
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作者:
K. Spekkens;N. Urbancic;B. Mason;B. Willman;J. Aguirre
通讯作者:
J. Aguirre
DOI:
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发表时间:
2014
期刊:
影响因子:
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作者:
N. Lehner;C. Howk;B. Wakker
通讯作者:
B. Wakker
DOI:
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发表时间:
1975
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影响因子:
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作者:
R. Davies
通讯作者:
R. Davies
DOI:
10.1088/0004-637x/768/2/172
发表时间:
2013-02
期刊:
The Astrophysical Journal
影响因子:
--
作者:
M. Collins;S. Chapman;R. Rich;R. Ibata;N. Martin;N. Martin;M. Irwin;N. Bate;G. Lewis;J. Peñarrubia;J. Peñarrubia;N. Arimoto;N. Arimoto;C. Casey;A. Ferguson;A. Koch;A. McConnachie;N. Tanvir
通讯作者:
M. Collins;S. Chapman;R. Rich;R. Ibata;N. Martin;N. Martin;M. Irwin;N. Bate;G. Lewis;J. Peñarrubia;J. Peñarrubia;N. Arimoto;N. Arimoto;C. Casey;A. Ferguson;A. Koch;A. McConnachie;N. Tanvir
DOI:
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发表时间:
2005
期刊:
影响因子:
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作者:
W. Siemer;T. Lauber;Lisa Chase;D. Decker;R. McPeake;C. Jacobson
通讯作者:
C. Jacobson