A DETECTION OF GAS ASSOCIATED WITH THE M31 STELLAR STREAM
A DETECTION OF GAS ASSOCIATED WITH THE M31 STELLAR STREAM
复制标题
与 M31 恒星流相关的气体的检测
DOI:
10.1088/0004-637x/807/2/153
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发表时间:
2015
期刊:
影响因子:
--
通讯作者:
Keeney
中科院分区:
文献类型:
--
作者:
Danforth;Keeney
Detailed studies of stellar populations in the halos of the Milky Way and the Andromeda (M31) galaxies have shown increasing numbers of tidal streams and dwarf galaxies, attesting to a complicated and on-going process of hierarchical structure formation. The most prominent feature in the halo of M31 is the Giant Stellar Stream, a structure∼ 4 fdg 5 in extent along the sky, which is close to, but not coincident with the galaxy's minor axis. The stars that make up this stream are kinematically and chemically distinct from the other stars in the halo. Here, we present Hubble Space Telescope/Cosmic Origins Spectrograph high-resolution ultraviolet absorption spectra of three active galactic nuclei sight lines which probe the M31 halo, including one that samples gas in the main southwestern portion of the Giant Stream. We see two clear absorption components in many metal species at velocities typical of the M31 halo and a third, blueshifted component which arises in the stream. Photoionization modeling of the column density ratios in the different components shows gas in an ionization state typical of that seen in other galaxy halo environments and suggests solar to slightly super-solar metallicity, consistent with previous findings from stellar spectroscopy.
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DOI:
10.1086/341175
发表时间:
2002-03
期刊:
The Astronomical Journal
影响因子:
--
作者:
D. Reitzel;P. Guhathakurta
通讯作者:
D. Reitzel;P. Guhathakurta
DOI:
--
发表时间:
2014
期刊:
影响因子:
--
作者:
N. Lehner;C. Howk;B. Wakker
通讯作者:
B. Wakker
影响因子:
6.5
作者:
B. Hendricks;A. Koch;M. Walker;Christian I. Johnson;J. Peñarrubia;G. Gilmore
通讯作者:
G. Gilmore
DOI:
--
发表时间:
2011
期刊:
影响因子:
--
作者:
J. Shull;Matthew L. Stevans;C. Danforth;S. Penton;F. J. Lockman;N. Arav
通讯作者:
N. Arav
DOI:
--
发表时间:
2007
期刊:
影响因子:
--
作者:
J. Stocke;C. Danforth;J. Shull;S. Penton;M. Giroux
通讯作者:
M. Giroux