Extra-planar Hi in the starburst galaxy NGC 253

被引：0

作者：

Boomsma, R. ^{[1
]}

Oosterloo, T.A. ^{[2
]}

Fraternali, F. ^{[2
,3
]}

Van Der Hulst, J.M. ^{[1
]}

Sancisi, R. ^{[1
,4
]}

机构：

[1] Kapteyn Astronomical Institute, PO Box 800, 9700 AV Groningen, Netherlands

[2] ASTRON, Dwingeloo, Netherlands

[3] Theoretical Physics, University of Oxford, United Kingdom

[4] INAF, Osservatorio Astronomico di Bologna, Bologna, Italy

来源：

Astronomy and Astrophysics | 1600年 / 431卷 / 01期

关键词：

Galaxies:; individual; -; Halos; galaxies; ISM; NGC; 253; Structure;

D O I：

暂无

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学科分类号：

摘要：

Observations of the nearby starburst galaxy NGC 253 in the 21-cm line reveal the presence of neutral hydrogen in the halo, up to 12 kpc from the galactic plane. This extra-planar H I is found in only one half of the galaxy and is concentrated in a half-ring structure and plumes which are lagging in rotation with respect to the disk. The H I plumes are seen bordering the bright Ha and X-ray halo emission. It is likely that, as proposed earlier for the Hα and the X-rays, the origin of the extra-planar H I is also related to the central starburst and to the active star formation in the disk. A minor merger and gas accretion are also discussed as possible explanations. The H I disk is less extended than the stellar disk. This may be the result of ionization of its outer parts or, alternatively, of tidal or ram pressure stripping.

引用

页码：65 / 72