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Title:
The Cold Gaseous Halo of NGC 891
Authors:
Oosterloo, Tom; Fraternali, Filippo; Sancisi, Renzo
Affiliation:
AA(Netherlands Foundation for Research in Astronomy, 7900 AA Dwingeloo ; Kapteyn Institute, 9700 AV Groningen, The Netherlands), AB(Department of Astronomy, University of Bologna, I-40127 Bologna, Italy ), AC(INAF-Osservatorio di Bologna, I-40127 Bologna, Italy ; Kapteyn Institute, 9700 AV Groningen, The Netherlands)
Publication:
The Astronomical Journal, Volume 134, Issue 3, pp. 1019 (2007). (AJ Homepage)
Publication Date:
09/2007
Origin:
IOP
DOI:
10.1086/520332
Bibliographic Code:
2007AJ....134.1019O

Abstract

We present H I observations of the edge-on galaxy NGC 891. These are among the deepest ever performed on an external galaxy. They reveal a huge gaseous halo, much more extended than seen previously and containing almost 30% of the H I. This H I halo shows structures on various scales. On one side, there is a filament extending (in projection) up to 22 kpc vertically from the disk. Small (M gtrsim 106 Modot) halo clouds, some with forbidden (apparently counterrotating) velocities, are also detected. The overall kinematics of the halo gas is characterized by differential rotation lagging with respect to that of the disk. The lag, more pronounced at small radii, increases with height from the plane. There is evidence that a significant fraction of the halo is due to a galactic fountain. Accretion from intergalactic space may also play a role in building up the halo and providing the low angular momentum material needed to account for the observed rotation lag. The long H I filament and the counterrotating clouds may be direct evidence of such accretion.
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