NASA/IPAC EXTRAGALACTIC DATABASE
Date and Time of the Query: 2019-06-20 T07:18:38 PDT
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For refcode 1993A&A...273L..31K:
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Copyright by European Southern Observatory (ESO). Reproduced by permission
1993A&A...273L..31K Letter to the Editor Widespread high velocity gas in the spiral galaxy NGC 6946 J. Kamphuis and R. Sancisi Kapteyn Astronomical Institute, Postbus 800, NL-9700 AV Groningen. The Netherlands Received March 18, accepted April 2, 1993 Abstract. 21-cm line observations of the nearly face-on Sc galaxy NGC 6946 show HI at high velocities of up to +/-100 km sec^-1^ with respect to the differentially rotating disk. Although the mass of the high-velocity component is only about 5 10^8^ M_sun_ - just a few percent of the total HI mass of NGC 6946 - its total kinetic energy is about 10^55^ erg, comparable to the total kinetic energy in the random motions of the HI disk. This "high velocity" HI is predominantly seen in the direction of the bright optical disk and near the holes in the HI distribution. It is likely to be located in the halo and swept up from the disk by stellar winds and supernovae. It may be similar to the neutral gas found in the halo of our Galaxy and to the filaments and loops of ionized gas recently seen up to a few kpc from the plane in edge-on galaxies. Key words: Galaxies: individual; NGC 6946, Interstellar Medium: clouds: high velocity, Radio lines: 21-cm
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