Neutral Hydrogen Observations of NGC 891

Details Neutral Hydrogen Observations of NGC 891 Neutral Hydrogen Observations of NGC 891

Aug 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995adil...mr...01r&link_type=abstract

NCSA Astronomy Digital Image Library

Astronomy and Astrophysics

Astronomy

Data Reduction, Emission Spectra, Galactic Structure, H I Regions, H Lines, Hydrogen, Spiral Galaxies, Very Large Array (Vla)

Scientific paper

NGC 891 is a large edge-on Sb galaxy, one of the dominant members of the NGC 1023 group. These observations represent part of a dynamical study of edge-on systems (see reference below). The radio continuum image shows emission out to about 4.5 arcmin, well within the optical disk (R(max)=7.6 arcmin); the radio emission is asymmetric about the nucleus, with a plateau of brighter emission to the north. `Bumps' in the radio continuum are probably associated with spiral arms. There are two bright point sources present: the nucleus, and the extraordinarily luminous radio supernova SN1986J (see reference below). The HI is fairly symmetric about the nucleus within the optical disk, but the extension beyond the optical disk is much more dramatic to the south, and entirely explains the asymmetry seen in the single-dish profile. There are a number of bright `blobs' of HI evident in the channel maps, some of which may be traced through several channels; these probably correspond to spiral arms.

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