A molecular spur in the edge-on galaxy NGC 891

Details A molecular spur in the edge-on galaxy NGC 891 A molecular spur in the edge-on galaxy NGC 891

Oct 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992pasj...44l.227h&link_type=abstract

PASJ: Publications of the Astronomical Society of Japan (ISSN 0004-6264), vol. 44, no. 5, p. L227-L230.

Other

18

Galactic Halos, Galactic Structure, Interstellar Gas, Spiral Galaxies, Molecular Gases, Star Formation

Scientific paper

The nearest edge-on galaxy, NGC 891, was observed with the Nobeyama Millimeter Array in the CO (J = 1-0) line. A prominent spur structure of molecular gas emerging vertically from the disk was found at 5.5 kpc from the center of the galaxy. The height of the spur from the galactic disk is 520 pc, and its velocity width is narrower than 20 km/s. This is the first detection of vertical features of a molecular line in galaxies other than of those associated with nuclear activity. It provides direct evidence of molecular-gas exchange between the disk and halo. The molecular-gas mass of the spur is 3 x 10 exp 7 solar masses and its gravitational potential enery is 3 x 10 exp 52 erg. This spur may be ejected from the galactic disk due to a superbubble or formed by means of the Parker instability, even though some shortage is indicated in each model.

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