Abstract: High and low dispersion optical spectra of the giant H II region CM 67 near the center of the edge-on galaxy NGC 4631 have been obtained. Comparisons are made with radio observations to suggest the existence of a large bar in NGC 4631. Region CM 67 is shown to coincide in position with the eastern- most peak of a triple radio-continuum source. It also corresponds very closely with a giant molecular cloud in the CO position-velocity diagram. It is concluded that the optical, nonthermal radio continuum, and CO line emission originate from the same volume of gas. The H II region is typical of high excitation objects, with a ratio [OIII]/Hβ=2.8+/-0.11 normally found in H II regions located at large galactocentric distances. We suggest that CM 67 represents the tip of a bar which has a length of several Kpc.
Publication Year: 1991
Publication Date: 1991-03-01
Language: en
Type: article
Indexed In: ['crossref']
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Cited By Count: 7
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