Is NGC 4631 a barred spiral galaxy?

Details Is NGC 4631 a barred spiral galaxy? Is NGC 4631 a barred spiral galaxy?

Mar 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991aj....101..825r&link_type=abstract

Astronomical Journal (ISSN 0004-6256), vol. 101, March 1991, p. 825-828, 1094, 1095. NSERC-supported research.

Astronomy and Astrophysics

Astronomy

10

Barred Galaxies, H Ii Regions, Molecular Clouds, Forbidden Transitions, Interstellar Matter, Molecular Spectra

Scientific paper

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 easternmost 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 (forbidden O III line/H-beta) = 2.8 + or - 0.11 normally found in H II regions located at large galactocentric distances. It is suggested that CM 67 represents the tip of a bar which has a length of several kpc.

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