Carbon monoxide (CO) in the Magellanic irregular galaxy NGC 55 and the N(H2)/W(CO) ratio in irregular galaxies

Details Carbon monoxide (CO) in the Magellanic irregular galaxy NGC 55 and the N(H2)/W(CO) ratio in irregular galaxies Carbon monoxide (CO) in the Magellanic irregular galaxy NGC 55 and the N(H2)/W(CO) ratio in irregular galaxies

Sep 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989apj...344l..61d&link_type=abstract

Astrophysical Journal, Part 2 - Letters (ISSN 0004-637X), vol. 344, Sept. 15, 1989, p. L61-L64. Research supported by DFG.

Astronomy and Astrophysics

Astrophysics

34

Carbon Monoxide, Irregular Galaxies, Magellanic Clouds, Molecular Clouds, Galactic Mass, H I Regions, Metallicity, Star Formation Rate, Virial Theorem

Scientific paper

Results are presented from a search of NGC 55 and from mapping of NGC 55 in the J = 1-0 CO line. It is shown that the extent of the CO cloud is about 975 pc along the major axis and 390 pc perpendicular to the major axis. It is estimated that the total molecular mass of the cloud is about 8 x 10 to the 7th solar masses. It is found that the factor that transforms the velocity integrated CO line, W(CO), into a column density of molecular H, N(H2), is similar to the value found for the SMC and about 20 times higher than values for the Galaxy. It is concluded that, for irregular galaxies, the dependence of N(H2)/W(CO) on metallicity is inversely proportional to the nitrogen abundance.

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