CO abundances and star formation in the three irregular galaxies NGC 4449, NGC 4214, and NGC 3838

Details CO abundances and star formation in the three irregular galaxies NGC 4449, NGC 4214, and NGC 3838 CO abundances and star formation in the three irregular galaxies NGC 4449, NGC 4214, and NGC 3838

Mar 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985apj...290..602t&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 290, March 15, 1985, p. 602-608.

Astronomy and Astrophysics

Astronomy

38

Abundance, Carbon Monoxide, Galactic Structure, Hydrogen Clouds, Interstellar Gas, Star Formation, Luminosity, Mass Distribution, Molecular Clouds, Nebulae, Radio Astronomy, Star Distribution

Scientific paper

CO emission has been detected in the central 1.3 kpc of the three irregular galaxies NGC 4449, NGC 4214, and NGC 3738, and also in a gain H II complex in NGC 4449 using the 14 m telescope of teh Five College Radio Astronomy Observatory (HPBW = 50 arcsec). The CO distribution in NGC 4449 appears clumped, with stronger emission found in one H II complex than in the central region of the galaxy. Comparing the irregulars with the luminous Scd galaxy IC 342, all of which are roughly at the same distance, the central 50 arcsec of the irregulars have 2-5 times less blue luminosity than the central 50 arcsec in 1C 342 but have factors of 40-70 less CO. A power law relation is observed between the CO and blue fluxes in the irregular galaxies. This is significantly different from the roughly linear relationship found for the central 5kpc in late-type spirals (Young and Scoville, 1982). Thus, irregular galaxies with the same CO intensity as spirals are more optically luminous.

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