Astronomy and Astrophysics – Astronomy
Scientific paper
Nov 1988
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988apj...334..605t&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 334, Nov. 15, 1988, p. 605-612.
Astronomy and Astrophysics
Astronomy
29
Infrared Astronomy, Irregular Galaxies, Magellanic Clouds, Star Formation, Carbon Monoxide, Cosmic Dust, Emission Spectra, Hydrogen, Spectral Energy Distribution, Star Formation Rate
Scientific paper
Near- and far-IR data and mm-wave CO observations are used to study the star-forming properties of the Magellanic irregular galaxy NGC 4214 and its interstellar medium. The galaxy is forming stars at present at about 0.5-1 solar mass/yr in its central few arcmin, if the new stars follow the Salpeter initial mass function from 0.1 to 100 solar masses. This has been maintained for around a Hubble time, although some regions of the galaxy may undergo periods of enhanced and depressed star formation. Based on the mass of dust in emission at 160 microns, a plausible star formation efficiency of about 1.5 percent is estimated, if the H I gas does not take part in forming stars. Molecular masses derived using the H + 1 - 0 line and a conversion to M(H2) appropriate to spiral galaxies produces a mass estimate that is too low by a factor of five to ten.
Greenhouse Matthew
Harper Doyal A.
Hunter Deidre Ann
Telesco Charles M.
Thronson Harley A. Jr.
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