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Title:
The Magellanic irregular galaxy NGC 4214 - Star formation and the interstellar medium
Authors:
Thronson, Harley A., Jr.; Greenhouse, Matthew; Hunter, Deidre A.; Telesco, C. M.; Harper, D. A.
Affiliation:
AA(Wyoming Infrared Observatory, Laramie), AB(Wyoming Infrared Observatory, Laramie), AC(Lowell Observatory, Flagstaff, AZ), AD(NASA, Marshall Space Flight Center, Huntsville, AL), AE(Yerkes Observatory, Williams Bay, WI)
Publication:
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 334, Nov. 15, 1988, p. 605-612. (ApJ Homepage)
Publication Date:
11/1988
Category:
Astrophysics
Origin:
STI
NASA/STI Keywords:
INFRARED ASTRONOMY, IRREGULAR GALAXIES, MAGELLANIC CLOUDS, STAR FORMATION, CARBON MONOXIDE, COSMIC DUST, EMISSION SPECTRA, HYDROGEN, SPECTRAL ENERGY DISTRIBUTION, STAR FORMATION RATE
DOI:
10.1086/166864
Bibliographic Code:
1988ApJ...334..605T

Abstract

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.

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