Astronomy and Astrophysics – Astronomy
Scientific paper
Mar 1988
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988apj...326l..45a&link_type=abstract
Astrophysical Journal, Part 2 - Letters to the Editor (ISSN 0004-637X), vol. 326, March 15, 1988, p. L45-L49. Research supported
Astronomy and Astrophysics
Astronomy
62
Astronomical Spectroscopy, Infrared Sources (Astronomy), Starburst Galaxies, Wolf-Rayet Stars, Astronomical Models, Galactic Evolution, Galactic Nuclei, Infrared Spectra, Stellar Mass, Visible Spectrum
Scientific paper
Spectra covering the wavelength range 4476-7610 A are presented for the powerful far-infrared galaxy IRAS 01003-2238. The broad emission band centered at a rest wavelength of roughly 4660 A, and other broad weaker features are interpreted, as arising from the combined effect of approximately 100,000 late Wolf-Rayet stars of the WN subtype. This represents perhaps the most direct evidence to date for the presence of a large number of hot massive stars in the nucleus of a very powerful far-infrared galaxy. The high number of Wolf-Rayet stars in relation to the number of O-type stars may be interpreted as arguing against continuous steady state star formation in 01003-2238, in favor of a recent burst of star formation occurring approximately 100 million yrs ago.
Armus Lee
Heckman Timothy M.
Miley George K.
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