Astronomy and Astrophysics – Astronomy
Scientific paper
Aug 1987
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987apj...319l..63t&link_type=abstract
Astrophysical Journal, Part 2 - Letters to the Editor (ISSN 0004-637X), vol. 319, Aug. 15, 1987, p. L63-L68.
Astronomy and Astrophysics
Astronomy
42
Color-Magnitude Diagram, Elliptical Galaxies, Infrared Photometry, Star Formation, Stellar Color, Far Infrared Radiation, Infrared Astronomy Satellite, Infrared Spectra, Interstellar Matter, Stellar Luminosity
Scientific paper
Infrared emission from elliptical and S0 galaxies was studied to determine the extent of low-mass star formation in such early-type galaxies. It is found that the infrared colors of about one-third of the sample are consistent with ongoing star formation, although a contribution to the emission from an 'active' nucleus might play an important role in some objects. Apparently star formation has not ceased in some elliptical and S0 galaxies and may be fueled by mass loss from evolved stars or out of the rubble of galaxian mergers. Of four plausible candidate star-forming ellipticals, three show evidence for accretion and/or merger. It is also concluded that IRAS two-color diagrams are often ambiguous in determining whether or not emission arising from star formation dominates far-infrared luminosity.
Bally John
Thronson Harley A. Jr.
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