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Title:
Infrared emission and mass loss from evolved stars in elliptical galaxies
Authors:
Knapp, G. R.; Gunn, J. E.; Wynn-Williams, C. G.
Affiliation:
AA(Princeton Univ. Observatory, NJ), AB(Princeton Univ. Observatory, NJ), AC(Hawaii Univ., Honolulu)
Publication:
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 399, no. 1, p. 76-93. (ApJ Homepage)
Publication Date:
11/1992
Category:
Astrophysics
Origin:
STI
NASA/STI Keywords:
Elliptical Galaxies, Infrared Astronomy, Stellar Evolution, Thermal Emission, Active Galactic Nuclei, Emission Spectra, Interstellar Matter, Red Giant Stars
DOI:
10.1086/171904
Bibliographic Code:
1992ApJ...399...76K

Abstract

Small aperture 10.2-micron measurements of normal elliptical galaxies show that for almost all of these galaxies the 12-micron emission seen by IRAS is extended on the scale of the galaxy. NGC 1052 and NGC 3998 are exceptions to this; much of their 10-12-micron emission comes from the inner regions of the galaxies and may be associated with their active nuclei, as is the case for many radio galaxies. The distribution of the IR light and the IR colors of elliptical galaxies suggest that the most plausible source of the 12-micron emission is photospheric and circumstellear emission from cool evolved red giant stars. The 12-micron emission is well in excess of that expected from photospheric emission alone; about 40 percent of it probably comes from circumstellar dust.

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