The far-ultraviolet spectra of early-type galaxies

Details The far-ultraviolet spectra of early-type galaxies The far-ultraviolet spectra of early-type galaxies

May 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988apj...328..440b&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 328, May 15, 1988, p. 440-462.

Astronomy and Astrophysics

Astrophysics

368

Active Galaxies, Elliptical Galaxies, Far Ultraviolet Radiation, Galactic Evolution, Star Formation, Ultraviolet Spectra, Andromeda Galaxy, Cool Stars, Energy Distribution, Iue, Late Stars, Morphology

Scientific paper

New and revised ultraviolet energy distributions are presented based on 97 IUE spectra of 31 early-type galaxies and the bulge of M31. Measurements of the line strength index Mg2 and the V magnitude flux within the IUE aperture are included. The average flux between 1250 and 1850 Å is combined with the V magnitude to form an ultraviolet/optical (1550-V) color. Based on optical spectra and morphology, the sample galaxies are divided into three categories: four star-forming galaxies; four active galaxies; and 24 quiescent galaxies. The major finding of this study is a well-defined, nonlinear relationship between (1550-V) color and Mg2 for the 24 quiescent galaxies. The ultraviolet spectra of quiescent galaxies can be modeled as a sum of two components: a normal, cool stellar population of main-sequence and giant branch stars, plus a very blue population having a steeply rising UV flux below 2000 Å. Two sample population models are explored for the blue stellar component of quiescent galaxies: post-asymptotic giant branch stars and young stars from continuing star formation.

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