Far-ultraviolet Color Gradients in Early-Type Galaxies

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Published 1998 August 24 • © 1998. The American Astronomical Society. All rights reserved. Printed in U.S.A.
, , Citation R. G. Ohl et al 1998 ApJ 505 L11 DOI 10.1086/311605

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Author affiliations

1 Astronomy Department, University of Virginia, P.O. Box 3818, Charlottesville, VA 22903

2 Space Telescope Science Institute, 3700 San Martin Drive, Baltimore, MD 21218

3 Laboratory for Astronomy and Solar Physics, Code 681, NASA/Goddard Space Flight Center, Greenbelt, MD 20771

4 National Radio Astronomy Observatory, 520 Edgemont Road, Charlottesville, VA 22903

5 Also at Department of Physics and Astronomy, Johns Hopkins University, Charles and 34th Streets, Baltimore, MD 21218

6 Raytheon STX Corp., Lanham, MD 20706

7 Also at Astronomy Department, University of Virginia, P.O. Box 3818, Charlottesville, VA 22903

Dates

  1. Received 1998 June 25
  2. Accepted 1998 July 17
  3. Published
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1538-4357/505/1/L11

Abstract

We discuss far-UV (FUV) (1500 Å) surface photometry and FUV-B color profiles for eight E/S0 galaxies from images taken with the Ultraviolet Imaging Telescope, primarily during the Astro-2 mission. In three cases, the FUV radial profiles are more consistent with an exponential than a de Vaucouleurs function, but there is no other evidence for the presence of a disk or of young, massive stars. In all cases except M32, the FUV-B color becomes redder at larger radii. There is a wide range of internal radial FUV-B color gradients. However, we find no correlation between the FUV-B color gradients and internal metallicity gradients based on Mg absorption features. We conclude that metallicity is not the sole parameter controlling the "UV upturn component" in old populations.

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10.1086/311605