A relation between UV excess and the interstellar medium in elliptical galaxies?

Details A relation between UV excess and the interstellar medium in elliptical galaxies? A relation between UV excess and the interstellar medium in elliptical galaxies?

May 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988mnras.232..215s&link_type=abstract

Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 232, May 1, 1988, p. 215-224. SERC-supported research.

Astronomy and Astrophysics

Astronomy

6

Cosmic Dust, Elliptical Galaxies, Interstellar Extinction, Interstellar Matter, Ultraviolet Spectra, Galactic Nuclei, Infrared Signatures, Iue, Luminous Intensity, Optical Emission Spectroscopy, Spectrum Analysis, Star Formation Rate

Scientific paper

IUE spectra of the nuclear region of the dust-lane elliptical galaxy NGC 7196 have been obtained with the intention of investigating a possible relationship between UV excess and the presence of a cool interstellar medium component in elliptical galaxies. This galaxy has a smooth, compact major-axis dust lane and no known nuclear activity. Excess UV emission comparable to that in M87 is present at wavelengths shortward of about 2000 A, although the spectrum at longer wavelengths is redder than that of the 'standard' elliptical galaxy NGC 3379. The observations combined with IRAS data are used to investigate the present day star formation rate, and a model is discussed in which the long wavelength reddening is caused by a diffuse dusty medium rich in small grains. It is pointed out that heating of the dust lane by a hot, low-density atmosphere (common in elliptical galaxies) could provide a significant contribution to the infrared flux.

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