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Date and Time of the Query: 2019-05-22 T17:02:25 PDT
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For refcode 1993ApJS...86....5K:
Retrieve 143 NED objects in this reference.
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NED Abstract

Copyright by American Astronomical Society. Reproduced by permission
1993ApJS...86....5K AN ATLAS OF ULTRAVIOLET SPECTRA OF STAR-FORMING GALAXIES A. L. KINNEY, R. C. BOHLIN, AND D. CALZETTI Space Telescope Science Institute, 3700 San Martin Drive, Baltimore, MD 21218 N. PANAGIA Space Telescope Science Institute, 3700 San Martin Drive, Baltimore, MD 21218; and Istituto di Astronomia, Universita di Catania AND ROSEMARY F. G. WYSE Physics and Astronomy Department, Johns Hopkins University, Homewood Campus, Baltimore, MD 21218 Received 1992 April 13; accepted 1992 September 21 ABSTRACT An atlas of ultraviolet spectra of the central regions of 143 spiral, irregular, blue compact, Seyfert 2, and starburst galaxies is produced by combining 387 low-resolution spectra from the IUE data archives. The spectra have been extracted with an optimal algorithm and co-added to produce spectra with the best possible signal-to-noise ratio. Our data support the picture proposed earlier on the basis of UV spectra from the Orbiting Astronomical Observatory and from the Astronomical Netherlands Satellite that spiral galaxies of later Hubble class have higher flux at the shortest UV wavelengths than do spiral galaxies of earlier Hubble class. A comparison of the UV spectra of low- ionization nuclear emission-line region (LINER) galaxies with the spectra of normal spiral galaxies shows that the UV continuum of LINERs is dominated by the galaxy continuum. In contrast, Seyfert 2 galaxies show a featureless blue continuum plus emission lines, with the UV spectrum of the host galaxy apparent only at the longest UV wavelengths. The starbursting, blue compact, and blue compact dwarf galaxies have UV continua that are flat or increasing toward short wavelengths, with a wide range in spectral index, going from F_{lambda}_ is proportional to {lambda}^0.26+/-0.14^ to F_{lambda} is proportional to {lambda}^-1.85+/- 0.06^. The spectral signature of dust with a wavelength dependence of the extinction such as is seen in the Milky Way is not apparent in these galaxies. The lack of an apparent dust feature (e.g., the 2200 A bump) implies either that the extinction law is different or that any dust present in the galaxies is in the form of clumps and does not contribute to the flux, owing to the very high optical depth. Subject headings: atlases - galaxies: ISM - galaxies: Seyfert - galaxies: spiral - galaxies: starburst - ultraviolet: galaxies
Retrieve 143 NED objects in this reference.
Please click here for ADS abstract

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