NASA/IPAC EXTRAGALACTIC DATABASE
Date and Time of the Query: 2019-06-26 T13:05:34 PDT
Help | Comment | NED Home

For refcode 1991ApJ...377..100K:
Retrieve 15 NED objects in this reference.
Please click here for ADS abstract

NED Abstract

Copyright by American Astronomical Society. Reproduced by permission
1991ApJ...377..100K THE FEATURELESS CONTINUA AND HYDROGEN LINES OF SEYFERT 2 GALAXIES A. L. KINNEY Space Telescope Science Institute, 3700 San Martin Drive, Baltimore, MD 21218 R. R. J. ANTONUCCI Department of Physics, University of California, Santa Barbara, CA 93106 M.J.WARD Department of Astrophysics, University of Oxford, Keble Road, Oxford OX1 3RH, UK A. S. WILSON Astronomy Program, University of Maryland, College Park, MD 20742 AND M. WHITTLE Department of Astronomy, University of Virginia, Charlottesville, VA 22903 Received 1990 November 27; accepted 1991 February 14 ABSTRACT We present optical and ultraviolet spectra taken in similar sized large apertures for 15 Seyfert 2 galaxies. Measurements of emission-line strengths of Ly{alpha}, H{alpha}, and H{beta} are used together with measurements of the ultraviolet slopes to estimate the ratio of recombination photons to ionizing photons. The photon ratios indicate that the ionizing continuum is being emitted anisotropically for at least six of the eight objects with UV slope measurements. The median value of the UV slope is {alpha} = - 1.35 (F_{nu}_ is proportional to {nu}^{alpha}^), which is indistinguishable from the UV slope of Seyfert 1 galaxies. This result suggests that in the occultation/reflection picture of Seyfert nuclei, the reflecting particles are free electrons and not dust. We verify previous observations of variability in Mrk 477 and show that this galaxy exhibits characteristics of both Seyfert 1-and Seyfert 2 galaxies. Subject headings: galaxies: nuclei - galaxies: Seyfert spectrophotometry ultraviolet: spectra
Retrieve 15 NED objects in this reference.
Please click here for ADS abstract

Back to NED Home