Astronomy and Astrophysics – Astrophysics
Scientific paper
Apr 1987
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987apj...315...74w&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 315, April 1, 1987, p. 74-91.
Astronomy and Astrophysics
Astrophysics
174
Continuous Radiation, Cosmic Dust, Galactic Nuclei, Galactic Radiation, Seyfert Galaxies, Active Galactic Nuclei, Active Galaxies, Astronomical Models, Astronomical Spectroscopy, Galactic Evolution, Luminosity, Spectrum Analysis
Scientific paper
Broad-band measurements from 1 to 20 microns of 26 emission-line active galactic nuclei (AGNs), mainly Seyfert 1 galaxies, have been made. These data have been combined with previous optical and infrared photometry and IRAS 12, 25, 60 and 100 micron fluxes, giving a total sample of 37 AGNs, all of which have hard X-ray measurements. The sample includes all the emission-line AGNs identified in the Piccinotti et al. (1982) survey. When corrected for stellar contributions in the near-infrared, the continuum energy distributions can be classified observationally into three types: (1) bare, minimally reddened AGNs; (2) reddened AGNs; and (3) AGNs for which the far-infrared emission is contaminated by the host galaxy. These classifications reflect a range of luminosities and different environments rather than intrinsic differences in the primary continuum of the AGNs. The data are consistent with a single underlying form of active galaxy continuum modified by the presence of dust and of the host galaxy.
Carleton Nathaniel P.
Elvis Martin
Fabbiano Giuseppina
Lawrence Andy
Ward Martin
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