Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 1985
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985apj...299..443w&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 299, Dec. 1, 1985, p. 443-461.
Astronomy and Astrophysics
Astronomy
67
Cosmic Dust, Galactic Nuclei, Infrared Astronomy, Luminosity, Seyfert Galaxies, Calibrating, Flux Density, Near Infrared Radiation, Photoionization
Scientific paper
Energy distributions from 1 to 20 microns are presented for a sample of galaxy nuclei all meeting the spectroscopic definition for LINERs (low-ionization nuclear emission-line regions). Shortward of 5 microns most of the nuclei show only stellar emission with normal colors, but at 10 and 20 microns, most nuclei show dust emission. The dust luminosities are correlated with the H-alpha luminosities and are consistent with the hypothesis that the same ultraviolet source ionizes the emission-line gas and heats the dust. The dust almost certainly does not compete strongly for ionizing photons. The ionizing source cannot have a spectrum consisting of a single power law extending from infrared to soft X-ray wavelengths. The observations thus strongly favor photoionization models in which the ionizing source is intrinsically weaker than in Seyfert nuclei.
Elvis Martin
Fabbiano Giuseppina
Lawrence Andy
Ward Martin J.
Willner Steve P.
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