Infrared observations of LINER galactic nuclei

S. P. Willner, M. Elvis, G. Fabbiano, A. Lawrence, M. J. Ward

Research output: Contribution to journalArticlepeer-review

Abstract

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.
Original languageEnglish
Pages (from-to)443-461
JournalAstrophysical Journal
Volume299
DOIs
Publication statusPublished - 1 Dec 1985

Keywords

  • Cosmic Dust
  • Galactic Nuclei
  • Infrared Astronomy
  • Luminosity
  • Seyfert Galaxies
  • Calibrating
  • Flux Density
  • Near Infrared Radiation
  • Photoionization

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