Infrared studies of elliptical galaxies. II. A radio-selected sample

C. D. Impey, C. G. Wynn-Williams, E. E. Becklin

Research output: Contribution to journalArticle

13 Scopus citations

Abstract

We have made an infrared survey of radio galaxies in the Bologna B2 catalog. We find that 40% of our sample have infrared luminosities of at least 109 L⊙, as opposed to about 8% of normal ellipticals. The galaxies are inhomogeneous in their infrared properties; some galaxies have active nuclei, while others appear to be powered by star formation. The most infrared-luminous galaxies in our sample are those listed as "peculiar" by Zwicky. Statistically, these galaxies are strikingly different from Seyfert galaxies in their infrared properties in that they show much more radio emission in comparison with their infrared emission than do Seyferts, even when the emission from the extended radio lobes has been discounted. We also reanalyze the available data on the infrared properties of normal elliptical galaxies and find confirmation that the 10-12 μm emission from these galaxies comes either from circumstellar dust shells around evolved stars or from PAH-like (polycyclic aromatic hydrocarbon) grains.

Original languageEnglish (US)
Pages (from-to)62-74
Number of pages13
JournalAstrophysical Journal
Volume356
Issue number1
DOIs
StatePublished - Jun 10 1990

Keywords

  • Galaxies: photometry
  • Infrared: sources
  • Radio sources: galaxies

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

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