IR photometry of flat spectrum radio sources

C. D. Impey, P. W.J.L. Brand

Research output: Contribution to journalArticle

7 Scopus citations

Abstract

IR measurements of optically faint, flat spectrum radio sources have implied the possible existence of a new class of quasar, with IR excess more extreme than that of any extragalactic object. In the present preliminary study, 18 Parkes flat spectrum sources have been observed in the IR without regard to optical morphology, and the red sources are found to be just the tail of the normal distribution of quasar colours. The results imply that a considerable fraction of flat spectrum sources from complete samples may have properties similar to the BL Lac objects.

Original languageEnglish (US)
Pages (from-to)814-816
Number of pages3
JournalNature
Volume292
Issue number5826
DOIs
StatePublished - Dec 1 1981
Externally publishedYes

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