The Properties of Infrared Color-selected Quasars

May 1989 • 1989ApJ...340L...1L

Authors • Low, F. J. • Cutri, R. M. • Kleinmann, S. G. • Huchra, J. P.

Abstract • A sample of 11 quasars from the IRAS Point Source Catalog is compared to a larger sample of PG quasars detected by IRAS. Two of the IR-selected objects are Mg II BALs. IRAS 13218+0552 has a rich optical spectrum and a ratio of L_ir_/L_opt_ of 90, much higher than the median for the IR or PG samples (6.1 and 2.1, respectively). Fe II emission is prominent in quasars with strong L_ir_ relative to L_opt_. Two of the seven quasars discovered by IRAS have energy distributions indistinguishable from the typical PG quasars while the others are much redder. All PG quasars detected by IRAS and IR-selected quasars have 0.25 <= F_nu_(25)/F_nu_(60) <= 2.0. The optical-IR-spectral energy distributions are complex and frequently show unexplained structure. The two QSOs with the greatest values of L_oir_ are radio-loud, while the remainder are radio-quiet.

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