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Published 1990 | metadata_only
Book Section - Chapter

Ultraluminous infrared galaxies and the origin of quasars


The Infrared Astronomical Satellite (IRAS) has discovered a class of ultraluminous infrared galaxies (Lᵢᵣ > 10¹² L_⊙) that are bolometrically as luminous, and slightly more numerous than optically selected quasars in the local universe (z ≲ 0.2). Ground-based observations of a complete sample of 10 of these infrared galaxies suggest that they represent the initial dust-enshrouded stages of quasars. A second group of ultraluminous objects selected on the basis of 'warm' infrared colors are found to be preferentially Seyfert galaxies. We suggest that these ultraluminous 'warm' objects represent the transition phase between the infrared selected and optically selected quasars.

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© Springer-Verlag Berlin Heidelberg 1990. This research was supported by grants from the National Science Foundation and the IRAS Extended Mission Program.

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August 19, 2023
August 19, 2023