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Ultraluminous infrared galaxies and the origin of quasars

Sanders, D. B. and Soifer, B. T. and Elias, J. H. and Madore, B. F. and Matthews, K. and Neugebauer, G. and Scoville, N. Z. (1988) Ultraluminous infrared galaxies and the origin of quasars. Astrophysical Journal, 325 (1). pp. 74-91. ISSN 0004-637X. http://resolver.caltech.edu/CaltechAUTHORS:20170301-103148522

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Abstract

An evolutionary connection between ultraluminous infrared galaxies and quasars is deduced from the observations of all 10 infrared galaxies with luminosities L(8-1000 μm) ≥ 10^(12) L⊙, taken from a flux-limited sample of infrared bright galaxies. Images of the infrared galaxies show that nearly all are strongly interacting merger systems with exceptionally luminous nuclei. Millimeter-wave CO observations show that these objects typically contain 0.5-2 x 10^(10) M⊙ of H_2. Optical spectra indicate a mixture of starburst and active galactic nucleus (AGN) energy sources, both of which are apparently fueled by the tremendous reservoir of molecular gas. It is proposed that these ultraluminous infrared galaxies represent the initial, dust-enshrouded stages of quasars. Once these nuclei shed their obscuring dust, allowing the AGN to visually dominate the decaying starburst, they become optically selected quasars. The origin of quasars through the merger of molecular gas-rich spiral galaxies can account for both the increased number of high-luminosity quasars at large redshift, when the universe was smaller and gas supplies less depleted, and the observed "redshift-cutoff" of quasars which represents the epoch after galaxy formation when the first collisions occur.


Item Type:Article
Related URLs:
URLURL TypeDescription
http://dx.doi.org/10.1086/165983DOIArticle
http://adsabs.harvard.edu/doi/10.1086/165983ADSArticle
ORCID:
AuthorORCID
Madore, B. F.0000-0002-1576-1676
Scoville, N. Z.0000-0002-0438-3323
Additional Information:© 1998 American Astronomical Society. Received 1987 May 7; accepted 1987 July 1. We thank G. E. Danielson, Carol J. Lonsdale, and S. E. Persson for help in reducing the data, and M. Schmidt and J. Pringle for useful discussions. We also thank J. Carasco, S. Staples, and J. Wright for assistance at the Palomar 5 m and 1.5 m telescopes. Ground-based infrared astronomy at Caltech is supported by a grant from the NSF. J. H. E., G. X. N., D. B. S., and B. T. S. were also supported by NASA through the IRAS extended mission program. B. F. M. was supported by a Killam Fellowship from the Canada Council and a grant from the Natural Sciences and Engineering Research Council of Canada. N. Z. S. was supported by NSF grant AST84-12473. The Palomar 1.5 m telescope is operated jointly by the California Institute of Technology and the Carnegie Institution of Washington.
Group:COSMOS
Funders:
Funding AgencyGrant Number
NASAUNSPECIFIED
Canada CouncilUNSPECIFIED
Natural Sciences and Engineering Research Council of Canada (NSERC)UNSPECIFIED
NSFAST84-12473
Subject Keywords:galaxies: evolution - galaxies: photometry - infrared: sources - quasars
Record Number:CaltechAUTHORS:20170301-103148522
Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:20170301-103148522
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:74642
Collection:CaltechAUTHORS
Deposited By: Tony Diaz
Deposited On:01 Mar 2017 19:15
Last Modified:22 May 2017 17:26

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