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A high-redshift IRAS galaxy with huge luminosity-hidden quasar or protogalaxy?

Rowan-Robinson, M. and Broadhurst, T. and Lawrence, A. and McMahon, R. G. and Lonsdale, C. J. and Oliver, S. J. and Taylor, A. N. and Hacking, P. B. and Conrow, T. and Saunders, W. and Ellis, R. S. and Efstathiou, G. P. and Condon, J. J. (1991) A high-redshift IRAS galaxy with huge luminosity-hidden quasar or protogalaxy? Nature, 351 (6329). pp. 719-721. ISSN 0028-0836. doi:10.1038/351719a0.

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DURING a survey intended to measure redshifts for 1,400 galaxies identified with faint sources detected by the Infrared Astronomy Satellite, we found an emission-line galaxy at a redshift of 2.286, and with the enormous far-infrared luminosity of 3 × 10^(14) times that of the Sun (L_☉). The spectrum is very unusual, showing lines of high excitation but with very weak Lyman-α emission. A self-absorbed synchrotron model for the infrared energy distribution cannot be ruled out, but a thermal origin seems more plausible. A radio-quiet quasar embedded in a very dusty galaxy could account for the infrared emission, as might a starburst embedded in 1−10 × 10^9 M_☉ of dust. The latter case demands so much dust that the object would probably be a massive galaxy in the process of formation. In either case, this is a remarkable object, and the presence of a large amount of dust in an object of such high redshift implies the generation of heavy elements at an early cosmological epoch.

Item Type:Article
Related URLs:
URLURL TypeDescription ReadCube access
Lonsdale, C. J.0000-0003-0898-406X
Oliver, S. J.0000-0001-7862-1032
Ellis, R. S.0000-0001-7782-7071
Condon, J. J.0000-0003-4724-1939
Additional Information:© 1991 Nature Publishing Group. Received 12 February; accepted 14 May 1991. We thank P. McCarthy, R. Cutri, P. Eisenhardt, C. Benn and the staff at UKIRT and the WHT for observations of 10214 +4724. T.J.B., AL, R.G.M., S.J.O., A.N.T. and W.S. acknowledge support from SERC. Research at IPAC is carried out under a contract with NASA.
Group:Infrared Processing and Analysis Center (IPAC)
Funding AgencyGrant Number
Science and Engineering Research Council (SERC)UNSPECIFIED
Issue or Number:6329
Record Number:CaltechAUTHORS:20150514-141841339
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:57537
Deposited By: Ruth Sustaita
Deposited On:14 May 2015 21:35
Last Modified:10 Nov 2021 21:51

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