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Published November 10, 1991 | Published
Journal Article Open

Near-infrared observations of the Z about 2.3 IRAS source FSC 10214 + 4724


Near-infrared imaging and spectroscopy of the extremely luminous IRAS source FSC 10214+4724 have been obtained using the Cassegrain infrared camera on the 200 inch (5.08 m) Hale Telescope. A low-resolution spectrumm (⋋/d⋋ ~ 100) in the 2.0-2.4 μm atmospheric window shows a very strong Hɑ line at the optically determined redshift z = 2.286. The observed rest-frame equivalent width of Hɑ is 0.07 ± 0.02 μm, consistent with the largest values found in quasars. The images show an unresolved source, while the near-infrared colors are somewhat redder than the mean colors of quasars observed at the same redshift. The reddening inferred is A_v ~ 1.5 mag, with an upper limit of ~ 3.0 mag. The observations presented here cannot distinguish between starburst and quasar models for this source. Starburst models require -10^(12) M_☉ of stars to have been formed over 10^7-10^8 yr. If FSC 10214+4724 is a quasar, the reddening-corrected bolometric luminosity is approximately equal to the observed infrared luminosity.

Additional Information

© 1991 American Astronomical Society. Received 1991 July 10; accepted 1991 August 27. We thank Juan Carrasco for assistance with the observations. Infrared astronomy at Caltech is supported by grants from the NSF and NASA. Research at IPAC is carried out under contract with NASA.

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Published - 1991ApJ___381L__55S.pdf


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