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Published December 1982 | Published
Journal Article Open

Infrared properties of serendipitous X-ray quasars


Near-infrared measurements have been obtained of 30 quasars originally found serendipitously as x-ray sources in fields of other objects. The observations show that the infrared characteristics of these quasars do not differ significantly from those of quasars selected by other criteria. Because this x-ray-selected sample is subject to different selection biases than previous radio and optical surveys, this conclusion is useful in validating previous inferences regarding the infrared colors of "typical" quasars.

Additional Information

© 1982 American Astronomical Society. Received 26 July 1982; revised 8 September 1982. This work has been supported by NSF Grants No. AST 77-27745 and No. AST 80-17335, NASA Contracts No. NAS 8-30753 and No. NGL 05-002-207, and the Alfred P. Sloan Foundation. We thank R. A. Downes and S. F. Anderson for aid in reducing the data. The data on the sample of quasars found from their ultraviolet excess are from a forthcoming paper with R. Green and M. Schmidt who kindly gave permission to quote results prior to publication.

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Published - 1982AJ_____87_1639N.pdf


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