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Title:
X-ray spectra of PG quasars. I - The continuum from X-rays to infrared
Authors:
Elvis, Martin; Green, Richard F.; Bechtold, Jill; Schmidt, Maarten; Neugebauer, G.; Soifer, B. T.; Matthews, K.; Fabbiano, G.
Affiliation:
AA(Harvard-Smithsonian Center for Astrophysics, Cambridge, MA), AB(Kitt Peak National Observatory, Tucson, AZ), AC(Steward Observatory, Tucson, AZ), AD(Palomar Observatory, Pasadena, CA), AE(Palomar Observatory, Pasadena, CA)
Publication:
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 310, Nov. 1, 1986, p. 291-316. (ApJ Homepage)
Publication Date:
11/1986
Category:
Astrophysics
Origin:
STI
NASA/STI Keywords:
ASTRONOMICAL SPECTROSCOPY, CONTINUOUS SPECTRA, INFRARED ASTRONOMY, QUASARS, X RAY ASTRONOMY, ASTRONOMICAL CATALOGS, IUE, SPACEBORNE ASTRONOMY, SPECTROPHOTOMETRY, SYNCHROTRON RADIATION
DOI:
10.1086/164683
Bibliographic Code:
1986ApJ...310..291E

Abstract

Einstein IPC X-ray spectra for a sample of eight optically selected quasars from the Palomar Bright Quasar survey are presented. The quasars have a mean power law energy slope which in five individual cases is inconsistent with the value found in hard X-ray selection criterion rather than luminosity, redshift, or U-B color. New IUE and optical continuum spectra and infrared photometry are presented for these quasars. The data are combined into log vf(v) and log v distributions which support the decomposition of the overall quasar spectrum into a power law plus a superposed optical-UV 'big bump' which may be due to an accretion disk. At least six of the quasars have vf(v)s which are roughly constant between their infrared and X-ray power laws, suggesting a strong link between the two regions.

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