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29 March 2024
 
  » arxiv » astro-ph/9608198

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A Composite HST Spectrum of Quasars
W. Zheng ; G. A. Kriss ; R. C. Telfer ; J. P. Grimes ; A. F. Davidsen ;
Date 29 Aug 1996
Subject astro-ph
AffiliationJohns Hopkins University
AbstractWe construct a composite quasar spectrum from 284 HST FOS spectra of 101 quasars with redshifts z > 0.33. The spectrum covers the wavelengths between 350 and 3000 A in the rest frame. There is a significant steepening of the continuum slope around 1050 A. The continuum between 1050 and 2200 A can be modeled as a power law with alpha = -0.99. For the full sample the power-law index in the extreme ultraviolet (EUV) between 350 and 1050 A is alpha = -1.96. The continuum flux in the wavelengths near the Lyman limit shows a depression of about 10 percent. The break in the power-law index and the slight depression of the continuum near the Lyman limit are features expected in Comptonized accretion-disk spectra.
Source arXiv, astro-ph/9608198
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