A Composite HST Spectrum of Quasars

Details A Composite HST Spectrum of Quasars A Composite HST Spectrum of Quasars

1996-08-29

arxiv.org/abs/astro-ph/9608198v1

Astrophys.J. 475 (1997) 469

Astronomy and Astrophysics

Astrophysics

10 figures To appear in the February 1, 1997, issue of the Ap. J

Scientific paper

10.1086/303560

We 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.

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