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29 March 2024 |
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Article overview
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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 | Affiliation: | Johns Hopkins University | Abstract: | 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. | Source: | arXiv, astro-ph/9608198 | Services: | Forum | Review | PDF | Favorites |
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