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• W3103511866 endingPage "75" @default.
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• W3103511866 abstract "The ionizing fluxes from quasars and other active galactic nuclei (AGN) are critical for interpreting their emission-line spectra and for photoionizing and heating the intergalactic medium (IGM). Using far-ultraviolet spectra from the Cosmic Origins Spectrograph (COS) on the Hubble Space Telescope (HST), we directly measure the rest-frame ionizing continua and emission lines for 159 AGN at redshifts 0.001 < z_AGN < 1.476 and construct a composite spectrum from 475-1875A. We identify the underlying AGN continuum and strong EUV emission lines from ions of oxygen, neon, and nitrogen after masking out absorption lines from the HI Lya forest, 7 Lyman-limit systems (N_HI > 10^17.2 cm^-2) and 214 partial Lyman-limit systems (15.0 < log N_HI < 17.2). The 159 AGN exhibit a wide range of FUV/EUV spectral shapes, F_nu propto nu^(alpha_nu), typically with -2 < alpha_nu < 0 and no discernible continuum edges at 912A (H I) or 504A (He I). The composite rest-frame continuum shows a gradual break at 1000 A, with mean spectral index alpha_nu = -0.83 +/- 0.09 in the FUV (1200-2000A) steepening to alpha_nu = -1.41 +/- 0.15 in the EUV (500-1000A). We discuss the implications of the UV flux turnovers and lack of continuum edges for the structure of accretion disks, AGN mass inflow rates, and luminosities relative to Eddington values." @default.
• W3103511866 created "2020-11-23" @default.
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• W3103511866 date "2014-09-24" @default.
• W3103511866 modified "2023-10-14" @default.
• W3103511866 title "<i>HST</i>-COS OBSERVATIONS OF AGNs. II. EXTENDED SURVEY OF ULTRAVIOLET COMPOSITE SPECTRA FROM 159 ACTIVE GALACTIC NUCLEI" @default.
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• W3103511866 doi "https://doi.org/10.1088/0004-637x/794/1/75" @default.
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