2011AJ....142..130K -
Astron. J., 142, 130 (2011/October-0)
C IV emission and the ultraviolet through X-ray spectral energy distribution of radio-quiet quasars.
KRUCZEK N.E., RICHARDS G.T., GALLAGHER S.C., DEO R.P., HALL P.B., HEWETT P.C., LEIGHLY K.M., KRAWCZYK C.M. and PROGA D.
Abstract (from CDS):
In the rest-frame ultraviolet (UV), two of the parameters that best characterize the range of emission-line properties in quasar broad emission-line regions are the equivalent width and the blueshift of the C IV λ1549 line relative to the quasar rest frame. We explore the connection between these emission-line properties and the UV through X-ray spectral energy distribution (SED) for radio-quiet (RQ) quasars. Our sample consists of a heterogeneous compilation of 406 quasars from the Sloan Digital Sky Survey (at z > 1.54) and Palomar-Green survey (at z < 0.4) that have well-measured C IV emission-line and X-ray properties (including 164 objects with measured Γ). We find that RQ quasars with both strong C IV emission and small C IV blueshifts can be classified as "hard-spectrum" sources that are (relatively) strong in the X-ray as compared to the UV. On the other hand, RQ quasars with both weak C IV emission and large C IV blueshifts are instead "soft-spectrum" sources that are (relatively) weak in the X-ray as compared to the UV. This work helps to further bridge optical/soft X-ray "eigenvector 1" relationships to the UV and hard X-ray. Based on these findings, we argue that future work should consider systematic errors in bolometric corrections (and thus accretion rates) that are derived from a single mean SED. Detailed analysis of the C IV emission line may allow for SED-dependent corrections to these quantities.
Abstract Copyright:
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Journal keyword(s):
accretion, accretion disks - line: profiles - quasars: emission lines - quasars: general - ultraviolet: galaxies - X-rays: galaxies
Simbad objects:
13
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