CIV Emission And The Ultraviolet Through X-ray Spectral Energy Distribution Of Radio-quiet Quasars

Details CIV Emission And The Ultraviolet Through X-ray Spectral Energy Distribution Of Radio-quiet Quasars CIV Emission And The Ultraviolet Through X-ray Spectral Energy Distribution Of Radio-quiet Quasars

May 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011aas...21832713r&link_type=abstract

American Astronomical Society, AAS Meeting #218, #327.13; Bulletin of the American Astronomical Society, Vol. 43, 2011

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At high redshift two parameters span the range of emission line properties in quasar broad emission line regions: the CIV equivalent width and the blueshift of the CIV line relative to the quasar rest frame. We explore the connection between these emission line features and the UV through X-ray spectral energy distribution (SED) for radio-quiet quasars. We find that radio-quiet quasars with both strong CIV emission and small CIV blueshifts can be classified as ``hard-spectrum'' sources that are (relatively) strong the in X-ray as compared to the UV. The low-energy X-ray upturn (``soft excess'') in some quasars may be consistent with the high-energy extension of the ``big blue bump'' in hard-spectrum sources. On the other hand, RQ quasars with both weak CIV emission and large CIV blueshifts are instead ``soft-spectrum'' sources. The nature of sources with weak CIV and small blueshifts is less clear and needs further study. We argue that bolometric corrections for quasars may have systematic errors if a single mean SED is assumed for all objects, leading to additional systematic errors in accretion rates as determined by L_bol/M_vir. Bolometric corrections can instead be considered as a function of the ionizing spectrum, which can be inferred from the properties of the broad emission lines, particularly CIV.

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