Constraints on Quasar Continuum, BELR, and BALR Physics from SDSS Composite Spectra

Details Constraints on Quasar Continuum, BELR, and BALR Physics from SDSS Composite Spectra Constraints on Quasar Continuum, BELR, and BALR Physics from SDSS Composite Spectra

2003-12-04

arxiv.org/abs/astro-ph/0312137v1

Astronomy and Astrophysics

Astrophysics

6 pages, 5 figures; To appear in "AGN Physics with the Sloan Digital Sky Survey," eds. G.T. Richards and P.B. Hall

Scientific paper

We review recent results on quasars from the SDSS as they relate to our understanding of the UV/optical continuum, the broad emission line region, and the broad absorption line region. The ensemble average colors of large numbers of quasars promise to provide constraints on the optical/UV continuum emission mechanism. High-ionization emission-line blueshifts and emission line properties as a function of optical/UV spectral index trace the structure of the broad emission line region. Statistical analysis of the broad absorption line quasar population suggests that they are more ubiquitous than one might otherwise think and are not likely to represent a completely distinct population of quasars, but that the BAL trough properties are a function of the underlying optical continuum and emission properties of the quasar.

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