Carbon emission line profiles of high redshift quasars

Astronomy and Astrophysics – Astrophysics

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Carbon, Emission Spectra, Line Shape, Line Spectra, Quasars, Red Shift, Astronomical Models, Astronomical Spectroscopy, Forbidden Bands, Spectral Energy Distribution, Spectral Line Width, Spectrum Analysis, Vidicons

Scientific paper

Emission line profiles of C IV 1550 lines in 22 quasars are obtained from spectroscopy with a cooled SIT Vidicon. In 10 of the objects the semiforbidden C III lines are found to have similar profiles. The observed line profiles are well approximated by the Blumenthal Mathews logarithmic model. The distribution of line breadths (FWHM) - augmented by those in the literature - is inconsistent with a randomly oriented collection of disks, all spinning at the same rate. The Baldwin C IV luminosity effect is not seen in these data. The similarity of line profiles of species of differing ionization potentials suggests that the lines are formed in a number of clouds of different velocities; the smoothness of the lines requires (assuming a nonuniform Poisson velocity distribution) at least 300 clouds. The line profiles and distribution of line breadths suggest that the cloud formation is three-dimensional rather than planar.

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