Quasar H-beta profiles and discs

Details Quasar H-beta profiles and discs Quasar H-beta profiles and discs

Apr 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991mnras.249..577j&link_type=abstract

Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 249, April 15, 1991, p. 577-583.

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19

Astronomical Spectroscopy, Galactic Structure, H Beta Line, Quasars, Astronomical Models, Radio Emission, Signal To Noise Ratios, Spectral Bands, Variability

Scientific paper

High signal-to-noise spectra of the H-beta region of eight radio-loud quasars are presented in an investigation seeking evidence for the emission of this line from a disk. Although the double-humped profile expected in simple versions of the disk hypothesis is not found, shoulders are found in the profile expected in a modified form of this idea. A model in which the radiation is scattered back from above the disk plane can reproduce the observed spectra, provided that the disk is sufficiently large. The paper discusses whether this model can explain why other H-beta profiles are shoulderless, and whether it is consistent with variability data.

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