Astronomy and Astrophysics – Astrophysics
Scientific paper
Dec 1976
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976apj...210..279k&link_type=abstract
Astrophysical Journal, vol. 210, Dec. 1, 1976, pt. 1, p. 279-286.
Astronomy and Astrophysics
Astrophysics
Absorption Spectra, Fine Structure, Interstellar Matter, Line Spectra, Quasars, Red Shift, Clouds, Optical Thickness, Photoionization, Radiative Transfer, Spectral Line Width
Scientific paper
Possible mechanisms are considered for the formation of redshift doublets in absorption spectra of high-redshift quasars. Observational evidence is discussed which indicates that redshift-doublet formation cannot be explained adequately on the basis of two-cloud models. An alternative explanation is proposed whereby an apparent doublet can be produced in a single cloud with a low-density edge. According to this single-cloud model, both components of the line are formed in the same cloud, the line core is split due to a temperature rise at the cloud edge, and the observed line is a superposition of a broad saturated absorption line formed in the body of the cloud and a narrow emission feature formed in the hotter edge. The relative size of the emission core is found to be consistent with physical conditions expected in the clouds responsible for the absorption spectrum. It is shown that the proposed model can explain the facts that splitting occurs only in the strongest lines and that the asymmetry is always in the same direction as well as the small Doppler widths of the split lines and the absence of doublets in the visible spectra of low-redshift quasars.
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