Observations of the line profile of Paschen alpha in 3C 273

Details Observations of the line profile of Paschen alpha in 3C 273 Observations of the line profile of Paschen alpha in 3C 273

May 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983pasp...95..289s&link_type=abstract

Astronomical Society of the Pacific, Publications (ISSN 0004-6280), vol. 95, May 1983, p. 289-292. NASA-NSF-supported research.

Astronomy and Astrophysics

Astronomy

4

Astronomical Models, Infrared Spectra, Paschen Series, Quasars, Kinematics, Spectrum Analysis, Velocity Distribution

Scientific paper

Within the uncertainties, the P-alpha line profile is the same as those of H-beta, L-alpha, and C IV. It is therefore contended that if current models of broad-line-emitting clouds in quasars are correct, then the similarity of the P-alpha line profile to the L-alpha profile argues against a velocity field dominated by radial inflow or outflow. It is noted, however, that if the cloud motions are predominantly due to radial inflow or outflow, then the clouds must radiate more isotropically in L-alpha then current models predict. The observed similarity of the line profiles of P-alpha at 1.875 microns and of C IV at 1550 A leads to the conclusion that there is no differential reddening caused by dust between clouds moving at different velocities within the broad line region of 3C 273.

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