Echo mapping of broad H-beta emission in NGC 5548

Details Echo mapping of broad H-beta emission in NGC 5548 Echo mapping of broad H-beta emission in NGC 5548

Jan 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991apj...367l...5h&link_type=abstract

Astrophysical Journal, Part 2 - Letters (ISSN 0004-637X), vol. 367, Jan. 20, 1991, p. L5-L8.

Astronomy and Astrophysics

Astrophysics

85

Active Galactic Nuclei, Emission Spectra, H Beta Line, Seyfert Galaxies, Astronomical Spectroscopy, Computerized Simulation, Line Spectra, Transfer Functions

Scientific paper

A one-dimensional echo map of the broad H-beta emission-line region in the Seyfert 1 galaxy NGC 5548 is reconstructed by using a maximum entropy technique to model the variable optical continuum and integrated H-beta emission-line fluxes observed during the 1989-1990 monitoring campaign as reported by Peterson et al. (1991). The echo map has a strong peak at a time delay of 20 lt-days which has an unresolved full width of 20 days at half-maximum. The H-beta response at time delay zero is less than one-third of that at 20 days, implying a deficit of H-beta-emitting gas near the line of sight to the continuum source. This rules out spherically symmetric and edge-on disk geometries for isotropically emitting H-beta clouds.

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