Echo images of broad-line regions in active Galactic nuclei

Details Echo images of broad-line regions in active Galactic nuclei Echo images of broad-line regions in active Galactic nuclei

Oct 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991apj...379..586w&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 379, Oct. 1, 1991, p. 586-591.

Astronomy and Astrophysics

Astrophysics

60

Active Galactic Nuclei, Emission Spectra, Line Spectra, Transfer Functions, Astronomical Models, Astronomical Spectroscopy, Gas Flow, Light Curve, Spectral Line Width

Scientific paper

Continuum and emission line variations can be used to form two-dimensional images of gas flows in the nuclear regions of active galaxies. The 'echo image' is the two-dimensional transfer function that maps continuum variations to emission-line variations. Convolving a continuum light curve C(t) with the echo image yields L(v, t), the line light curve at each velocity across the line. A procedure for constructing the echo image of a given BLR model is described. Echo images for several BLR models are presented and discussed. A simulated continuum light curve is generated and convolved with the echo images to produce trailed spectrograms showing variations of the line fluxes and line profiles. Because the echo image incorporates both velocity and time-delay information, it is far more powerful probe of the structure of the BLR than one-dimensional velocity profiles, transfer functions, or cross-correlation functions.

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