Astronomy and Astrophysics – Astronomy
Scientific paper
May 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992aipc..254..216e&link_type=abstract
In: Testing the AGN paradigm; Proceedings of the 2nd Annual Topical Astrophysics Conference, Univ. of Maryland, College Park, Oc
Astronomy and Astrophysics
Astronomy
3
Accretion Disks, Active Galactic Nuclei, Black Holes (Astronomy), H Alpha Line, Line Shape, Reverberation, Emission Spectra, Radio Galaxies, Seyfert Galaxies, Spectral Line Width
Scientific paper
The paper reports a preliminary search for reverberation from an AGN accretion disk in nightly spectroscopic monitoring of the H-alpha line profiles of eight AGN during January-July 1991. No evidence was found for bumps that drift from the broad wings toward the line centers as predicted by Stella (1990) in any of the objects observed. In NGC 4151 and NGC 5548 the blue shoulder of the broad H-alph profile varies in the time interval between the June and July observations (12 d). These variations take the form of a bump near 6550 A in NGC 4151 and a dip near 6620 A in NGC 5548. The origin of these variations can be radial outflow of material or inhomogenities (hot spots) orbiting in the broad-line region.
Eracleous Michael
Halpern Joseph
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