Astronomy and Astrophysics – Astrophysics
Scientific paper
May 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992aipc..254..220e&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
Astrophysics
3
Accretion Disks, Active Galactic Nuclei, Balmer Series, H Alpha Line, Line Shape, Red Shift, Infrared Spectra, Radio Emission, Radio Galaxies, Spectral Bands
Scientific paper
We report the results of a search for double-peaked H-alpha profiles among moderate redshift, radio-loud AGNs and present spectra of some of our targets. The goal was to find more emission lines that resembled the unusual, double-peaked profile of Arp 102B. We have been able to put together a collection of about half a dozen double-peaked H-alpha profiles, which includes objects observed during our search as well as objects whose doublepeaked profiles were already known. Such profiles are very characteristic of rotation and are the widest of any lines in AGNs, implying velocities of about 20,000 km/s. It is thus very likely that we are looking at a small but distinct subclass of AGNs in which the broad Balmer lines originate in an accretion disk. 3C 332 and 3C 93 are of particular interest because their H-alpha profiles can be fitted with a simple model of a relativistic Keplerian disk, much like the profile of Arp 102B.
Eracleous Michael
Halpern Joseph
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