Astronomy and Astrophysics – Astrophysics
Scientific paper
May 1999
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999aas...194.2006v&link_type=abstract
American Astronomical Society, 194th AAS Meeting, #20.06; Bulletin of the American Astronomical Society, Vol. 31, p.857
Astronomy and Astrophysics
Astrophysics
Scientific paper
Analyses of the C iv lambda 1549 line profile of high redshift (z=1.5 - 3.5) quasars show the full line base width to increase with decreasing radio core-dominance. This implies that the high-velocity gas emitting C iv, and possibly the high-ionization lines in general, is situated close to the accretion disk and has similar dynamics. The results of the analyses also argue against the high-ionization lines originating in e.g. a polar outflow or a spherical distribution of broad-line clouds, but support models such as the Disk-Wind model (Murray & Chiang 1995, 1997). A model is proposed to explain these and previously reported characteristics of radio-loud and radio-quiet quasars, respectively. It is based in part on a slightly modified version of the Disk-Wind scenario, adopted to account for the common properties of the broad-line region in all quasars, in which the broad lines are emitted from the base of winds evaporated off the accretion disk. Radio-loud quasars are, compared to radio-quiet sources, suggested in the model to (1) contain less dust and to (2) have stronger magnetic fields and a faster spinning central black hole. A qualitative scenario is suggested, based on the latter two key properties, to account for the generation and collimation of the relativistic radio-jets observed in radio-loud quasars, and for the lack of such powerful radio emission in radio-quiet ones. Some theoretical and observational tests of the model are presented. Murray, N., & Chiang, J 1995, Astrophysical Journal Letters, 454, L105 Murray, N., & Chiang, J 1997, Astrophysical Journal, 474, 91
No associations
LandOfFree
A Model of Radio-loud and Radio-quiet Quasars does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with A Model of Radio-loud and Radio-quiet Quasars, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and A Model of Radio-loud and Radio-quiet Quasars will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-1120045