Other
Scientific paper
Dec 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007aas...211.7504r&link_type=abstract
American Astronomical Society, AAS Meeting #211, #75.04; Bulletin of the American Astronomical Society, Vol. 39, p.865
Other
Scientific paper
Active Galactic Nuclei are believed to be powered by accretion onto a Super-Massive Black Hole. In order to have material falling into the SMBH, angular momentum conservation requires a counterpart for this accretion that is fueling the SMBH in the AGN. Outflows might play an essential role in active galactic nuclei. They show common occurance, both in quasars (30%-40% in optically selected quasars) and Seyfert galaxies (approx. 60%), but might be obiquitous if they subtend a small angular fraction in the sky. Moreover, they bring information from the AGN inner regions that is not accesible in other ways. Although for more than a decade models have included material outflowing from an accretion disk around a SMBH, surprisingly there is no consensus in our understanding of basic properties like the acceleration mechanism(s), launch radii, mass loss rates, terminal velocities, etc. We are involved in a program to derive basic dynamical characteristics for some well-studied individual flows, and, in particular, we are interested in High Velocity (HV) outflows since they will present unique challenges for the above mentioned theoretical models. In order to do so, we have developed the first systematic accounting of CIV outflow lines, taking advantage of Sloan Digital Sky Survey data (SDSS) DR4. We will present the results of our study of a nearly unexplored part of AGN parameter space: HV winds with v>10,000 km/s but small velocity dispersions (narrow absorption lines). We combine these results with XMM observations to study the relation between optical and X-ray HV outflows. Finally, we input our constraints into currently developed models to help them predict the observed conditions.
Chartas George
Eracleous Michael
Hamann Fred
Nestor Daniel
Prochaska Jason
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