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Event: Quasar Winds: the 4th Element
Event Date/Time: September 23, 2004 4:00 pm
Location:Steward Observatory N210
Speaker:Martin Elvis
Institution:Harvard-Smithsonian Center for Astrophysics
Subject(s): Steward/NOAO Colloquium 
Contact:Tod Lauer    email: tlauer@noao.edu  
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Event Description

Posted:
September 14, 2004 12:40 pm

In the 42 years since quasars were discovered, the paradigm of a supermassive black hole surrounded by an accretion disk and emitting a relativistic jet has become well supported and accepted. However, this paradigm deals with a naked quasar. But the bulk of the >10(4) papers written about quasars make no connection with this paradigm, and deal with the gas surrounding the quasar: the broad and narrow emission lines, and various UV and X-ray absorbing material.

Recently it has become clear that the missing element is the quasar wind. Several components of the surrounding veil of gas are clearly part of a fast wind (1000-10,000 km/s) leaving the inner regions of the quasar. In 2000 I proposed a model in which ALL the atomic features are linked in a single wind structure, so that they constitute the `quasar atmosphere'. I will review how this model has fared since then (well!), and what the implications of this structure for quasar winds and atmospheres affects the study of quasars.

Refreshments will be served at 3:30pm in the Steward Observatory Lobby.



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