New results on quasar outflows

Fred Hamann, Nissem Kanekar, Jason X. Prochaska, Michael T. Murphy, Nikola Milutinovic, Sara Ellison, Wim Ubachs, Gary Ferland

Research output: Contribution to journalArticlepeer-review


Accretion disk outflows are an important part of the quasar phenomenon. They might play a major role in distributing metals to the galactic surroundings, halting growth of the central black hole and providing kinetic energy "feedback" to regulate star formation in the host galaxies. Some models of galaxy evolution indicate that feedback requires kinetic energy luminosities, LK, that are ∼5% of the quasar bolometric; L K/L = Mwv2/2ηMaccc ∼ 5% is possible if Mw ∼ Macc (with v ∼ 0.1c, and η ∼ 0.1). Here we describe results from two studies designed to test the theoretical energetics of radiatively driven outflows and derive observational constraints on the outflow geometry and physical properties emphasizing weaker outflow features like NALs and mini-BALs.

Original languageEnglish
Pages (from-to)399
Number of pages1
JournalProceedings of the International Astronomical Union
Issue numberS267
StatePublished - Aug 2009


  • Galaxies: evolution
  • Line: formation
  • Quasars: absorption lines
  • Quasars: general

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science


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