The Gaseous Halos of Galaxies and Quasars

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The Gaseous Halos of Galaxies and Quasars
Doron Chelouche Institute for Advanced Study,
Princeton
and B. Ménard (CITA), D. Bowen (Princeton), O.
Gnat (Caltech/TAU) and many others!

• Strong MgII Absorbers
• A Proposed Model
• Quasar Halos

Outline
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observations
Bahcall Spitzer (1969) Absorbers are related
to galaxies
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Mo Miralda-Escude (1996) Fukugita Peebles
(2005)

• Galaxies 0.07-3L
• Unit covering factor up to Rmax
• Rmax La (a0.1?0.4)
• Metalicity (0.1 solar)
• No correlation w/galaxy inclination and or
  rotation

observations
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• SDSS 106 photometric quasars
• Several dozens of close (lt100kpc) separation
  pairs (observed w/APO HET)

observations
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adopted from Rao et al. (2006)
a model
Lanzetta Bowen 1992
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For an L (MgII absorbing) galaxy _at_z1
a model
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Quasars
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Christensen et al. 2006
Quasars
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• Do MgII absorbers lie in special environments
  (massive halos? groups?)
• How different are quasar environments from galaxy
  ones
• Unification on large scales
• Implications for galaxy/quasar reionization
  effects?
• Studying absorbers by emission
• (metalicity/mass)

Questions
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