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Halos of Galaxies & Quasars Doron Chelouche (IAS). 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!.

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Halos of Galaxies & Quasars Doron Chelouche (IAS)

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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Halos of Galaxies & Quasars Doron Chelouche (IAS)

observations

Bahcall & Spitzer (1969): Absorbers are related to galaxies

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Halos of Galaxies & Quasars Doron Chelouche (IAS)

Rmax

Steidel et al. (1994-1997)

Mo & Miralda-Escude (1996)

Fukugita & Peebles (2005)

  • Galaxies : 0.07-3L*
  • Unit covering factor up to Rmax
  • Rmax ~ Lα (α~0.1―0.4)
  • Metalicity (~0.1 solar)
  • No correlation w/galaxy inclination and or rotation

observations

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Halos of Galaxies & Quasars Doron Chelouche (IAS)

Covering factor for REW>0.6A absorber

  • SDSS: 106 photometric quasars
  • Several dozens of close (<100kpc) separation pairs (observed w/APO & HET)

observations

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Halos of Galaxies & Quasars Doron Chelouche (IAS)

Rauch et al. (2002)

adopted from Rao et al. (2006)

a model

Lanzetta & Bowen 1992

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Halos of Galaxies & Quasars Doron Chelouche (IAS)

For an L* (MgII absorbing) galaxy @z~1:

a model

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Halos of Galaxies & Quasars Doron Chelouche (IAS)

Quasars

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Halos of Galaxies & Quasars Doron Chelouche (IAS)

Christensen et al. 2006

Quasars

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Halos of Galaxies & Quasars Doron Chelouche (IAS)

~10L*

~1L*

~0.1L*

  • 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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