Halos of Galaxies & Quasars Doron Chelouche (IAS) The Gaseous Halos of Galaxies and Quasars Doron...
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Transcript of Halos of Galaxies & Quasars Doron Chelouche (IAS) The Gaseous Halos of Galaxies and Quasars Doron...
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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
Out
line
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Halos of Galaxies & Quasars Doron Chelouche (IAS)ob
serv
atio
ns
Bahcall & Spitzer (1969): Absorbers are related to galaxies
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Halos of Galaxies & Quasars Doron Chelouche (IAS)
•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
Steidel et al. (1994-1997)
Rmax
Mo & Miralda-Escude (1996)Fukugita & Peebles (2005)
obse
rvat
ions
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Halos of Galaxies & Quasars Doron Chelouche (IAS)
•SDSS: 106 photometric quasars
•Several dozens of close (<100kpc) separation pairs (observed w/APO & HET)
obse
rvat
ions
Covering factor for REW>0.6A absorber
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Rauch et al. (2002)
Halos of Galaxies & Quasars Doron Chelouche (IAS)
thermalcloudsvNREW
a m
odel
bnbN cloudscloudsclouds )(pc100few a~
HIHHI xnN ~
Lanzetta & Bowen 1992
adopted from Rao et al. (2006)
303.0~ cmnH
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a m
odel
Halos of Galaxies & Quasars Doron Chelouche (IAS)
2.0~50
)10~()1~( 13
dzdl
kpcMsunMn
dzAREWdN
halohalo
MsunM
MsunkpcrM
halo
MgII
13
11
10~
10)200(
For an L* (MgII absorbing) galaxy @z~1:
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Halos of Galaxies & Quasars Doron Chelouche (IAS)Q
uasa
rs 45
90
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Halos of Galaxies & Quasars Doron Chelouche (IAS)
Christensen et al. 2006
Qua
sars
Emission line[ID]
Luminosity[erg/s]
Size (50%)[kpc]
HI Lα 1044 75
CIV λ1548 5∙1043 85
OVI λ1035 4∙1043 50
NV λ1238 2∙1043 70
CIII λ977 8∙1042 90
OVIII λ18.97 2∙1042 12
[OIII] λ5007 8∙1041 110
SiIV λ1398 5∙1041 110
HI Hβ 5∙1041 80
NIII λ1991 3∙1041 100
NeX λ12.14 5∙1039 10
HeI λ10830 1039 100
MgII λ2800 3∙1038 120
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Que
stio
nsHalos of Galaxies & Quasars Doron Chelouche (IAS)
•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)
~10L*
~1L*~0.1L*