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THE MODERATELY LARGE SCALE STRUCTURE OF QUASARS
Jari Kotilainen (Tuorla Observatory)
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High z quasars: lighthouses of sites of galaxy formation
quasar space density vs BH growth rate vs SFR history=> mergers trigger both SF and quasar activity? => rapid decline of BH activity at low z
Merloni et al. 2005
HIGH Z QUASARS AND GALAXY FORMATION
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BHs in all (?) local massive bulges
Milky Way: M ~3 x 106 Msun
=> all massive galaxies host a remnant BH from a quasar phase?
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Kormendy 2004
tight MBH
– Mbulge – σbulge
correlations (at low z)
nearby quasar hosts: massive bulge-dominated galaxies
masers gas stars
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The most distant quasar (z = 6.4): molecular gas, dust, SF, metals and BH
Barth et al. 2003
How did massive bulges and SMBHs form in < 1 Gyr?
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QUASAR HOSTS AT HIGH REDSHIFT (z > 1)
VLT + ISAAC non-AO imaging => 30 hosts at 1 < z < 2
VLT+NACO AO imaging => two RLQ hosts (z ~2.5 and z ~2.9) two RQQ hosts (z ~2.1 and z ~2.5)
Kotilainen et al. 2007 ApJ 660, 1039
Falomo et al. 2007 ApJ, in press
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Evolution of quasar host luminosity
RLQ hosts ~10 x more luminous (massive)
BH mass? mass accretion rate?
BH mass threshold for radio activity?
c.f. clustering properties, SEDs
passive evolution into local massive spheroids
no decrease in luminosity ? => early epoch for the latest merger
decrease in luminosity ?=> tight quasar - host co-evolution
different for RLQs and RQQs ?
RLQ
RQQ
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… where BHs are fuelled and galaxies grow by mergers
=> predict decrease in host luminosity
=> NOT observed up to z = 2
c.f. hierarchical structure formation…
more recent models: AGN/SN feedback
Granato et al. 2004, Bower et al. 2006
Di Matteo et al. 2005
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WORK IN PROGRESS...
evolution of MBH
– Mbulge
relation with z?
spectra of resolved quasars at 1 < z < 3
images => Mbulge spectra => virial MBH
z = 1.8z = 2.5
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CDM => massive density peaks in early Universe are strongly clustered: cores of rich clusters => clustering of high z quasars
for radio galaxies: threshold DM halo (BH) mass required to produce significant radio emission...
Magliocchetti et al. 2005
MORE WORK IN PROGRESS...
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Falomo et al. 2005
...but no radio luminosity dependence of clustering/DM content/BH mass
Magliocchetti et al. 2005
also: lensing, close companions...