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