QSO host galaxy properties from GEMS and COSMOS from z=0 to 3 Knud Jahnke Max Planck Institute for Astronomy, Heidelberg Sebastián F. Sánchez (CAHA) Lutz Wisotzki (AIP) +the GEMS team Eva Schinnerer (MPIA) Vernesa Smolcic (MPIA) Chris Impey (U Arizona) Jared Gabor (U Arizona) +the COSMOS team(s)

Goals: state & evolution of QSO host galaxies role in general galaxy formationrole in general galaxy formation GEMS: 80 broad line QSOs z<3) optically selected (COMBO17)optically selected (COMBO17) photo-z‘s (COMBO17)photo-z‘s (COMBO17) ACS imaging F606W (=V), F850LP (=z)ACS imaging F606W (=V), F850LP (=z) COSMOS: 120 broad line QSOs (25 March 06) optically selected (SDSS & SDSS+MMT)optically selected (SDSS & SDSS+MMT) radio selected (VLA-COSMOS)radio selected (VLA-COSMOS) spectro-z‘s (IMACS, zCOSMOS, SDSS)spectro-z‘s (IMACS, zCOSMOS, SDSS) ACS imaging F814W (=i)ACS imaging F814W (=i)

S Broad-line AGN sample: redshift distribution (z<3) 55 QSOs COSMOS 120 QSOs GEMS

S Broad-line AGN sample: redshift distribution (z<3) 55 QSOs COSMOS 120 QSOs GEMS

Broad line QSO host galaxy = (QSO – nucleus)  2d modelling (e.g. with GALFIT) or  PSF subtraction  requires high S/N PSF  problem: TinyTim PSF does not cover PSF details (but can be used for diagnostics)

2“ F606W (GEMS) F850LP (GEMS) F814W (COSMOS) 500 stars 4500 stars 500 stars

ACS: x y Local PSF minus mean PSF

ACS: x y

GEMS PSF star locations COSMOS

10% of objects „Resolved“ point sources: stars minus PSF Normalized subtraction residual Frequency >4% of residual flux

10% of objects „Resolved“ point sources: stars minus PSF Normalized subtraction residual Frequency >4% of residual flux

0.3–0.70.9–1.01.0– –1.31.3–1.51.5–1.61.6–1.81.8–1.91.9–2.12.1–2.9 z = COSMOS ACS F814W 4“

z=2.24 z=2.16 z=1.53 z=0.65

Resolved QSOs: QSO minus PSF Frequency Normalized subtraction residual >4% of residual flux

0.3–0.70.9–1.01.0– –1.31.3–1.51.5–1.61.6–1.81.8–1.91.9–2.12.1–2.9 z =

COSMOS: ~50 resolved type 1 QSO hosts GEMS: ~45 resolved (with optical colour) Sanchez et al. 2004Sanchez et al Jahnke et al. 2004Jahnke et al Jahnke et al. (in prep)Jahnke et al. (in prep) Others: Kukula/Dunlop et al., Hutchings et al., Falomo et al., Kuhlbrodt et al. (at high z, 1–10 objects each) Current status & knowledge

disk dominated bulge dominated undecided GEMS & ground based colours B&C03 (solar)

GEMS z=0.7 Kormendy relation z=0 z=0.7

COSMOS: host galaxy luminosities

z=0.6z=1.0 COSMOS+GEMS: homogeneous inactive comparison samples

COSMOS+GEMS combined Radio detected

Results BL QSO host galaxies span colour range from reddish to blue  contribution of young starsBL QSO host galaxies span colour range from reddish to blue  contribution of young stars Bulge-dominated and elliptical hosts can be substantially bluer than inactive counterpartsBulge-dominated and elliptical hosts can be substantially bluer than inactive counterparts Confirmed for z=0 to 1.1 (SDSS+HES+GEMS)Confirmed for z=0 to 1.1 (SDSS+HES+GEMS) Merger/distortion fraction seems increased (to be tested!)Merger/distortion fraction seems increased (to be tested!) Moderate to substantial SF at z~2, similar to LBGsModerate to substantial SF at z~2, similar to LBGs Radio selected QSO are more luminous than optically selectedRadio selected QSO are more luminous than optically selected

Diagnostic power Differential host galaxy evolution compared to inactive galaxiesDifferential host galaxy evolution compared to inactive galaxies Influence of interaction on QSO activity (from merger fraction)Influence of interaction on QSO activity (from merger fraction) Test unified model for AGN from radio loud—quiet & type 1—type 2 comparison (luminosities, morphology)Test unified model for AGN from radio loud—quiet & type 1—type 2 comparison (luminosities, morphology) QSO host galaxy parent populationQSO host galaxy parent population With 2nd COSMOS HST band: spectrum of interaction strength triggering AGN activity (7/120 QSOs with NICMOS data)With 2nd COSMOS HST band: spectrum of interaction strength triggering AGN activity (7/120 QSOs with NICMOS data)

TBD Full sample definition and selection descriptionFull sample definition and selection description Time variable PSFTime variable PSF 2d modelling + peak subtraction2d modelling + peak subtraction Morphology analysis (Galfit et al.), direct comparison to inactive sampleMorphology analysis (Galfit et al.), direct comparison to inactive sample Analysis of radio propertiesAnalysis of radio properties