QSO host galaxy properties from GEMS and COSMOS from z=0 to 3

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Presentation transcript:

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 formation GEMS: 80 broad line QSOs (55 @ z<3) optically selected (COMBO17) photo-z‘s (COMBO17) ACS imaging F606W (=V), F850LP (=z) COSMOS: 120 broad line QSOs (25 March 06) optically selected (SDSS & SDSS+MMT) radio selected (VLA-COSMOS) spectro-z‘s (IMACS, zCOSMOS, SDSS) ACS imaging F814W (=i)

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

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

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

0.3–0.7 0.9–1.0 1.0–1.15 1.15–1.3 1.3–1.5 1.5–1.6 1.6–1.8 1.8–1.9 1.9–2.1 2.1–2.9 z = COSMOS ACS F814W 4“

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

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

0.3–0.7 0.9–1.0 1.0–1.15 1.15–1.3 1.3–1.5 1.5–1.6 1.6–1.8 1.8–1.9 1.9–2.1 2.1–2.9 z =

Current status & knowledge COSMOS: ~50 resolved type 1 QSO hosts GEMS: ~45 resolved (with optical colour) Sanchez et al. 2004 Jahnke et al. 2004 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)

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

GEMS z=0.7 Kormendy relation

COSMOS: host galaxy luminosities

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

COSMOS+GEMS combined Radio detected

Results BL 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 counterparts Confirmed for z=0 to 1.1 (SDSS+HES+GEMS) Merger/distortion fraction seems increased (to be tested!) Moderate to substantial SF at z~2, similar to LBGs Radio selected QSO hosts @z=1 are more luminous than optically selected

Diagnostic power Differential host galaxy evolution compared to inactive galaxies 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) QSO host galaxy parent population With 2nd COSMOS HST band: spectrum of interaction strength triggering AGN activity (7/120 QSOs with NICMOS data)

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