Quasars: old black holes with young stars (?)

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Presentation transcript:

Quasars: old black holes with young stars (?) Knud Jahnke Max-Planck-Institut für Astronomie, Heidelberg (?) Sebastián F. Sánchez (CAHA) Lutz Wisotzki (AIP) Asmus Böhm (AIP) Isabelle Gavignaud (AIP) +the GEMS team Eva Schinnerer (MPIA) Vernesa Smolcic (MPIA) +the COSMOS team(s) Frederic Courbin (Lausanne) Geraldine Letawe (Liege) Lutz Wisotzki et al.

State of the art: luminous QSOs lie in massive bulges (not only E) most BH mass accretion in high-L type 1 QSOs accretion at 10%—100% Eddington Goals: state & evolution of QSO host galaxies role of QSOs in general galaxy formation & evolution (and vice versa) host diagnostics: luminosities, morphologies, stellar composition, gas state, interactions

Imaging and spectroscopy samples GEMS/E-CDFS: 80 type 1 QSOs (55 @ z<3) optically selected and photo-z‘s (COMBO17) V, z band optical ACS imaging COSMOS: 120 type 1 QSOs, z<2.5 (future: ~500) optically selected (SDSS & SDSS+MMT) radio selected (VLA-COSMOS) spectro-z‘s (IMACS, zCOSMOS, SDSS) i band ACS imaging VLT spectroscopy: 20 type 1 QSOs, 0.05<z<0.35 3 grisms optical, 3500—9000Å

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)

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“

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

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: ~50/120 resolved type 1 QSO hosts Jahnke et al. (in prep) GEMS: ~45 resolved (with optical colour) Sanchez et al. 2004 Jahnke et al. 2004 Others: Kukula/Dunlop et al., Hutchings et al., Falomo et al., Peng 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 mag-size relation Inactive: z=0.7 z=0

COSMOS: host galaxy luminosities

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

COSMOS+GEMS combined GOODS-MUSIC (Grazian et al. 2006) Radio detected

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 (5% of QSOs with NICMOS data); trying Subaru 0.5“ seeing data

QSO host spectroscopy: on-nucleus FORS slitlets Centered on QSO PSF star in the field

2d host galaxy spectrum total host

QSO host spectroscopy Jahnke et al., submitted to MNRAS

Sample 20 type 1 QSOs Hamburg/ESO survey 0.05 < z < 0.35 Imaging available

Property overview 20/20 successful host galaxy extraction 7 confirmed disk dominated, 2 bulge dominated 1 QSO with very faint host galaxy (upper limit) Publication: Courbin et al. 2002, A&A, 394, 863 Letawe et al. 2004, A&A, 424, 455 Magain et al. 2005, Nature, 437, 381 Letawe et al., submitted to MNRAS Jahnke et al., submitted to MNRAS

QSO host spectroscopy Trager et al. 1998 early type galaxies Kennicutt et al. 1992 late type galaxies Letawe et al., submitted to MNRAS

ISM state Letawe et al., submitted to MNRAS

rotation disturbed Letawe et al., submitted to MNRAS

Results/conclusions/summary BL QSO host galaxies are very luminous Radio selected type 1 QSO hosts @z=1 are (on average) more luminous than optically selected Host galaxies span colour range from reddish to blue  contribution of young stars Early type hosts can be substantially bluer/have younger stellar populations than inactive counterparts (confirmed for z<1.1, SDSS+HES+GEMS) No extreme starbursts! Moderate to substantial UV flux at z~2, similar to LBGs Merger/distortion fraction seems increased (to be quantified!)