1 ringberg castle workshop on agn physics, 25.11.2004 agn hosts at 0.05

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AGN hosts at 0.05<z<2.7: Young stars and mergers?

Knud Jahnke (AIP), Lutz Wisotzki (AIP)

Sebastián F. Sánchez (AIP, CAHA/IAA)Björn Kuhlbrodt (AIP)

+ the GEMS collaboration:

Marco Barden, Eric Bell, Andrea Borch, Boris Häußler, Klaus Meisenheimer, Hans-Walter Rix (MPIA)

Steve Beckwith, Chien Peng, Rachel Somerville (STScI)

John Caldwell, Sharda Jogee (UT Austin)

Dan McIntosh (U Massachusetts)

Chris Wolf (Oxford)

© 2004, Knud Jahnke, http://www.aip.de/~jahnke

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Motivation:● Merger-AGN connection● Starburst-AGN connection

study type 1 AGN/quasar host galaxies up to high z● luminous AGN● large physical scales● colours/morphologies/asymmetries● use well selected samples

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4 MB ~ -23

MB ~ -21.5

MB ~ -24.5

AGN samples

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Hamburg/ESO quasar survey: southern extragalactic sky

● optical objective prism survey● targets bright QSOs, 13<BJ<17.5

● flux limited sample of 415 bright QSOs

COMBO-17 (PI C. Wolf): 4 x 30' x 30', ● 17 bands (UBVRI + 12 medium)● object classification, incl. broad-line AGN● spectrophotometric redshifts● 8,000 stars● 150,000 galaxies● 35,000 redshifts (R<24)● ~300 BL AGN

AGN samples

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AGN samplesz<0.2: BVRIJHK ground based photometry

z>0.5: GEMS (PI H.-W. Rix) ● E-CDFS, 30' x 30'● 80 HST ACS pointings● F606W (=V) + F850LP (=z) bands, 1 orbit/pointing/band● ~80 BL AGN + ~500 X-ray AGN (Chandra)

3 sub-samples:● 0.5<z<1.1: V<4000Å, z>4000Å, optical-UV colour● 1.1<z<1.8: V<4000Å, UV luminosity only● 1.8<z<2.75: V+z<4000Å, UV-UV colour

for 1.5<z<2.0: NICMOS imaging, cycle 13 (31 orbits granted)● optical-UV colour

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AGN samples

Selection criteria:● z<0.2: HES, complete, optically flux limited● z>0.5: COMBO-17 AGN class● R<24 (MB=-20...-24)

● 'Host galaxy resolved' criterion: >5% of total flux● 0.5<z<1.8: 2d modelling with GALFIT (C. Y. Peng et

al.)

0.05<z<0.2: 19 total 19 resolved




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AGN samples



al.)




1.8<z<2.75: 23 total 9 resolvedJahnke , Kuhlbrodt, Wisotzki, 2004, MNRAS, 325, 52

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0.05<z<0.2

HE 1254-0934, z=0.139

20 kpc

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0.05<z<0.2

HE 1300-1325, z=0.047

5 kpc

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0.05<z<0.2

HE 1029-1401, z=0.085

10 kpc

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Resolved: 19/19

Morphologies:

9/19: early type galaxies

10/19: late type galaxies

Distortions:

6/19: ongoing interaction

3/19: other asymmetries

0.05<z<0.2

~30-45% were/are tidally interacting

~55% show no signs of interaction

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0.05<z<0.2

optical-NIR colour-magnitude diagram

early type hosts

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Colours:

early type hosts blue compared to inactive (V-K)

as blue as late type hosts

but not starburst

young stellar component throughout host (not circumnuclear)

mix of young and underlying old

0.05<z<0.2

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AGN samples



al.)




1.8<z<2.75: 23 total 9 resolvedSánchez, Jahnke, Wisotzki, et al., 2004, ApJ, 614, 586

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0.5<z<1.1

COMBO-17 CDFS 42601, z=0.733

10 kpc

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0.5<z<1.1

COMBO-17 CDFS 15731, z=0.835

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0.5<z<1.1

COMBO-17 CDFS 47615, z=0.649

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0.5<z<1.1

COMBO-17 CDFS 39432, z=0.738

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Resolved: 15/15

Morphologies:

12/15: early type (by Sérsic fit)

3/15: likely disk dominated

Distortions:

4/15: probable ongoing interaction

3/15: other possible asymmetries

0.5<z<1.1

~25-50% were/are tidally interacting


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0.5<z<1.1

observed colours

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0.5<z<1.1

rest-frame colours

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0.5<z<1.1

Kormendy relation

z=0.7

z=0

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Colours of early type hosts:

5/12: globally blue

+4/12: at blue edge of red sequence

only 3/12: red

Host luminosities: MV=-18.5...-22.0

Stellar masses:

early type hosts right on z=0.7 Kormendy relation

so not unusual M/L, underlying old population?

0.5<z<1.1

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AGN samples



al.)





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1.1<z<1.8

COMBO-17 CDFS 18256, z=1.647

10 kpc

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1.1<z<1.8

COMBO-17 CDFS 54839, z=1.428

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1.1<z<1.8

COMBO-17 CDFS 16155, z=1.285

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1.1<z<1.8

COMBO-17 CDFS 04050, z=1.635

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Resolved: 13/19

Morphologies:

2/13: likely disk dominated (by Sérsic fit)

11/13: undecidable

Distortions:

5/13 resolved, symmetric

1/5: knots (but likely PSF-structure)

2/5: nearby (<1.5'') companions

8/13 resolved with asymmetries or extensions

1.1<z<1.8

~60% were/are tidally interacting


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1.1<z<1.8

200nm luminosity/SFR vs. redshift

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Colours: N/A

Luminosities:

few 1028 erg/s/Å (at 200nm)

few Msun/yr star formation (if starforming)

not strong starburst

1.1<z<1.8

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AGN samples



al.)




1.8<z<2.75: 23 total 9 resolvedJahnke, Sánchez, Wisotzki, et al., 2004, ApJ, 614, 568

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1.8<z<2.75

COMBO-17 CDFS 05498, z=2.075

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1.8<z<2.75

COMBO-17 CDFS 11922, z=2.539

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1.8<z<2.75

UV spectral slope vs. 200nm mag

LBGs (z=2.5)

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1.8<z<2.75

200nm luminosity/SFR vs. redshift

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1.8<z<2.75

UV colour vs. redshift

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Colours: ● slightly UV-redder than LBGs● young stellar component● but not in starburst-phase

UV luminosities:● similar to LBGs● either: post-starburst young population● or: ongoing starformation (5 Msun/yr from UV)

1.8<z<2.75

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Some conclusions

many hosts:● globally young stellar populations, from z=0.1 to 2.8● many blue early type host galaxies● at z=2: UV light similar LBG

merging vs. no interaction (z<1.8):

z<0.2: 30% merger, 15% possibly interacting, 55% smooth

0.5<z<1.1: 25% merger, 25% possibly interacting, 50% smooth

1.1<z<1.8: 60% possibly interacting, 40% smooth

tentative: merger fraction increasing with z

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Some more conclusions

Two options: delay or gas rich E's

1) Delay/evolutionary sequence?● progenitor → merger/starburst → delay → AGN● colour: upper limit for delay (few 100 Myr)● (smooth) morphology: lower limit for delay (few 100 Myr)

2) Gas rich early type host plus intermittent AGN phase● explains smooth early type hosts● so is only gas-richness special?

Diagnostics?● stellar population age dating AGN hosts ● search for merger signs in smooth hosts

insert your favoritephysics here

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~fin~

1 ringberg castle workshop on agn physics, 25.11.2004 agn hosts at 0.05

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