!"#$"%&'()*+($%,-.-,/(-"(

0123423(5$6$7/(8$-9:

Kavli Institute for thePhysics andMathematics of theUniverse

!"#$%&'()*+,-$;(<$=&6(>$?8%0/@;(

>"A'(B$#"@&;(3C(D-66/($"'(E0F123423

JDS et al. 2011

G",9H'A%,-H"

."/%0"%1#*%234*+,-22')*%5(-67%#"(*2%8+"/9

I(?$::(,9$":8H9,(,H(,#&("A%6&A:

I(%H?8&,-"5(JH9%&:(

((E&C5C;(HA,KH=:;(9$'-$,-H"(89&::A9&F

I($%%9&,-H"(.:C(:,$9(JH9?$,-H"

2L:&9.$,-H"$6(%#$66&"5&:

CDFS QSO @ z=0.7Malte Schramm (IPMU)

:%;&<2%-+*%5+'8#1=

:%>#-1%0"%?"3%6",4-+*%/'1#9

+&=(,HH6:($,(#-5#I0

(-+8*%@24*61+"26"4'6A%23+)*?2%34%1"%BCD

(

I(5$6$7-&:(E0;(4!;(3MN:F

I()*+OP32:(E4QR;('4QRO',;(4!;(3MNF

STI9$/(:&6&%,-H"U

I(&".-9H"?&",:(ED33;(59HA8:;(8$-9:F(

AGNs in galaxy mergers: X-ray selected

Grogin et al. 2005

No AGN - merger connection

CDF-N

Chandra Deep Fields

Gabor et al. 2009; Cisternas et al. 2010; Kocevski et al 2011

0123423V()*+:;(#H:,:($"'(

6$95&9I:%$6&(&".-9H"?&",:

JDS et al. 2009a,b

red=AGN

0123423

‘Bright’ spectroscopic program (20k redshifts)0.25 < z < 1.05

PI: S. Lilly (ETH) & zCOSMOS team

0123423V(@-"&?$,-%(8$-9:

Kampczyk et al . 2011; de Ravel et al. 2011

Selection:

dr < 100 kpc h-1 (143 kpc for h=0.7)

dv < 500 km s-1

753 galaxies in pairs out of 3481 w/ log M > 10.4

563 (330) w/ mass ratio 10:1 (3:1)

0.6784

0.6762 0.6770

dr=37.4 kpc; dv=393.5 km s-1

dr=16.4 kpc; dv=143.1 km s-1

1.0095

z=1.0070

dr=73.8 kpc; dv=373.5 km s-1

1#$"'9$O123423

337 AGNs (0.1 < z <1) identified by

zCOSMOS/20k having LX > 1041 erg s-1

PI: M. Elvis

F. Civano (CfA), C. Vignali (Bologna), S. Puccetti (ASI), F. Fiore (INAF), T. Aldcroft (CfA) and the entire Chandra COSMOS team

3H?&("A?L&9:($"'(

&7$?86&:

Selection:

dr < 143 kpc

dv < 500 km s-1

AGN identification:

Chandra-detected

38 AGNs out of 562 galaxies in pairs

Control sample:

116 AGNs out of 2339 galaxies

19-,-%$6(-::A&:

• Spectroscopic sampling rates

- random (68%) vs. compulsory (95%) targets

- 30% X-ray sources are compulsory

• Incomplete identification of galaxy pairs

• Diffuse X-ray emission from groups(incidence of pairs rises with galaxy overdensity; Lin et al. 2010; de

Ravel et al. 2011; Kampczyk et al. 2011)

)*+(J9$%,-H"(EHL:&9.&'F

AGNs in pairs

(dr < 75 kpc)

AGNs in ‘field’

galaxies

)*+(J9$%,-H"(EHL:&9.&'F

AGN fraction in pairs (dr < 75 kpc): 9.8 +- 2.1 %

Control sample (AGNs not in pairs): 5.03+- 0.45 %

0123423V()*+:(-"(

5$6$7/(59HA8:

JDS et al. 2009a

(!"#$"%&?&",(-"(8$-9:(-:($(6H%$6(&W&%,X

zCOSMOS groups(Knobel et al. 2010)

)*+(J9$%,-H"(EHL:&9.&'F

AGN fraction in pairs (dr < 75 kpc): 9.8 +- 2.1 %

Control sample (AGNs not in pairs): 5.03+- 0.45 %

)*+(J9$%,-H"(EHL:&9.&'F

?

AGN fraction in pairs (dr < 75 kpc): 9.8 +- 2.1 %

Control sample (AGNs not in pairs): 5.03+- 0.45 %

)*+(J9$%,-H"(EG",9-":-%F

%E"$1*%F-+("%-44+"-6#EN&"&()"'9$&;(>"A'(B$#"@&(I4<G)F

I($%%HA",:(JH9(8$-9(-"%H?86&,&"&::

I($%%A9$,&(:,$,-:,-%$6(,9&$,?&",(HJ(:&6&%,-H"(&W&%,:

E&C5C;(%H?8A6:H9/O9$"'H?(,$95&,:F

)*+:(,9-55&9&'(:H6&6/(

L/(?&95&9:

dr < 75 kpc

~20% of all AGN activity occurs in early galaxy encounters

2,#&9(?&%#$"-:?:

!20% of all AGN activity occurs in galaxy encounters

D$,&(:,$5&(?&95&9(-"(,#&(%H",9H6(:$?86&

1H"%6A:-H":

Observational evidence for an enhancement (2.6x) of AGN activity in the early stages of galaxy mergers (dr < 75 kpc)

" consistent with recent SDSS results (Ellision et al. 2011; Liu et al. 2011)

" ! 20% black hole growth due to mergers

" similar to the impact on star formation (Pawel Kampcyk et al. 2011)

" Extend to high-z: Subaru/FMOS redshift survey @ 1.2 < z < 1.7