Deep Chandra observation of WARPJ1415.1+3612 at z=1:

an evolved cool-core cluster at high-z

(and a bonus…)

P. Tozzi, M.Nonino (INAF-TS), P. Rosati (ESO), G. Giovannini (INAF-BO)M. Sanchez-Portal (ESAC)

Joana S. Santos (ESAC)

Galaxy Clusters as Giant Cosmic Laboratories

ESAC –Madrid 21-23 May 2012

Joana Santos - ESA 2

Cool-core clusters at high-z

CCs represent the bulk (50-70%) of the local cluster population (e.g. Hudson et al. 2010)

- Central surface brightness excess

- Central cooling time << tHUBBLE

- Temperature drop: Tc ~ 1/3 Ttot

- Strong Fe peak- Low entropy (< 30 kev cm2)

Up to z~1.4: moderate evolution (Santos et al. 2008, 2010) Most high-z clusters are mild

CCs

- SB concentration cSB: SB(r<40 kpc) / SB(r<400 kpc)

- cluster samples: RDCS, WARPS, 400SD Best target: WARPJ1415, z=1 (90 ksec Chandra ACIS-I)

3

Chandra ACIS I + S

370 ksec

280 ksec C12 PI JSantos

HST/ACS

~ 7500 cts9 bins spec analysis

Santos, Tozzi, Rosati, Nonino, Giovannini, 2012 A&A 539,105

WARPJ1415, z=1

4ACS i775-z850

Surface Brightness: β –model fit and cSB

cSB = 0.150 ± 0.007 (dividing line mod / strong CC )

5

ACS i775-z850

T drop: 4.6 – 8.0 keV

Fe peak: 3.6-0.9+1.5 Zsun

2s detections Si, S, Ni

Temperature and Metallicity

Leccardi & Molendi 2008

low-z

Mfeexc=1.8-0.5

+0.7 x109 Msun

Joana Santos - ESA 6ACS i775-z850

Entropy & Cooling time profiles

Joana Santos - ESA 7

CC parameter Archival 90 ksec Total 370 ksec

Tdrop -- 4.6 – 8.0 – 5.7 (keV)

Zfe,c -- 3.6-0.9+1.5 Zsun

cSB 0.144±0.016 0.150±0.007

tcool,c 3.4 Gyr 0.06±0.01 Gyr

K0 80 keV.cm2 9.9±2.0 keV.cm2

X-ray cool core estimators

The importance of deep data for high-z clusters!!

Joana Santos - ESA 8ACS i775-z850

Mass profile

• HE• T profile

• ne profile

Total massGas massWL (Jee et al. 2011)

Joana Santos - ESA 9ACS i775-z850

Radio VLA (res ~ 2”) Residual Chandra -β model

1’Nuclear emission:

L1.4GHz = 2.0x1025 W/Hz+ one sided jet/tail feature

X-rays + radio interaction

80 kpc

Asymmetry in SB: reg. 1 is 25% less luminous than reg.

2

1’ (480 kpc)

10

BCG - OII

The BCG

Subaru/Suprime BVRHST/ACS i775 - z850

EW[OII]=-25 A

SFR=2-8 Ms/yr

Joana Santos - ESA 11

Summary I

• WARPJ1415 is a “classical” cool-core cluster at z=1

With the deepest Chandra data of a high-z cluster (370 ksec) we measure: - temperature drop similar to the ones in local cc clusters

- high Fe peak: timescale for the build-up of Fe peak [2.4-3.5] Gyr

Feedback in action - radio source in the center + OII emission in the BCG:

• The X-ray properties of the cool-core in WARPJ1415 are

very similar to the ones of low-z cool-cores

• Ideal high-z cluster to study different components of

the cool-core phenomenon (optical, radio)

Joana Santos - ESA 12

BONUS!

Serendipitous discovery of a massive, z~1.5

cluster in the field of WARPJ1415

•

Joana Santos - ESA

Joana Santos - ESA 14

CXO1415 at zX=1.46 : ICM• best Chandra data of a z>1.4 cluster (~660 net counts)

• T=5.9 keV

• Fe= 1.3 Z/Zsun • Mass=M200=5x1014 Msun

Joana Santos - ESA 15

Subaru/Suprime BVR

Joana Santos - ESA 16

• red-sequence in place (>10 galaxies)

• few galaxies with distorted morphologies

CXO1415 at zX=1.46: galaxy population

Joana Santos - ESA 17

CXO1415 at zX=1.46: galaxy population

8 band photometry

zphot=1.50 (consistent with zX)

Joana Santos - ESA 18

To be continued in Tozzi et al. in prep. …

CXO1415 at zX=1.46