Extragalatic Surveys, Cambridge MA, Nov 6-8, 2006 Vincenzo Mainieri G. Hasinger, N. Cappelluti, M. Brusa, F. Civano, A. Comastri, M. Elvis, A. Finoguenov,

Extragalatic Surveys, Cambridge MA, Nov 6-8, 2006Extragalatic Surveys, Cambridge MA, Nov 6-8, 2006

Vincenzo Mainieri

G. Hasinger, N. Cappelluti, M. Brusa, F. Civano, A. Comastri, M. Elvis,

A. Finoguenov, F. Fiore, R. Gilli, J. Silverman, C. Vignali & XMM-COSMOS team

Obscured and unobscured AGN Obscured and unobscured AGN in the in the

XMM-COSMOS SurveyXMM-COSMOS Survey


The XMM-COSMOS survey (PI G. Hasinger)

See Marcella Brusa’s talk on Tuesday

Area = 2 deg2

Flux limits:

[0.5-2] keV -> 7.0x10-16 cgs

[2-10] keV -> 3.3x10-15 cgs

[5-10] keV -> 1.0x10-14 cgs

1390 point-like X-ray sources

(Cappelluti et al. 2006)

1.4

d

eg


The sample

135 sources

Identified (z)

> 100 counts (0.3-10 keV)

Point-like

715 X-ray sources in the 12F

Optical Classification (Magellan&zCOSMOS): 86 BL AGN, 49 not BL AGN


The sample

135 sources

Identified (z)

> 100 counts (0.3-10 keV)

Point-like

715 X-ray sources in the 12F

Fai

ntF

aint

Bright

Bright

freeNH free

= 2.0NH free

180


Spectra extraction

1. Define source and background extraction regions (off-axis angle, S/N, nearby sources)

2. Extract spectrum and background for each single pointing

3. Combine spectrum and background coming from different pointings


X-ray zoo

[0.5-2] [2-4.5] [4.5-10] keV

PL

APL

APL+soft

APL+Fe


vsvs N NHH

NHgal=[2.5-2.9] x 1020 cm-2

Bright sample: 82 sources

• <> = 2.06 ± 0.08

• <> does not change with NH

• <> does not change with z


NH distribution

Bright + Faint sample

24% are absorbedNo BL AGN has NH>1022 cm-2 9% of BL AGN have NH>NH

gal

1 Compton thick candidate


Comparison between X-ray and optical classification

BLAGN

76%

NLAGN 19% NLAGN

41%

Gal 34%

Gal 5%

X-ray unabsorbed X-ray absorbed

2/3of NLAGN do not show X-ray absorption: 80% z>0.4 --> H outside 50% have MgII inside but not enough S/N

BLAGN

25%

NLAGN 41%

Gal 34%


X-ray spectral properties catalogue


Compare HR and NH values

90% of the sources with NH>1022 cm-2 have HR>-0.3

The only source outside this box shows soft excess in its X-ray spectra

99% of the sources with NH<1022 cm-2

have HR<-0.3


X/O vs NH

A tool to select obscured AGN:

60% X/O>10 are obscured (to be compare with the 23% for the full sample)

High-z candidates?


QSO-2 candidates

X-ray surveys are finding the radio quiet population of QSO-2

They are spanning a large redshift range: [0.7-2.4]

R-K ~ 4-5 (Vega)

Two are detected at 20cm: 540±24 Jy -> 9.8x1023 W/Hz 52±11 Jy -> 1.5x1023 W/Hz

For the other two: F20cm(4.5) ~ 50 Jy


xid=122

xid=70

xid=2237

z=2.418

z=0.688

z=0.941

Composite Sy2


Guainazzi, Matt & Perola 2005Local (z=0) sample of Compton thick sources

Hasinger et al. 2006

Compton-thick


25 arcsec

AC

S/H

ST

z=0.1248 (SDSS spectrum)

pexrav+gauss

…only 131 counts

Compton-thick


Conclusions

Best models in the 12F: PL (76%), APL (20%), other (Fe,pexrav,etc..) 4%

<>=2.06±0.08 (from 82 sources)

No correlation between and NH or z

We are building the observed NH distribution for a large and uniform sample of AGN

4 new QSO-2: their SED is well reproduced by a composite Sy2 spectrum

Significant detection of FeK in three objects, one new Compton-thick candidate

…more to come: the XMM-Newton data are all in hand and the spectroscopic follow-up is rapidly proceeding (Magellan & zCOSMOS)

Mainieri et al 2006, submitted to Apj (COSMOS ApJS issue)

Extragalatic Surveys, Cambridge MA, Nov 6-8, 2006 Vincenzo Mainieri G. Hasinger, N. Cappelluti, M. Brusa, F. Civano, A. Comastri, M. Elvis, A. Finoguenov,

Documents