vincenzo mainieri
DESCRIPTION
Obscured and unobscured AGN in the XMM-COSMOS Survey. 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. The XMM-COSMOS survey (PI G. Hasinger). Area = 2 deg 2 - PowerPoint PPT PresentationTRANSCRIPT
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
Extragalatic Surveys, Cambridge MA, Nov 6-8, 2006Extragalatic Surveys, Cambridge MA, Nov 6-8, 2006
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
Extragalatic Surveys, Cambridge MA, Nov 6-8, 2006Extragalatic Surveys, Cambridge MA, Nov 6-8, 2006
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
Extragalatic Surveys, Cambridge MA, Nov 6-8, 2006Extragalatic Surveys, Cambridge MA, Nov 6-8, 2006
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
Extragalatic Surveys, Cambridge MA, Nov 6-8, 2006Extragalatic Surveys, Cambridge MA, Nov 6-8, 2006
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
Extragalatic Surveys, Cambridge MA, Nov 6-8, 2006Extragalatic Surveys, Cambridge MA, Nov 6-8, 2006
X-ray zoo
[0.5-2] [2-4.5] [4.5-10] keV
PL
APL
APL+soft
APL+Fe
Extragalatic Surveys, Cambridge MA, Nov 6-8, 2006Extragalatic Surveys, Cambridge MA, Nov 6-8, 2006
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
Extragalatic Surveys, Cambridge MA, Nov 6-8, 2006Extragalatic Surveys, Cambridge MA, Nov 6-8, 2006
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
Extragalatic Surveys, Cambridge MA, Nov 6-8, 2006Extragalatic Surveys, Cambridge MA, Nov 6-8, 2006
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%
Extragalatic Surveys, Cambridge MA, Nov 6-8, 2006Extragalatic Surveys, Cambridge MA, Nov 6-8, 2006
X-ray spectral properties catalogue
Extragalatic Surveys, Cambridge MA, Nov 6-8, 2006Extragalatic Surveys, Cambridge MA, Nov 6-8, 2006
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
Extragalatic Surveys, Cambridge MA, Nov 6-8, 2006Extragalatic Surveys, Cambridge MA, Nov 6-8, 2006
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?
Extragalatic Surveys, Cambridge MA, Nov 6-8, 2006Extragalatic Surveys, Cambridge MA, Nov 6-8, 2006
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
Extragalatic Surveys, Cambridge MA, Nov 6-8, 2006Extragalatic Surveys, Cambridge MA, Nov 6-8, 2006
xid=122
xid=70
xid=2237
z=2.418
z=0.688
z=0.941
Composite Sy2
Extragalatic Surveys, Cambridge MA, Nov 6-8, 2006Extragalatic Surveys, Cambridge MA, Nov 6-8, 2006
Guainazzi, Matt & Perola 2005Local (z=0) sample of Compton thick sources
Hasinger et al. 2006
Compton-thick
Extragalatic Surveys, Cambridge MA, Nov 6-8, 2006Extragalatic Surveys, Cambridge MA, Nov 6-8, 2006
25 arcsec
AC
S/H
ST
z=0.1248 (SDSS spectrum)
pexrav+gauss
…only 131 counts
Compton-thick
Extragalatic Surveys, Cambridge MA, Nov 6-8, 2006Extragalatic Surveys, Cambridge MA, Nov 6-8, 2006
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)