the space density of compton thick agn
DESCRIPTION
The Space Density of Compton Thick AGN. Erin Bonning (Yale) On behalf of Ezequiel Treister (ESO). Meg Urry (Yale) Shanil Virani (Yale). Compton Thick AGN. Defined as obscured sources with N H >10 24 cm -2 . Very hard to find (even in X-rays). - PowerPoint PPT PresentationTRANSCRIPT
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The Space Density of The Space Density of Compton Thick AGNCompton Thick AGN
Erin Bonning (Yale)On behalf of Ezequiel Treister
(ESO) Meg Urry (Yale)
Shanil Virani (Yale)
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Compton Thick AGNCompton Thick AGN
Defined as obscured sources with NH>1024 cm-2.
Very hard to find (even in X-rays). Observed locally and needed to
explain the X-ray background. Number density highly uncertain. High energy (E>10 keV)
observations are required to find them.
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INTEGRAL SurveyINTEGRAL Survey
• 2 Msec (expected 3 Msec by summer 2008) Deepest extragalactic INTEGRAL survey
• XMM-LSS field• Flux limit: ~4x10-12 ergs cm-2 s-1 (20-40 keV)• Area: ~1,000 deg2
• 10 Sources, ~2 Compton thick AGN
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INTEGRAL Mosaic (2.2 Ms)INTEGRAL Mosaic (2.2 Ms)
Significance Image, 20-50 keVSignificance Image, 20-50 keV
MCG-02-08-014MCG-02-08-014
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Maximum depth: 2.2 Ms (inner contour)
Exposure MapExposure Map
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INTEGRAL Flux Limit vs. Exposure Time
Flim t–1/2
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Space Density of CT AGNSpace Density of CT AGN
X-ray background does not constrain density of CT AGN
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CT AGN and the XRBCT AGN and the XRB XRB IntensityHEAO-1 OriginalHEAO-1 +10%HEAO-1 +40%
Treister & Urry, 2005
Gilli et al. 2007
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CT AGN and the XRBCT AGN and the XRB XRB IntensityHEAO-1 OriginalHEAO-1 +10%HEAO-1 +40%
Treister & Urry, 2005
CT AGN Space Density
Most likely solution
Gilli et al. 2007
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X-ray Background X-ray Background SynthesisSynthesis
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INTEGRAL AGN logN-logSINTEGRAL AGN logN-logS
Beckmann et al. 2006
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(Near) Future AGN logN-(Near) Future AGN logN-logSlogS
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SummarySummary
• INTEGRAL (& Swift) give important constraints on Compton Thick AGN (at z=0)
• X-ray “background” synthesis OK– (but XRBG spectrum somewhat
uncertain)• Reflection component normalization ~ 1
– (agrees with spectra)• Deeper surveys probe evolution to z~1
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INTEGRAL Mosaic (2.2 Ms)INTEGRAL Mosaic (2.2 Ms)
Significance Image, 20-50 keVSignificance Image, 20-50 keV