Variability who cares or photometric redshift for xmm cosmos sources
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Variability: who cares? or…. Photometric redshift for XMM-COSMOS sources. M.Salvato, G. Hasinger, O. Ilbert, G. Zamorani, M.Brusa + COSMOS collaboration. Salvato et al. 2009,ApJ, accepted. In order to better understand the role (if any) of the

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Variability: who cares? or…. Photometric redshift for XMM-COSMOS sources

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Variability: who cares?or….Photometric redshift for XMM-COSMOS sources

M.Salvato, G. Hasinger, O. Ilbert, G. Zamorani, M.Brusa

+

COSMOS collaboration

Salvato et al. 2009,ApJ, accepted


In order to better understand the role (if any) of the

AGN phase in Galaxy evolution, a complete CENSUS of AGN is crucial.

get them all : Due to the interplay between host and

Active Nucleous, No criterion can exist

that can identify all AGN using a single

waveband (i.e. see talks at this conference).

get the right redshift: most of the sources are faint and we

must rely on photometric redshifts.


even for Xray selected AGN usually, for z<1, the accuracy is

not better than 0.06 (after removing 20% of outliers ...)

…or, in other words,

something linke this…


Our results:

I+AB<22.5

I+AB>22.5


Our results:

I+AB<22.5

I+AB>22.5


Our results:

.

I+AB<22.5

I+AB>22.5


HOW?

  • Correction for variability

  • New templates

  • Tons of photometric points

WHAT IS MORE IMPORTANT ?


About 2/5 of the

XMM sample has

clearly detected

long term variability

IB2

IB1

BB

SDSS

SUBARU


Sources vary in a unpredictable way

?

Additional ~1000 non X-ray detected

galaxies are varying and there are

currently under investigation


Templates

}QSO2+S0

Sy2

Sy1.8

I22491

}TQSO1+I22491

MRK231

M82

Sp

Sb

S0

QSO


Relevance of templates and variability correction

Both factors are crucial to reducing the number of outliers.


Among other results:

  • Correct stellar/galaxy separation

  • Correct relation between hardness ratio and SED and variability

  • Correct relation between Xray luminosity and SED


QSO selection at high z via Lyman break

Siana et al. 2008


Normal gals type II type I


Thank you!

.

Ilbert et al Salvato et al.


SUMMARY

Variability effects your work more than you think…


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