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

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


Variability who cares or photometric redshift for xmm cosmos sources

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.


Variability who cares or photometric redshift for xmm cosmos sources

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…


Variability who cares or photometric redshift for xmm cosmos sources

Our results:

I+AB<22.5

I+AB>22.5


Variability who cares or photometric redshift for xmm cosmos sources

Our results:

I+AB<22.5

I+AB>22.5


Variability who cares or photometric redshift for xmm cosmos sources

Our results:

.

I+AB<22.5

I+AB>22.5


Variability who cares or photometric redshift for xmm cosmos sources

HOW?

  • Correction for variability

  • New templates

  • Tons of photometric points

WHAT IS MORE IMPORTANT ?


Variability who cares or photometric redshift for xmm cosmos sources

About 2/5 of the

XMM sample has

clearly detected

long term variability

IB2

IB1

BB

SDSS

SUBARU


Variability who cares or photometric redshift for xmm cosmos sources

Sources vary in a unpredictable way

?

Additional ~1000 non X-ray detected

galaxies are varying and there are

currently under investigation


Variability who cares or photometric redshift for xmm cosmos sources

Templates

}QSO2+S0

Sy2

Sy1.8

I22491

}TQSO1+I22491

MRK231

M82

Sp

Sb

S0

QSO


Variability who cares or photometric redshift for xmm cosmos sources

Relevance of templates and variability correction

Both factors are crucial to reducing the number of outliers.


Among other results

Among other results:

  • Correct stellar/galaxy separation

  • Correct relation between hardness ratio and SED and variability

  • Correct relation between Xray luminosity and SED


Variability who cares or photometric redshift for xmm cosmos sources

QSO selection at high z via Lyman break

Siana et al. 2008


Variability who cares or photometric redshift for xmm cosmos sources

Normal gals type II type I


Thank you

Thank you!

.

Ilbert et al Salvato et al.


Variability who cares or photometric redshift for xmm cosmos sources

SUMMARY

Variability effects your work more than you think…


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