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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. 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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  1. 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

  2. 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.

  3. 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…

  4. Our results: I+AB<22.5 I+AB>22.5

  5. Our results: I+AB<22.5 I+AB>22.5

  6. Our results: . I+AB<22.5 I+AB>22.5

  7. HOW? • Correction for variability • New templates • Tons of photometric points WHAT IS MORE IMPORTANT ?

  8. About 2/5 of the XMM sample has clearly detected long term variability IB2 IB1 BB SDSS SUBARU

  9. Sources vary in a unpredictable way ? Additional ~1000 non X-ray detected galaxies are varying and there are currently under investigation

  10. Templates }QSO2+S0 Sy2 Sy1.8 I22491 }TQSO1+I22491 MRK231 M82 Sp Sb S0 QSO

  11. Relevance of templates and variability correction Both factors are crucial to reducing the number of outliers.

  12. Among other results: • Correct stellar/galaxy separation • Correct relation between hardness ratio and SED and variability • Correct relation between Xray luminosity and SED

  13. QSO selection at high z via Lyman break Siana et al. 2008

  14. Normal gals type II type I

  15. Thank you! . Ilbert et al Salvato et al.

  16. SUMMARY Variability effects your work more than you think…

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