Accueil > Séminaires d’Astrophysique > Automne 2006 > Tracing the evolution of galaxy clustering to z 1 with the Canada France Legacy Survey

 

Tracing the evolution of galaxy clustering to z 1 with the Canada France Legacy Survey

Henry Mc Cracken (IAP)

Par Stephane Charpinet - 8/01/2007

 

Séminaires d’Astrophysique

de l’Observatoire Midi-Pyrénées


Séminaire de

Henry Mc CRACKEN

 (IAP)


Jeudi 21 Septembre 2006 à 11h

LATT - Salle Coriolis


Tracing the evolution of galaxy clustering to z 1 with the Canada France Legacy Survey

I will present new results on the clustering of faint field galaxies based on a photometric redshift survey of 210,000 i*<24.5 galaxies extracted from the four deep fields of Canada-France Legacy Survey. For each of these galaxies we have derived absolute magnitudes and types using precise photometric redshifts ; our entire sample has a median redshift of 0.7. Using this unique sample we are able to investigate the dependence of galaxy clustering on absolute rest-frame luminosity, spectral type and redshift all the way from z 0.2 to z 1.2. We find that at all redshifts and luminosity ranges, the rest-frame absolute colour is the most important factor determining the comoving correlation length of the galaxy population. We also find that clustering properties of the faint elliptical population evolves in a quantitatively different manner than either brigher elliptical galaxies or spiral galaxies of all luminosities. At higher redshifts, an increasing proportion of blue starburst galaxies in luminosity-limited samples naturally explains the decrease in correlation lengths seen in our dataset. We will discuss our results in the context of current structure formation models and the prospects to extend this work to z 2 using data from WIRCAM.

 

 

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Laboratoire Astrophysique de Toulouse - Tarbes (UMR5572)

CNRS (Midi-Pyrénées)

Univ. Paul Sabatier

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