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Morphology of z ~ 1 galaxies from deep K-band AO imaging

Published online by Cambridge University Press:  01 August 2006

Marc Huertas-Company
Affiliation:
LESIA-Observatoire de Paris-Meudon email: marc.huertas@obspm.fr
Daniel Rouan
Affiliation:
LESIA-Observatoire de Paris-Meudon email: marc.huertas@obspm.fr
Geneviève Soucail
Affiliation:
LAT-Laboratoire d'Astrophysique de Toulouse
Olivier Le Fèvre
Affiliation:
LAM-Laboratoire d'Astrophysique de Marseille
Lidia Tasca
Affiliation:
LAM-Laboratoire d'Astrophysique de Marseille
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Abstract

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We present the results of observations of distant galaxies (z ~ 0.8) at high spatial resolution (~0.1"). We observed 7 fields of 1' × 1' with the NACO Adaptive Optics system (VLT) in Ks (2.2μm) band with typical V ~ 14 guide stars and 3h integration time per field. Observed fields are selected within the COSMOS survey area. We analyze the morphologies by means of B/D (Bulge/Disk) decomposition with GIM2D and CAS (Concentration-Asymmetry) estimators for 79 galaxies with magnitudes between Ks = 17 − 23 and classify them in three main morphological types (Late Type, Early Type and Irregulars). We obtain for the first time an estimate of the distribution of galaxy types at redshift z ~ 1 as measured from the near infrared at high spatial resolution.

Type
Contributed Papers
Copyright
Copyright © International Astronomical Union 2007