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

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

Jun 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006sf2a.conf..341h&link_type=abstract

SF2A-2006: Proceedings of the Annual meeting of the French Society of Astronomy and Astrophysics Eds.: D. Barret, F. Casoli, G.

Astronomy and Astrophysics

Astrophysics

Scientific paper

We present the results of observations of distant galaxies (z˜0.8) at high spatial resolution (˜0.1") aiming at studying their morphological evolution. We observed 7 fields of 1'×1' with the NACO Adaptive Optics system (VLT) in Ks (2.2μ m) band with typical V˜14 guide stars and 3h integration time per field. The K-band has the key advantage to probe old stellar populations at these redshifts, enabling to determine galaxy morphological types unaffected by recent star formation, better linked to the underlying mass than classical optical morphology studies (HST). Observed fields are selected within the COSMOS survey area, in which multi-wavelength photometric and spectroscopic observations are on-going. 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 K_s=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.

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