Galaxy properties in different environments at z > 1.5 in the GOODS-NICMOS Survey

Details Galaxy properties in different environments at z > 1.5 in the GOODS-NICMOS Survey Galaxy properties in different environments at z > 1.5 in the GOODS-NICMOS Survey

2010-11-23

arxiv.org/abs/1011.5158v1

Astronomy and Astrophysics

Astrophysics

Cosmology and Extragalactic Astrophysics

5 pages, 3 figures, to appear in the proceedings of JENAM 2010, Symposium 2 "Environment and the Formation of Galaxies: 30 yea

Scientific paper

We present a study of the relationship between galaxy colour, stellar mass, and local galaxy density in a deep near-infrared imaging survey up to a redshift of z~3 using the GOODS NICMOS Survey (GNS). The GNS is a very deep, near-infrared Hubble Space Telescope survey imaging a total of 45 arcmin^2 in the GOODS fields, reaching a stellar mass completeness limit of M* = 10^9.5 M_sun at z=3. Using this data we measure galaxy local densities based on galaxy counts within a fixed aperture, as well as the distance to the 3rd, 5th and 7th nearest neighbour. We find a strong correlation between colour and stellar mass at all redshifts up to z~3. We do not find a strong correlation between colour and local density, however, the highest overdensities might be populated by a higher fraction of blue galaxies than average or underdense areas, indicating a possible reversal of the colour-density relation at high redshift. Our data suggests that the possible higher blue fraction at extreme overdensities might be due to a lack of massive red galaxies at the highest local densities.

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