Counts, Sizes and Colors of Faint Infrared Selected Galaxies

Details Counts, Sizes and Colors of Faint Infrared Selected Galaxies Counts, Sizes and Colors of Faint Infrared Selected Galaxies

1999-04-06

arxiv.org/abs/astro-ph/9904069v1

Astrophys.Space Sci. 276 (2001) 991-998

Astronomy and Astrophysics

Astrophysics

8 pages, 5 figures, proc. of the Euroconference on "The Evolution of Galaxies on Cosmological Timescale", to appear in Ap&SS

Scientific paper

10.1023/A:1017580431492

Deep J and Ks band images covering a $5\times5$ arcmin area centered on the NTT Deep Field have been obtained during the Science Verification of SOFI at the NTT. These images were made available via the Web in early June. The preliminary results we have obtained by the analysis of these data are the following: 1) the counts continue to rise with no evidence of a turnover or of a flattening down to the limits of the survey (Ks=22.5 and J=24); 2) we find a slope $dlog(N)/dm\sim$0.37 in agreement with most of the faintest surveys but much steeper than the Hawaii survey; 3) fainter than Ks$\sim19$ and J$\sim20$, the median J-K color of galaxies shows a break in its reddening trend turning toward bluer colors; 4) faint bluer galaxies also display a larger compactness index, and a smaller apparent size.

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