Astronomy and Astrophysics, volume 375, 1-13 (2001/8-3)
Deep near-IR observations of the Chandra Deep Field and of the HDF South. Color and number counts.
SARACCO P., GIALLONGO E., CRISTIANI S., D'ODORICO S., FONTANA A., IOVINO A., POLI F. and VANZELLA E.
Abstract (from CDS):
We present near-IR (J and Ks) number counts and colors of galaxies detected in deep VLT-ISAAC images centered on the Chandra Deep Field and Hubble Deep Field-South for a total area of 13.6arcmin2. The limiting surface brightness obtained is Ks≃22.8mag/arcsec2 and J≃24.5 (1σ) on both fields. A dlogN/dm relation with a slope of ∼0.34 in J and ∼0.28 in Ks is found in both fields with no evidence of decline near the magnitude limit. The median J-Ks color of galaxies becomes bluer at magnitudes fainter than Ks∼18, in agreement with the different number counts slope observed in the two bands. We find a fraction (≤5% of the total sample) of sources with color redder than J-Ks=2.3 at magnitudes Ks>20. Most of them appear as isolated sources, possibly elliptical or dusty starburst galaxies at redshift z>2. The comparison of the observed number counts with models shows that our J-band and Ks-band counts are consistent with the prediction of a model based on a small amount of merging in a Ω=1 cosmology. On the other hand, we fail to reproduce the observed counts if we do not consider merging independently of the parameters defining the universe.
cosmology: large scale structure of the Universe - galaxies: general
VizieR on-line data:
<Available at CDS (J/A+A/375/1): cdfkcat.dat hdfkcat.dat>
Table CDF: [SGC2001] CDF NNN (Nos 1-332). Table HDFS: [SGC2001] HDFS NNN N=414 among (Nos 1-475).
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