| Type |
Journal Article |
| Names |
R. C. Keenan, L. Trouille, A. J. Barger, L. L. Cowie, W.-H. Wang |
| Publication |
The Astrophysical Journal Supplement Series |
| Volume |
186 |
| Issue |
1 |
| Pages |
94-110 |
| Date |
January 1, 2010 |
| Short Title |
An Extremely Deep, Wide-Field Near-Infrared Survey |
| URL |
http://adsabs.harvard.edu/abs/2010ApJS..186...94K |
| Library Catalog |
NASA ADS |
| Abstract |
We present a deep, wide-field near-infrared (NIR) survey over five
widely separated fields at high Galactic latitude covering a total of ~3
deg2 in J, H, and Ks . The deepest areas of the
data (~0.25 deg2) extend to a 5σ limiting magnitude of
JHKs >24 in the AB magnitude system. Although depth and
area vary from field to field, the overall depth and large area of this
data set make it one of the deepest wide-field NIR imaging surveys to
date. This paper discusses the observations, data reduction, and bright
galaxy counts in these fields. We compare the slope of the bright galaxy
counts with the Two Micron All Sky Survey and other counts from the
literature and explore the relationship between slope and supergalactic
latitude. The slope near the supergalactic equator is sub-Euclidean on
average, pointing to the possibility of a decreasing average space
density of galaxies by ~10%-15% over scales of ~250-350 Mpc. On the
contrary, the slope at high supergalactic latitudes is strongly
super-Euclidean on average, suggesting an increase in the space density
of galaxies as one moves from the voids just above and below the
supergalactic plane out to distances of ~250-350 Mpc. These results
suggest that local large scale structure could be responsible for large
discrepancies in the measured slope between different studies in the
past. In addition, the local universe away from the supergalactic plane
appears to be underdense by ~25%-100% relative to the space densities of
a few hundred megaparsecs distant. |
| Tags |
GALAXIES: FUNDAMENTAL PARAMETERS, cosmology: observations |