Mathematics – Logic
Scientific paper
Jan 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001iaus..204..215v&link_type=abstract
The Extragalactic Infrared Background and its Cosmological Implications, Proceedings of IAU Symposium #204, held 15-18 August 20
Mathematics
Logic
Scientific paper
We present new medium-deep, wide field galaxy counts at J- and K-bands, performed in the ELAIS fields. The source detection limits are at J=19.5 and K=18.0 magnitudes. The sky coverage is 1 degree2 making our survey the largest to date at these wavelengths and magnitudes. Counts in this brightness range are critical for normalization of models when explaining the deepest galaxy counts. In our survey fields we find evidence for a higher than expected local galaxy density. If normalized to our counts, galaxy models do not need strong brightness evolution or exotic populations to be explained even at the faintest levels. We measure clearly sub-Euclidean slopes of log N(m) / dm ~ 0.45 to 0.50 at 13 < K < 17.5 and 14.5 < J < 19. Normal passively evolving stellar populations along with a high normalization of the local luminosity function and an open cosmological model fit best both the slope and amplitude of our number counts. We compute the indicated extragalactic background light in the NIR and compare it to recent direct observations.
Tollestrup Eric V.
Vaisanen Pauli
Willner Steve P.
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