| Type |
Journal Article |
| Names |
Wei-Hao Wang, Lennox L. Cowie, Amy J. Barger, Ryan C. Keenan, Hsiao-Chiang Ting |
| Publication |
The Astrophysical Journal Supplement Series |
| Volume |
187 |
| Issue |
1 |
| Pages |
251-271 |
| Date |
March 1, 2010 |
| URL |
http://adsabs.harvard.edu/abs/2010ApJS..187..251W |
| Library Catalog |
NASA ADS |
| Abstract |
We present an ultradeep KS -band image that covers 0.5
× 0.5 deg2 centered on the Great Observatories Origins
Deep Survey-North (GOODS-N). The image reaches a 5σ depth of
K_{S,\rm AB}=24.45 in the GOODS-N region, which is as deep as the
GOODS-N Spitzer Infrared Array Camera (IRAC) 3.6 μm image. We present
a new method of constructing IRAC catalogs that uses the higher spatial
resolution KS image and catalog as priors and iteratively
subtracts fluxes from the IRAC images to estimate the IRAC fluxes. Our
iterative method is different from the χ2 approach
adopted by other groups. We verified our results using data taken in two
different epochs of observations, as well as by comparing our colors
with the colors of stars and with the colors derived from model spectral
energy distributions of galaxies at various redshifts. We make available
to the community our WIRCam KS -band image and catalog
(94,951 objects in 0.25 deg2), the Interactive Data Language
pipeline used for reducing the WIRCam images, and our IRAC 3.6-8.0 μm
catalog (16,950 objects in 0.06 deg2 at 3.6 μm). With this
improved KS and IRAC catalog and a large spectroscopic sample
from our previous work, we study the color-magnitude and color-color
diagrams of galaxies. We compare the effectiveness of using
KS and IRAC colors to select active galactic nuclei and
galaxies at various redshifts. We also study a color selection of z =
0.65-1.2 galaxies using the KS , 3.6 μm, and 4.5 μm
bands.
Based on observations obtained at the Canada-France-Hawaii Telescope
(CFHT), which is operated by the National Research Council of Canada,
the Institut National des Sciences de l'Univers of the Centre National
de la Recherche Scientifique of France, and the University of Hawaii. |
| Tags |
GALAXIES: EVOLUTION, catalogs, cosmology: observations, galaxies: formation, galaxies: high-redshift, infrared: galaxies |