Volume 368, Number 3, March IV 2001
|Page(s)||787 - 796|
|Section||Cosmology (including clusters of galaxies)|
|Published online||15 March 2001|
The Calar Alto Deep Imaging Survey: K-band Galaxy number counts*
Present address: Harvard-Smithsonian Center for Astrophysics, 60 Garden Street, Cambridge, MA 02138, USA
2 Max-Planck Institut für Astronomie, Königstuhl 17, 69117 Heidelberg, Germany
3 Present address: California Institute of Technology, MS 320-47, Pasadena, CA 91125, USA
4 Present address: STScI, 3700 San Martin Dr., Baltimore, MD 21218, USA
Corresponding author: J.-S. Huang, firstname.lastname@example.org
Accepted: 4 January 2001
We present K-band number counts for the faint galaxies in the Calar Alto Deep Imaging Survey (CADIS). We covered 4 CADIS fields, a total area of , in the broad band filters B, R and K. We detect about 4000 galaxies in the K-band images, with a completeness limit of , and derive the K-band galaxy number counts in the range of . This is the largest medium deep K-band survey to date in this magnitude range. The B- and R-band number counts are also derived, down to completeness limits of and . The K-selected galaxies in this magnitude range are of particular interest, since some medium deep near-infrared surveys have identified breaks of both the slope of the K-band number counts and the mean color at . There is, however, a significant disagreement in the K-band number counts among the existing surveys. Our large near-infrared selected galaxy sample allows us to establish the presence of a clear break in the slope at from dlog N/dm = 0.64 at brighter magnitudes to dlog N/dm = 0.36 at the fainter end. We construct no-evolution and passive evolution models, and find that the passive evolution model can simultaneously fit the B-, R- and K-band number counts well. The colors show a clear trend to bluer colors for . We also find that most of the - galaxies have a color bluer than the prediction of a no-evolution model for an Sbc galaxy, implying either significant evolution, even for massive galaxies, or the existence of an extra population of small galaxies.
Key words: cosmology: observations / galaxies: evolution / galaxy: formation / surveys / infrared: galaxies
© ESO, 2001
Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.
Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.
Initial download of the metrics may take a while.