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The Calar Alto Deep Imaging Survey: K-band Galaxy number counts

Huang, J.-S. and Thompson, D. and Kümmel, M. W. and Meisenheimer, K. and Wolf, C. and Beckwith, S. V. W. and Fockenbrock, R. and Fried, J. W. and Hippelein, H. and von Kuhlmann, B. and Phleps, S. and Röser, H.-J. and Thommes, E. (2001) The Calar Alto Deep Imaging Survey: K-band Galaxy number counts. Astronomy and Astrophysics, 368 (3). pp. 787-796. ISSN 0004-6361. doi:10.1051/0004-6361:20010057.

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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 0.2 deg^2, in the broad band filters B, R and K. We detect about 4000 galaxies in the K-band images, with a completeness limit of K = 19.75 mag, and derive the K-band galaxy number counts in the range of 14.25 < K < 19.75 mag. 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 B = 24.75 mag and R = 23.25 mag. 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 B - K color at K = 17 ~ 18 mag. 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 K = 17.0 mag 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 B - K colors show a clear trend to bluer colors for K > 18 mag. We also find that most of the K = 18 – 20 mag galaxies have a B - K color bluer than the prediction of a no-evolution model for an L⋆ Sbc galaxy, implying either significant evolution, even for massive galaxies, or the existence of an extra population of small galaxies.

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Wolf, C.0000-0002-4569-016X
Additional Information:© 2001 ESO. Article published by EDP Sciences. Received 17 April 2000; Accepted 4 January 2001; Published online 15 March 2001. Based on observations collected at the German-Spanish Astronomical Centre, Calar Alto, operated by the Max-Planck-Institut für Astronomie, Heidelberg, jointly with the Spanish National Commission for Astronomy.
Subject Keywords:cosmology: observations - galaxies: evolution - galaxy: formation - surveys - infrared: galaxies
Issue or Number:3
Record Number:CaltechAUTHORS:20180228-083611806
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Official Citation:The Calar Alto Deep Imaging Survey: K-band Galaxy number counts. J.-S. Huang, D. Thompson, M. W. Kümmel, K. Meisenheimer, C. Wolf, S. V. W. Beckwith, R. Fockenbrock, J. W. Fried, H. Hippelein, B. von Kuhlmann, S. Phleps, H.-J. Röser and E. Thommes. A&A, 368 3 (2001) 787-796. DOI:
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:84989
Deposited By: Tony Diaz
Deposited On:28 Feb 2018 20:09
Last Modified:15 Nov 2021 20:24

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