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Astron. Astrophys. 353, 867-872 (2000)

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A wide field survey at the Northern Ecliptic Pole

I. Number counts and angular correlation functions in K *

M.W. Kümmel 1,2 and S.J. Wagner

1 Landessternwarte Heidelberg-Königstuhl, Königstuhl 12, 69117 Heidelberg, Germany (swagner@lsw.uni-heidelberg.de; Kuemmel@mpia-hd.mpg.de)
2 Present address: Max-Planck-Institut für Astronomie, Königstuhl 17, 69117 Heidelberg, Germany

Received 6 May 1999 / Accepted 5 November 1999

Abstract

We present the results from a multi colour survey performed at the Northern Ecliptic Pole (NEP). The survey is designed to identify the counterparts of faint sources from the ROSAT All Sky Survey and the IRAS survey and to study their optical/near-infrared properties. We observed the central square degree around the NEP in the optical bands [FORMULA] and R and in the near-infrared band K. A shallower survey was carried out in the optical I band. Here we present the results of the K-band survey. We discuss the source counts in the magnitude range [FORMULA] and the angular correlation function of galaxies with [FORMULA]. The galaxy counts at the NEP display a subeuklidean slope in [FORMULA]. Our shallower slope does not require the large effects of galaxy evolution or density evolution suggested to explain the steeper slopes found in earlier surveys. The angular correlation function of galaxies follows a power law [FORMULA] with [FORMULA] and [FORMULA]. This is in accordance with the expected values for stable clustering.

Key words: surveys – galaxies: evolution – galaxies: photometry – galaxies: statistics – cosmology: large-scale structure of Universe – infrared: galaxies

* 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

Send offprint requests to: M.W. Kümmel

Correspondence to: Kuemmel@mpia-hd.mpg.de

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© European Southern Observatory (ESO) 2000

Online publication: January 18, 2000
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