ISOCAM observations in the Lockman Hole - I The 14.3 micron shallow survey: data reduction, catalogue, and optical identifications

Abstract

We present the image and catalogue of the 14.3 micron shallow survey of 0.55 square degrees in the region of the Lockman Hole (10h52m03s +57d21m46s, J2000) with the Infrared Space Observatory (ISO). The data have been analyzed with the recent algorithm by Lari et al. (2001) conceived to exploit ISO data in an optimal way, especially in the case of shallow surveys with low redundancy. Photometry has been accurately evaluated through extensive simulations and also the absolute calibration has been checked using a set of 21 stars detected at 14.3 micron, optical, and near-IR bands. On the basis of simulations, we evaluate that the survey is 80%, 50%, and 20% complete at 0.8, 0.6, and 0.45 mJy, respectively. Below the 20% completeness limit, fluxes are generally overestimated since the sources are preferentially detected if their positions correspond to positive oscillations of the noise. Moreover, from a comparison with the deep survey, we estimate that only sources brighter than 0.45 mJy are highly reliable. Only 5% of these sources do not have optical counterparts down to r'=25. Since none of the Spitzer imaging bands cover the 14.3 micron wavelength range, this data set will remain unique until the advent of the James Webb Space Telescope.

arXiv comment19 pages, 13 figures, A&A accepted

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• Source Counts at 15 microns from the AKARI NEP Survey
• ISOCAM observations in the Lockman Hole - II The 14.3 micron deep survey: data reduction, catalogue and source counts
• Optical identification of ISO far-infrared sources in the Lockman Hole using a deep VLA 1.4 GHz continuum survey
• Final Analysis of ELAIS 15 $\mu$m Observations : Method, Reduction and Catalogue
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• A far infrared view of the Lockman Hole from ISO 95 micron observations - II. Optical identifications and insights into the nature of the far-infrared sources