Observations of the Hubble Deep Field with the Infrared Space Observatory. II. Source detection and photometry

Abstract

We present positions and fluxes of point sources found in the Infrared Space Observatory (ISO) images of the Hubble Deep Field (HDF) at 6.7 and 15 micron. We have constructed algorithmically selected ``complete'' flux-limited samples of 19 sources in the 15 micron image, and 7 sources in the 6.7 micron image. The typical flux limit at 15 micron is 0.2 mJy and at 6.7 micron is 0.04 mJy. We have selected ``supplementary'' samples of 3 sources at 15 micron and 20 sources at 6.7 micron by eye. We discuss the completeness and reliability of the connected pixel source detect ion algorithm used, by comparing the intrinsic and estimated properties of simulated data, and also by estimating the noise properties of the real data. The most pessimistic estimate of the number of spurious sources in the ``complete'' samples is 1 at 15 micron and 2 at 6.7 micron, and in the ``supplementary'' lists is 1 at 15 micron and 5 at 6.7 micron.