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Observations of the Hubble Deep Field South with the Infrared Space Observatory– I. Observations, data reduction and mid-infrared source counts |
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| Authors: | Seb Oliver Robert G Mann Ruth Carballo Alberto Franceschini Michael Rowan-Robinson Maria Kontizas Anastasios Dapergolas Evanghelos Kontizas Aprajita Verma David Elbaz Gian Luigi Granato Laura Silva Dimitra Rigopoulou J Ignacio Gonzalez-Serrano Steve Serjeant reas Efstathiou Paul P van der Werf |
| Institution: | Astrophysics Group, Imperial College London, Blackett Laboratory, Prince Consort Road, London SW7 2BZ,; Astronomy Centre, School of Chemistry, Physics and Environmental Science, University of Sussex, Falmer, Brighton BN1 9QJ,; Institute for Astronomy, University of Edinburgh, Royal Observatory, Blackford Hill, Edinburgh EH9 3HJ,; Departamento de Matematica Aplicada y CC, Universidad de Cantabria, Avda. Los Castros s/n, 39005 Santander, Spain,; Instituto de Física de Cantabria (CSIC-UC), Avda. Los Castros s/n, 39005 Santander, Spain,; Dipartimento di Astronomia, Universita' di Padova, Vicolo dell'Osservatorio 5, I-35122, Padova, Italy,; Department of Physics, University of Athens, Panepistimiopolis, GR-15783, Zografos, Greece,; Astronomical Institute, National Observatory of Athens, Lofos Nymfon, Thission, PO Box 20048, 11810 Athens, Greece,; DSM/DAPNIA/SAp, CE–Saclay, Orme des Merisiers –Bat 709, 91191 Gif-sur-Yvette Cedex, France,; Astrophysics Sector, SISSA, Via Beirut 2-4, 34013 Trieste, Italy,; Max-Planck-Institut für extraterrestrische Physik, Postfach 1603, 85740 Garching, Germany,; Unit for Space Sciences and Astrophysics, School of Physical Sciences, University of Kent, Canterbury CT2 7NZ and; Leiden Observatory, PO Box 9513, NL-2300 RA Leiden, the Netherlands |
| Abstract: | We present results from a deep mid-infrared survey of the Hubble Deep Field South (HDF-S) region performed at 6.7 and 15 μm with the ISOCAM instrument on board the Infrared Space Observatory ( ISO ). The final map in each band was constructed by the co-addition of four independent rasters, registered using bright sources securely detected in all rasters, with the absolute astrometry being defined by a radio source detected at both 6.7 and 15 μm. We sought detections of bright sources in a circular region of radius 2.5 arcmin at the centre of each map, in a manner that simulations indicated would produce highly reliable and complete source catalogues using simple selection criteria. Merging source lists in the two bands yielded a catalogue of 35 distinct sources, which we calibrated photometrically using photospheric models of late-type stars detected in our data. We present extragalactic source count results in both bands, and discuss the constraints that they impose on models of galaxy evolution, given the volume of space sampled by this galaxy population. |
| Keywords: | surveys galaxies: evolution galaxies: formation galaxies: Seyfert galaxies: starburst infrared: galaxies |