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J/A+A/427/773 ISOCAM 14.3mum Deep Survey in Lockman Hole (Rodighiero+, 2004)
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Beginning of ReadMe :J/A+A/427/773 ISOCAM 14.3mum Deep Survey in Lockman Hole (Rodighiero+, 2004)
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ISOCAM observations in the Lockman Hole.
II. The 14.3mum deep survey: data reduction, catalogue and source counts.
Rodighiero G., Lari C., Fadda D., Franceschini A., Elbaz D., Cesarsky C.
<Astron. Astrophys. 427, 773 (2004)>
=2004A&A...427..773R
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ADC_Keywords: Surveys ; Galaxies, IR
Mission_Name: ISO
Keywords: infrared: galaxies - galaxies: photometry - galaxies: statistics -
galaxies: evolution - cosmology: observations - methods: data analysis
Abstract:
We present a new analysis of the ISOCAM 14.3mum deep survey in a
20x20 square arcmin area in the Lockman Hole. This survey is
intermediate between the ultra-deep surveys and the shallow surveys in
the ELAIS fields. The data have been analyzed with the method
presented by Lari et al. (2001, Cat. J/MNRAS/325/1173). We have
produced a catalogue of 283 sources detected above the 5-sigma
threshold, with fluxes in the interval 0.1-8mJy. The catalogue is 90%
complete at 1mJy. The positional accuracy, estimated from the
cross-correlation of infrared and optical sources, is around
1.5arcsec. The search for the optical counterparts of the sources in
the survey is performed on a medium-deep r' band optical image
(5sigma depth of r'=25), making use of the radio detections when
available. The photometry has been checked through simulations and by
comparing the data with those presented in a shallower and more
extended ISOCAM survey in the Lockman Hole, that we have presented in
a companion paper. Only 15% of the 14.3mum sources do not have an
optical counterpart down to r'=25mag. We use the 6.7/14.3mum colour
as a star/galaxy separator, together with a visual inspection of the
optical image and an analysis of the observed Spectral Energy
Distribution of the ISOCAM sources. The stars in the sample turn out
to be only 6% of the sample. We discuss the 14.3mum counts of
extragalactic sources, combining our catalogue with that obtained from
the shallower ISOCAM survey. The data in the two surveys are
consistent, and our results fully support the claims in previous works
for the existence of an evolving population of infrared galaxies,
confirming the evident departure from non-evolutionary model
predictions.
Description:
ISOCAM LW3 14.3mum source catalogue in the deep Lockman Hole area
for highly reliable detections with flux >0.22mJy.