Volume 419, Number 3, June I 2004
|Page(s)||L55 - L58|
|Published online||07 May 2004|
Letter to the Editor
ISOPHOT 95 m observations in the Lockman Hole*
The catalogue and an assessment of the source counts
Dipartimento di Astronomia, Università di Padova, Vicolo dell'Osservatorio 2, 35122 Padova, Italy
Corresponding author: G. Rodighiero, email@example.com
Accepted: 15 April 2004
We report results from a new analysis of a deep 95 μm imaging survey with ISOPHOT on board the Infrared Space Observatory, over a ~1 deg2 area within the Lockman Hole, which extends the statistics of our previous study (Rodighiero et al. [CITE]). Within the survey area we detect sixty-four sources with (roughly corresponding to a flux limit of 16 mJy). Extensive simulations indicate that the sample is almost complete at mJy, while the incompleteness can be quantified down to ~30 mJy. The 95 μm galaxy counts reveal a steep slope at mJy (), in excess of that expected for a non-evolving source population. In agreement with counts data from ISO at 15 and 175 μm, this favours a model where the IR populations evolve both in number and luminosity densities. We finally comment on some differences found with other ISO results in this area.
Key words: infrared: galaxies / galaxies: photometry, statistics, evolution
© ESO, 2004
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