| Issue |
A&A
Volume 419, Number 3, June I 2004
|
|
|---|---|---|
| Page(s) | L55 - L58 | |
| Section | Letters | |
| DOI | https://doi.org/10.1051/0004-6361:20040144 | |
| 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, rodighiero@pd.astro.it
Received:
16
March
2004
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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