EDP Sciences Journals List
Advanced Search
Subscriber Authentication Point
Home All issues Volume 419/3 Article
Free access article

Issue A&A
Volume 419, Number 3, June I 2004
Page(s) L55 - L58
Section Letters
DOI http://dx.doi.org/10.1051/0004-6361:20040144



A&A 419, L55-L58 (2004)
DOI: 10.1051/0004-6361:20040144

Letter

ISOPHOT 95 $\mathsf{\mu}$m observations in the Lockman Hole

The catalogue and an assessment of the source counts
G. Rodighiero and A. Franceschini

Dipartimento di Astronomia, Università di Padova, Vicolo dell'Osservatorio 2, 35122 Padova, Italy
(Received 16 March 2004 / Accepted 15 April 2004)

Abstract
We report results from a new analysis of a deep 95  $\mu$m imaging survey with ISOPHOT on board the Infrared Space Observatory, over a ~1 deg 2 area within the Lockman Hole, which extends the statistics of our previous study (Rodighiero et al. 2003). Within the survey area we detect sixty-four sources with ${\it S/N}>3$ (roughly corresponding to a flux limit of 16 mJy). Extensive simulations indicate that the sample is almost complete at $S\!_{95 ~\mu \rm m} \geq 100$ mJy, while the incompleteness can be quantified down to ~30 mJy. The 95  $\mu$m galaxy counts reveal a steep slope at $S\!_{95 ~\mu\rm m} \le 100$ mJy ( $\alpha\simeq 1.6$), in excess of that expected for a non-evolving source population. In agreement with counts data from ISO at 15 and 175  $\mu$m, 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

Offprint request: G. Rodighiero, rodighiero@pd.astro.it

SIMBAD Objects



© ESO 2004


What is OpenURL?

The OpenURL standard is a protocol for transmission of metadata describing the resource that you wish to access. An OpenURL link contains article metadata and directs it to the OpenURL server of your choice. The OpenURL server can provide access to the resource and also offer complementary services (specific search engine, export of references...). The OpenURL link can be generated by different means.
  • If your librarian has set up your subscription with an OpenURL resolver, OpenURL links appear automatically on the abstract pages.
  • You can define your own OpenURL resolver with your EDPS Account. In this case your choice will be given priority over that of your library.
  • You can use an add-on for your browser (Firefox or I.E.) to display OpenURL links on a page (see http://www.openly.com/openurlref/). You should disable this module if you wish to use the OpenURL server that you or your library have defined.