The European Large Area ISO Survey IX: the 90 micron luminosity function from the Final Analysis sample

Details The European Large Area ISO Survey IX: the 90 micron luminosity function from the Final Analysis sample The European Large Area ISO Survey IX: the 90 micron luminosity function from the Final Analysis sample

2004-01-15

arxiv.org/abs/astro-ph/0401289v2

Astronomy and Astrophysics

Astrophysics

MNRAS accepted. 7 pages, 5 figures. Uses BoxedEPS (included)

Scientific paper

10.1111/j.1365-2966.2004.08358.x

We present the 90 micron luminosity function of the Final Analysis of the European Large Area ISO Survey (ELAIS), extending the sample size of our previous analysis (paper IV) by about a factor of 4. Our sample extends to z=1.1, around 50 times the comoving volume of paper IV, and 10^{7.7} < h^{-2}L/Lsun < 10^{12.5}. From our optical spectroscopy campaigns of the northern ELAIS 90 mircon survey (7.4 deg^2 in total, to S(90um)>70mJy), we obtained redshifts for 61% of the sample (151 redshifts) to B<21 identified at 7 microns, 15 microns, 20cm or with bright (B<18.5) optical identifications. The selection function is well-defined, permitting the construction of the 90 micron luminosity function of the Final Analysis catalogue in the ELAIS northern fields, which is in excellent agreement with our Preliminary Analysis luminosity function in the ELAIS S1 field from paper IV. The luminosity function is also in good agreement with the IRAS-based prediction of Serjeant & Harrison (2004), which if correct requires luminosity evolution of (1+z)^{3.4 +/- 1.0} for consistency with the source counts. This implies an evolution in comoving volume averaged star formation rate at z<~1 consistent with that derived from rest-frame optical and ultraviolet surveys.

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