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The European Large Area ISO Survey - IX. The 90-mu m luminosity function from the Final Analysis sample

By Stephen Serjeant, Alberto Carraminana, Eduardo Gonzales-Solares, Philippe Heraudeau, Raul Mujica, Ismael Perez-Fournon, Nicola Sedgwick, Michael Rowan-Robinson, Alberto Franceschini, Tom Babbedge, Carlos del Burgo, Paolo Ciliegi, Andreas Efstathiou, Fabio La Franca, Carlotta Gruppioni, David Hughes, Carlo Lari, Seb Oliver, Francesca Pozzi, Manfred Stickel and Mattia Vaccari

Abstract

We present the 90-mum 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, similar to50 times the comoving volume of Paper IV, and 10(7.7) < h(-2) L/Lcircle dot < 10(12.5). From our optical spectroscopy campaigns of the northern ELAIS 90-mum survey (7.4 deg(2) in total, to S-90 (mum) > 70 mJy), we obtained redshifts for 61 per cent of the sample (151 redshifts) to B < 21 identified at 7 mum, 15 mum, 20 cm or with bright (B < 18.5) optical identifications. The selection function is well-defined, permitting the construction of the 90-mum 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 S 1 field from Paper IV. The luminosity function is also in good agreement with the recent IRAS-based prediction of Serjeant and Harrison - 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 less than or similar to 1 consistent with that derived from rest-frame optical and ultraviolet surveys

Topics: Q
Publisher: BLACKWELL PUBLISHING LTD, 9600 GARSINGTON RD, OXFORD OX4 2DG, OXON, ENGLAND
Year: 2004
OAI identifier: oai:kar.kent.ac.uk:11804
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