The European Large Area ISO Survey IV: the preliminary 90 micron luminosity function

Details The European Large Area ISO Survey IV: the preliminary 90 micron luminosity function The European Large Area ISO Survey IV: the preliminary 90 micron luminosity function

2000-10-02

arxiv.org/abs/astro-ph/0010025v1

Mon.Not.Roy.Astron.Soc. 322 (2001) 262

Astronomy and Astrophysics

Astrophysics

MNRAS in press. 8 pages. Uses BoxedEPS (included). For more information on the ELAIS project see http://athena.ph.ic.ac.uk:80/

Scientific paper

10.1046/j.1365-8711.2001.04062.x

We present the luminosity function of 90um selected galaxies from the European Large Area ISO Survey (ELAIS), extending to z=0.3. Their luminosities are in the range 10^9 < h_65^-2 L/Lsun < 10^12, i.e. non-ultraluminous. From our sample of 37 reliably detected galaxies in the ELAIS S1 region from the Efstathiou et al. (2000) S_90 >= 100mJy database, we found optical, 15um or 1.4GHz identifications for 24 (65%). We have obtained 2dF and UK Schmidt FLAIR spectroscopy of 89% of IDs to rigid multivariate flux limits. We construct a luminosity function assuming (a) our spectroscopic subset is an unbiased sparse sample, and (b) there are no galaxies which would not be represented in our spectroscopic sample at {\it any} redshift. We argue that we can be confident of both assumptions. We find the luminosity function is well-described by the local 100um luminosity function of Rowan-Robinson, Helou & Walker (1987). {\it Assuming} this local normalisation, we derive luminosity evolution of (1+z)^{2.45\pm0.85} (95% confidence). We argue that star formation dominates the bolometric luminosities of these galaxies and we derive comoving star formation rates in broad agreement with the Flores et al. (1999) and Rowan-Robinson et al. (1997) mid-IR-based estimates.

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