# The faint end of the 250 micron luminosity function at z < 0.5

Wang, L, Norberg, P, Bethermin, M, Bourne, N, Cooray, A, Cowley, W, Dunne, L, Dye, L, Eales, S, Farrah, D, Lacey, C, Loveday, J, Maddox, S, Oliver, S and Viero, M (2016) The faint end of the 250 micron luminosity function at z < 0.5. Astronomy and Astrophysics, 592. L5. ISSN 0004-6361

## Abstract

Aims. We aim to study the 250 micron luminosity function (LF) down to much fainter luminosities than achieved by previous efforts.

Methods. We developed a modified stacking method to reconstruct the 250 micron LF using optically selected galaxies from the SDSS survey and Herschel maps of the GAMA equatorial fields and Stripe 82. Our stacking method not only recovers the mean 250 micron luminosities of galaxies that are too faint to be individually detected, but also their underlying distribution functions.

Results. We find very good agreement with previous measurements in the overlapping luminosity range. More importantly, we are able to derive the LF down to much fainter luminosities (around 25 times fainter) than achieved by previous studies. We find strong positive luminosity evolution \propto (1 + z)^4.89\pm1.07 and moderate negative density evolution \propto (1 + z)^-1.02\pm0.54 over the redshift range z=[0.02, 0.5].

Item Type: Article Submillimeter: galaxies, Galaxies: statistics, Methods: statistical, Galaxies: evolution, Galaxies: abundances, Galaxies: luminosity function, mass function School of Mathematical and Physical Sciences > Physics and Astronomy Q Science > QB Astronomy Richard Chambers 08 Aug 2016 09:54 24 Mar 2017 02:46 http://sro.sussex.ac.uk/id/eprint/62265