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The faint end of the 250 μm luminosity function at z < 0.5.

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


Aims. We aim to study the 250 μm luminosity function (LF) down to much fainter luminosities than achieved by previous efforts. Methods. We developed a modified stacking method to reconstruct the 250 μm 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 μm 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 (~ 25 times fainter) than achieved by previous studies. We find strong positive luminosity evolution L*250(z)∝(1+z)4.89±1.07 and moderate negative density evolution Φ*250(z)∝(1+z)-1.02±0.54 over the redshift range 0.02 <z< 0.5.

Item Type:Article
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Publisher statement:Reproduced with permission from Astronomy & Astrophysics, © ESO.
Date accepted:01 July 2016
Date deposited:06 October 2016
Date of first online publication:01 August 2016
Date first made open access:06 October 2016

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