Journal Article

Galaxy And Mass Assembly (GAMA): the galaxy stellar mass function at <i>z</i> < 0.06

I. K. Baldry, S. P. Driver, J. Loveday, E. N. Taylor, L. S. Kelvin, J. Liske, P. Norberg, A. S. G. Robotham, S. Brough, A. M. Hopkins, S. P. Bamford, J. A. Peacock, J. Bland-Hawthorn, C. J. Conselice, S. M. Croom, D. H. Jones, H. R. Parkinson, C. C. Popescu, M. Prescott, R. G. Sharp and R. J. Tuffs

in Monthly Notices of the Royal Astronomical Society

Published on behalf of The Royal Astronomical Society

Volume 421, issue 1, pages 621-634
Published in print March 2012 | ISSN: 0035-8711
Published online March 2012 | e-ISSN: 1365-2966 | DOI: http://dx.doi.org/10.1111/j.1365-2966.2012.20340.x
Galaxy And Mass Assembly (GAMA): the galaxy stellar mass function at z < 0.06

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We determine the low-redshift field galaxy stellar mass function (GSMF) using an area of 143 deg2 from the first three years of the Galaxy And Mass Assembly (GAMA) survey. The magnitude limits of this redshift survey are r < 19.4 mag over two-thirds and 19.8 mag over one-third of the area. The GSMF is determined from a sample of 5210 galaxies using a density-corrected maximum volume method. This efficiently overcomes the issue of fluctuations in the number density versus redshift. With H0= 70 km s−1 Mpc−1, the GSMF is well described between 108 and 1011.5 M using a double Schechter function with , , α1=−0.35, and α2=−1.47. This result is more robust to uncertainties in the flow-model corrected redshifts than from the shallower Sloan Digital Sky Survey main sample (r < 17.8 mag). The upturn in the GSMF is also seen directly in the i-band and K-band galaxy luminosity functions. Accurately measuring the GSMF below 108 M is possible within the GAMA survey volume but as expected requires deeper imaging data to address the contribution from low surface-brightness galaxies.

Keywords: galaxies: distances and redshifts; galaxies: fundamental parameters; galaxies: luminosity function, mass function

Journal Article.  10876 words.  Illustrated.

Subjects: Astronomy and Astrophysics

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