We present an estimate of the galaxy stellar mass function and its division by morphological type in the local (0.025 < z < 0.06) Universe. Adopting robust morphological classifications as previously presented (Kelvin et al.) for a sample of 3,727 galaxies taken from the Galaxy And Mass Assembly survey, we define a local volume and stellar mass limited sub-sample of 2,711 galaxies to a lower stellar mass limit of M = 10^9.0 M_sun. We confirm that the galaxy stellar mass function is well described by a double Schechter function given by M* = 10^10.64 M_sun, {\alpha}1 = -0.43, {\phi}*1 = 4.18 dex^-1 Mpc^-3, {\alpha}2 = -1.50 and {\phi}*2 = 0.74 dex^-1 Mpc^-3. The constituent morphological-type stellar mass functions are well sampled above our lower stellar mass limit, excepting the faint little blue spheroid population of galaxies. We find approximately 71+3-4% of the stellar mass in the local Universe is found within spheroid dominated galaxies; ellipticals and S0-Sas. The remaining 29+4-3% falls predominantly within late type disk dominated systems, Sab-Scds and Sd-Irrs. Adopting reasonable bulge-to-total ratios implies that approximately half the stellar mass today resides in spheroidal structures, and half in disk structures. Within this local sample, we find approximate stellar mass proportions for E : S0-Sa : Sab-Scd : Sd-Irr of 34 : 37 : 24 : 5.
@article{arxiv.1407.7555,
title = {Galaxy And Mass Assembly (GAMA): Stellar mass functions by Hubble type},
author = {Lee S. Kelvin and Simon P. Driver and Aaron S. G. Robotham and Edward N. Taylor and Alister W. Graham and Mehmet Alpaslan and Ivan Baldry and Steven P. Bamford and Amanda E. Bauer and Joss Bland-Hawthorn and Michael J. I. Brown and Matthew Colless and Christopher J. Conselice and Benne W. Holwerda and Andrew M. Hopkins and Maritza A. Lara-López and Jochen Liske and Ángel R. López-Sánchez and Jon Loveday and Peder Norberg and Steven Phillipps and Cristina C. Popescu and Matthew Prescott and Anne E. Sansom and Richard J. Tuffs},
journal= {arXiv preprint arXiv:1407.7555},
year = {2015}
}
Comments
16 pages, 6 figures, accepted for publication in MNRAS (see MNRAS version for high-quality figures)