Galaxy And Mass Assembly (GAMA) : stellar mass functions by Hubble type
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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 3727 galaxies taken from the Galaxy And Mass Assembly survey, we define a local volume and stellar mass limited sub-sample of 2711 galaxies to a lower stellar mass limit of M = 109.0 MΘ. We confirm that the galaxy stellar mass function is well described by a double-Schechter function given by Μ* = 1010.64 MΘ, α1 = 0.43, φ1* = 4.18 dex-1 Mpc-3, α2 = −1.50 and φ2* = 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 71-4+3 per cent of the stellar mass in the local Universe is found within spheroid-dominated galaxies; ellipticals and S0-Sas. The remaining 29-3+4 per cent falls predominantly within late-type disc-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 disc structures. Within this local sample, we find approximate stellar mass proportions for E : S0-Sa : Sab-Scd : Sd-Irr of 34 : 37 : 24 :5.
Kelvin , L S , Driver , S P , Robotham , A S G , Taylor , E N , Graham , A W , Alpaslan , M , Baldry , I , Bamford , S P , Bauer , A E , Bland-Hawthorn , J , Brown , M J I , Colless , M , Conselice , C J , Holwerda , B W , Hopkins , A M , Lara-Lopez , M A , Liske , J , Lopez-Sanchez , A R , Loveday , J , Norberg , P , Phillipps , S , Popescu , C C , Prescott , M , Sansom , A E & Tuffs , R J 2014 , ' Galaxy And Mass Assembly (GAMA) : stellar mass functions by Hubble type ' Monthly Notices of the Royal Astronomical Society , vol 444 , no. 2 , pp. 1647-1659 . DOI: 10.1093/mnras/stu1507
Monthly Notices of the Royal Astronomical Society
This article has been accepted for publication in Monthly Notices of the Royal Astronomical Society ©: 2014 The Authors, Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved.
This work was supported by the Austrian Science Foundation FWF under grant P23946. AWG was supported under the Australian Research Council's funding scheme FT110100263.
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