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Journal Article

Galaxy And Mass Assembly (GAMA): Stellar mass functions by Hubble type


Tuffs,  R.
Division Prof. Dr. Werner Hofmann, MPI for Nuclear Physics, Max Planck Society;

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Kelvin, L. S., Driver, S. P., Robotham, A. S. G., Taylor, E. N., Graham, A. W., Alpaslan, M., et al. (2014). Galaxy And Mass Assembly (GAMA): Stellar mass functions by Hubble type. Monthly Notices of the Royal Astronomical Society, 444, 1647-1659. doi:10.1093/mnras/stu1507.

Cite as: http://hdl.handle.net/11858/00-001M-0000-002C-053E-B
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.