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arXiv · 1407.7555

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

Lee S. Kelvin·Simon P. Driver·Aaron S. G. Robotham·Edward N. Taylor·Alister W. Graham·Mehmet Alpaslan·Ivan Baldry·Steven P. Bamford·Amanda E. Bauer·Joss Bland-Hawthorn·Michael J. I. Brown·Matthew Colless·Christopher J. Conselice·Benne W. Holwerda·Andrew M. Hopkins·Maritza A. Lara-López·Jochen Liske·Ángel R. López-Sánchez·Jon Loveday·Peder Norberg·Steven Phillipps·Cristina C. Popescu·Matthew Prescott·Anne E. Sansom·Richard J. Tuffs
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Abstract

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, α1 = -0.43, ϕ*1 = 4.18 dex^-1 Mpc^-3, α2 = -1.50 and ϕ*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.

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Lee S. Kelvin, Simon P. Driver, Aaron S. G. Robotham, Edward N. Taylor, Alister W. Graham, Mehmet Alpaslan, Ivan Baldry, Steven P. Bamford, Amanda E. Bauer, Joss Bland-Hawthorn, Michael J. I. Brown, Matthew Colless, Christopher J. Conselice, Benne W. Holwerda, Andrew M. Hopkins, Maritza A. Lara-López, Jochen Liske, Ángel R. López-Sánchez, Jon Loveday, Peder Norberg, Steven Phillipps, Cristina C. Popescu, Matthew Prescott, Anne E. Sansom, Richard J. Tuffs. 2014-07-28. Galaxy And Mass Assembly (GAMA): Stellar mass functions by Hubble type. https://doi.org/10.1093/mnras%2Fstu1507

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