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

Kelvin, Lee S, Driver, Simon P, Robotham, Aaron S G, Taylor, Edward N, Graham, Alister W, Alpaslan, Mehmet, Baldry, Ivan, Bamford, Steven P, Bauer, Amanda E, Bland-Hawthorn, Joss, Brown, Michael J I, Colless, Matthew, Conselice, Christopher J, Holwerda, Benne W, Hopkins, Andrew M, Lara-López, Maritza A, Liske, Jochen, López-Sánchez, Ángel R, Loveday, Jon, Norberg, Peder, Phillipps, Steven, Popescu, Cristina C, Prescott, Matthew, Sansom, Anne E and Tuffs, Richard J (2014) Galaxy And Mass Assembly (GAMA): stellar mass functions by Hubble type. Monthly Notices of the Royal Astronomical Society, 444 (2). pp. 1647-1659. ISSN 0035-8711

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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=109.0M⊙. We confirm that the galaxy stellar mass function is well described by a double-Schechter function given by M∗=1010.64M⊙, α1 = −0.43, ϕ∗1=4.18dex−1Mpc−3, α2 = −1.50 and ϕ∗2=0.74dex−1Mpc−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 per cent of the stellar mass in the local Universe is found within spheroid-dominated galaxies; ellipticals and S0-Sas. The remaining 29+4−3 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.

Item Type: Article
Schools and Departments: School of Mathematical and Physical Sciences > Physics and Astronomy
Subjects: Q Science > QB Astronomy
Depositing User: Jonathan Loveday
Date Deposited: 24 Jun 2015 15:22
Last Modified: 06 Mar 2017 18:25

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