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Galaxy And Mass Assembly (GAMA): the Stellar Mass Budget by Galaxy Type

Moffett, AJ and Ingarfield, SA and Driver, SP and Robotham, ASG and Kelvin, LS and Lange, R and Mestric, U and Alpaslan, M and Baldry, IK and Bland-Hawthorn, J and Brough, S and Cluver, ME and Davies, LJM and Holwerda, BW and Hopkins, AM and Kafle, PR and Kennedy, R and Norberg, P and Taylor, EN (2016) Galaxy And Mass Assembly (GAMA): the Stellar Mass Budget by Galaxy Type. Monthly Notices of the Royal Astronomical Society, 457 (2). pp. 1308-1319. ISSN 0035-8711

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Abstract

We report an expanded sample of visual morphological classifications from the Galaxy and Mass Assembly (GAMA) survey phase two, which now includes 7,556 objects (previously 3,727 in phase one). We define a local (z <0.06) sample and classify galaxies into E, S0-Sa, SB0-SBa, Sab-Scd, SBab-SBcd, Sd-Irr, and "little blue spheroid" types. Using these updated classifications, we derive stellar mass function fits to individual galaxy populations divided both by morphological class and more general spheroid- or disk-dominated categories with a lower mass limit of log(Mstar/Msun) = 8 (one dex below earlier morphological mass function determinations). We find that all individual morphological classes and the combined spheroid-/bulge-dominated classes are well described by single Schechter stellar mass function forms. We find that the total stellar mass densities for individual galaxy populations and for the entire galaxy population are bounded within our stellar mass limits and derive an estimated total stellar mass density of rho_star = 2.5 x 10^8 Msun Mpc^-3 h_0.7, which corresponds to an approximately 4% fraction of baryons found in stars. The mass contributions to this total stellar mass density by galaxies that are dominated by spheroidal components (E and S0-Sa classes) and by disk components (Sab-Scd and Sd-Irr classes) are approximately 70% and 30%, respectively.

Item Type: Article
Additional Information: This is a pre-copyedited, author-produced PDF of an article accepted for publication in Monthly Notices of the Royal Astronomical Society following peer review. The version of record "Galaxy And Mass Assembly (GAMA): the Stellar Mass Budget by Galaxy Type" is available online at: http://dx.doi.org/10.1093/mnras/stv2883
Uncontrolled Keywords: astro-ph.GA; astro-ph.GA
Subjects: Q Science > QB Astronomy
Divisions: Astrophysics Research Institute
Publisher: Oxford University Press
Related URLs:
Date Deposited: 16 Dec 2015 11:31
Last Modified: 31 Mar 2016 08:49
URI: http://researchonline.ljmu.ac.uk/id/eprint/2482

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