Galaxy And Mass Assembly (GAMA) : the stellar mass budget by galaxy type.

Authors

Amanda J. Moffett, University of Western Australia
Stephen A. Ingarfield, University of Western Australia
Simon P. Driver, University of Western Australia
Aaron S. G. Robotham, University of Western Australia
Lee S. Kelvin, Universitat Innsbruck
Rebecca Lange, University of Western Australia
Uros Mestric, Universitat Innsbruck
Mehmet Alpaslan, NASA Ames Research Center
Ivan K. Baldry, Liverpool John Moores University
Joss Bland-Hawthorn, University of Sydney
Sarah Brough, Australian Astronomical Observatory
Michelle Cluver, University of Western Cape
Luke J. M. Davies, University of Western Australia
Benne W. Holwerda, University of Louisville
Andrew M. Hopkins, Australian Astronomical Observatory
Prajwal R. Kafle, University of Western Australia
Rebecca Kennedy, University of Nottingham
Peder Norberg, Durham University
Edward N. Taylor, University of Melbourne

Document Type

Article

Publication Date

4-2016

Department

Physics and Astronomy

Abstract

We report an expanded sample of visual morphological classifications from the Galaxy and Mass Assembly survey phase two, which now includes 7556 objects (previously 3727 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 disc-dominated categories with a lower mass limit of log(M*/M⊙) = 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 ρ* = 2.5 × 108 M⊙ Mpc−3 h0.7, which corresponds to an approximately 4 per cent 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 disc components (Sab-Scd and Sd-Irr classes) are approximately 70 and 30 per cent, respectively.

Comments

This article has been accepted for publication in Monthly Notices of the Royal Astronomical Society Copyright: 2016. Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved.

https://doi.org/10.1093/mnras/stv2883

Original Publication Information

Moffett, Amanda J., et al. "Galaxy And Mass Assembly (GAMA): The Stellar Mass Budget By Galaxy Type." 2016. Monthly Notices of the Royal Astronomical Society 457(2): 1308-1319.

ThinkIR Citation

Moffett, Amanda J.; Ingarfield, Stephen A.; Driver, Simon P.; Robotham, Aaron S. G.; Kelvin, Lee S.; Lange, Rebecca; Mestric, Uros; Alpaslan, Mehmet; Baldry, Ivan K.; Bland-Hawthorn, Joss; Brough, Sarah; Cluver, Michelle; Davies, Luke J. M.; Holwerda, Benne W.; Hopkins, Andrew M.; Kafle, Prajwal R.; Kennedy, Rebecca; Norberg, Peder; and Taylor, Edward N., "Galaxy And Mass Assembly (GAMA) : the stellar mass budget by galaxy type." (2016). Faculty and Staff Scholarship. 198.
https://ir.library.louisville.edu/faculty/198

DOI

10.1093/mnras/stv2883