Galaxy and Mass Assembly (GAMA) : the stellar mass budget of galaxy spheroids and discs.

Authors

Amanda J. Moffett, University of Western Australia
Rebecca Lange, University of Western Australia
Simon P. Driver, University of Western Australia
Aaron S. G. Robotham, University of Western Australia
Lee S. Kelvin, Liverpool John Moores University
Mehmet Alpaslan, NASA Ames Research Center
Stephen K. Andrews, University of Western Australia
Joss Bland-Hawthorn, University of Sydney
Sarah Brough, Australian Astronomical Observatory
Michelle E. Cluver, University of Western Cape
Matthew Colless, Australian National University
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
Jochen Liske, Universitat Hamburg
Martin Meyer, University of Western Australia

Document Type

Article

Publication Date

11-2016

Department

Physics and Astronomy

Abstract

We build on a recent photometric decomposition analysis of 7506 Galaxy and Mass Assembly (GAMA) survey galaxies to derive stellar mass function fits to individual spheroid and disc component populations down to a lower mass limit of log(M*/M⊙) = 8. We find that the spheroid/disc mass distributions for individual galaxy morphological types are well described by single Schechter function forms. We derive estimates of the total stellar mass densities in spheroids (ρspheroid = 1.24 ± 0.49 × 108 M⊙ Mpc −3h0.7) and discs (ρdisc = 1.20 ± 0.45 × 108 M⊙ Mpc −3h0.7), which translates to approximately 50 per cent of the local stellar mass density in spheroids and 48 per cent in discs. The remaining stellar mass is found in the dwarf ‘little blue spheroid’ class, which is not obviously similar in structure to either classical spheroid or disc populations. We also examine the variation of component mass ratios across galaxy mass and group halo mass regimes, finding the transition from spheroid to disc mass dominance occurs near galaxy stellar mass ∼1011 M⊙ and group halo mass ∼1012.5 M⊙h−1. We further quantify the variation in spheroid-to-total mass ratio with group halo mass for central and satellite populations as well as the radial variation of this ratio within groups.

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/stw1861

Original Publication Information

Moffett, Amanda J., et al. "Galaxy and Mass Assembly (GAMA): The Stellar Mass Budget of Galaxy Spheroids and Discs." 2016. Monthly Notices of the Royal Astronomical Society 462(4): 4336-4348.

ThinkIR Citation

Moffett, Amanda J.; Lange, Rebecca; Driver, Simon P.; Robotham, Aaron S. G.; Kelvin, Lee S.; Alpaslan, Mehmet; Andrews, Stephen K.; Bland-Hawthorn, Joss; Brough, Sarah; Cluver, Michelle E.; Colless, Matthew; Davies, Luke J. M.; Holwerda, Benne W.; Hopkins, Andrew M.; Kafle, Prajwal R.; Liske, Jochen; and Meyer, Martin, "Galaxy and Mass Assembly (GAMA) : the stellar mass budget of galaxy spheroids and discs." (2016). Faculty and Staff Scholarship. 156.
https://ir.library.louisville.edu/faculty/156

DOI

10.1093/mnras/stw1861