Skip to main content

Research Repository

Advanced Search

Galaxy And Mass Assembly (GAMA): the wavelength-dependent sizes and profiles of galaxies revealed by MegaMorph

Vulcani, Benedetta; Bamford, Steven P.; Häußler, Boris; Vika, Marina; Rojas, Alex L.; Agius, N.K.; Baldry, Ivan; Bauer, A.E.; Browne, William J.I.; Driver, Simon; Graham, Alister W.; Kelvin, Lee S.; Liske, J.; Loveday, J.; Popescu, Cristina C.; Robotham, A.S.G.; Tuffs, Richard J.

Authors

Benedetta Vulcani

Steven P. Bamford

Boris Häußler

Marina Vika

Alex L. Rojas

N.K. Agius

Ivan Baldry

A.E. Bauer

William J.I. Browne

Simon Driver

Alister W. Graham

Lee S. Kelvin

J. Liske

J. Loveday

Cristina C. Popescu

A.S.G. Robotham

Richard J. Tuffs



Abstract

We investigate the relationship between colour and structure within galaxies using a large, volume-limited sample of bright, low-redshift galaxies with optical–near-infrared imaging from the Galaxy And Mass Assembly survey. We fit single-component, wavelength-dependent, elliptical Sérsic models to all passbands simultaneously, using software developed by the MegaMorph project. Dividing our sample by n and colour, the recovered wavelength variations in effective radius (Re) and Sérsic index (n) reveal the internal structure, and hence formation history, of different types of galaxies. All these trends depend on n; some have an additional dependence on galaxy colour. Late-type galaxies (nr 2.5), even though they maintain constant n with wavelength, revealing that ellipticals are a superimposition of different stellar populations associated with multiple collapse and merging events. Processes leading to structures with larger Re must be associated with lower metallicity or younger stellar populations. This appears to rule out the formation of young cores through dissipative gas accretion as an important mechanism in the recent lives of luminous elliptical galaxies.

Journal Article Type Article
Journal Monthly Notices of the Royal Astronomical Society
Print ISSN 0035-8711
Electronic ISSN 1365-2966
Publisher Oxford University Press (OUP)
Peer Reviewed Peer Reviewed
Volume 441
Issue 2
APA6 Citation Vulcani, B., Bamford, S. P., Häußler, B., Vika, M., Rojas, A. L., Agius, N., …Tuffs, R. J. (in press). Galaxy And Mass Assembly (GAMA): the wavelength-dependent sizes and profiles of galaxies revealed by MegaMorph. Monthly Notices of the Royal Astronomical Society, 441(2), doi:10.1093/mnras/stu632
DOI https://doi.org/10.1093/mnras/stu632
Keywords galaxies, formation, structure, fundamental parameters
Publisher URL http://mnras.oxfordjournals.org/content/441/2/1340
Copyright Statement Copyright information regarding this work can be found at the following address: http://eprints.nottingh.../end_user_agreement.pdf

Files

tmp9qvkDh.pdf (7.1 Mb)
PDF

Copyright Statement
Copyright information regarding this work can be found at the following address: http://eprints.nottingham.ac.uk/end_user_agreement.pdf





You might also like



Downloadable Citations

;