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, Nicola K.; Baldry, Ivan K.; Bauer, Amanda E.; Brown, Michael J. I.; Driver, Simon; Graham, Alister W.; Kelvin, Lee S.; Liske, Jochen; Loveday, Jon; Popescu, Cristina C.; Robotham, Aaron S. G.; Tuffs, Richard J.
Citation: Vulcani , B , Bamford , S P , Häußler , B , Vika , M , Rojas , A L , Agius , N K , Baldry , I K , Bauer , A E , Brown , M J I , Driver , S , Graham , A W , Kelvin , L S , Liske , J , Loveday , J , Popescu , C C , Robotham , A S G & Tuffs , R J 2014 , ' Galaxy and mass assembly (GAMA) : The wavelength-dependent sizes and profiles of galaxies revealed by MegaMorph ' Monthly Notices of the Royal Astronomical Society , vol 441 , no. 2 , stu632 , pp. 1340-1362 . DOI: 10.1093/mnras/stu632
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 AndMass 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) show a dramatic increase in Sérsic index with wavelength. This might be a result of their two-component (bulge-disc) nature, though stellar population gradients within each component and dust attenuation are likely to play a role. All galaxies show a substantial decrease in Re with wavelength. This is strongest for early types (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.
This item appears in the following Collection(s)
Showing items related by title, author, creator and subject.
The H alpha galaxy survey. I. The galaxy sample, H alpha narrow-band observations and star formation parameters for 334 galaxies James, P.A.; Shane, N.S.; Beckman, J.E.; Cardwell, A.; Collins, C.A.; Etherton, J.; de Jong, R.S.; Fathi, K.; Knapen, J.; Peletier, R.F.; Percival, S.M.; Pollacco, D.L.; Seigar, M.S.; Stedman, S. (2004)We discuss the selection and observations of a large sample of nearby galaxies, which we are using to quantify the star formation activity in the local Universe. The sample consists of 334 galaxies across all Hubble types ...
The James Clerk Maxwell Telescope Nearby Galaxies Legacy Survey. II. Warm molecular gas and star formation in three field spiral galaxies Warren, B.E.; Wilson, C.D.; Israel, F.P.; Serjeant, S.; Bendo, G.; Brinks, E.; Clements, D.; Irwin, J.; Knapen, J.; Leech, J.; Matthews, H.; Muhle, S.; Mortimer, A.M.J.; Petitpas, G.; Sinukoff, E.; Spekkens, K.; Tan, B.K.; Tilanus, R.P.J.; Usero, A.; van der Werf, P.; Vlahakis, C.; Wiegert, T.; Zhu, M. (2010)We present the results of large-area 12CO J = 3-2 emission mapping of three nearby field galaxies, NGC 628, NGC 3521, and NGC 3627, completed at the James Clerk Maxwell Telescope as part of the Nearby Galaxies Legacy Survey. ...
Kaufman, M.; Brinks, E.; Elmegreen, B.; Elmegreen, D.M.; Klaric, M.; Struck, C.; Thomasson, M.; Vogel, S. (1999)
Your requested file is now available for download. You may start your download by selecting the following link: test