Galaxy And Mass Assembly (GAMA): galaxy colour gradients versus colour, structure, and luminosity
Using single-component fits to SDSS/UKIDSS images of galaxies in the G09 region of the GAMA survey we study radial colour gradients across the galaxy population. We use the multi-wavelength information provided by MegaMorph analysis of galaxy light profiles to calculate intrinsic colour gradients, a...
| Main Authors: | , , , , , , , |
|---|---|
| Format: | Article |
| Published: |
EDP Sciences
2016
|
| Subjects: | |
| Online Access: | https://eprints.nottingham.ac.uk/39621/ |
| _version_ | 1848795876978327552 |
|---|---|
| author | Kennedy, Rebecca Bamford, Steven P. Häußler, Boris Brough, Sarah Holwerda, Benne Hopkins, Andrew M. Vika, Marina Vulcani, Benedetta |
| author_facet | Kennedy, Rebecca Bamford, Steven P. Häußler, Boris Brough, Sarah Holwerda, Benne Hopkins, Andrew M. Vika, Marina Vulcani, Benedetta |
| author_sort | Kennedy, Rebecca |
| building | Nottingham Research Data Repository |
| collection | Online Access |
| description | Using single-component fits to SDSS/UKIDSS images of galaxies in the G09 region of the GAMA survey we study radial colour gradients across the galaxy population. We use the multi-wavelength information provided by MegaMorph analysis of galaxy light profiles to calculate intrinsic colour gradients, and divide into six subsamples split by overall Sérsic index (n) and galaxy colour. We find a bimodality in the colour gradients of high- and low-n galaxies in all wavebands which varies with overall galaxy luminosity. Global trends in colour gradients therefore result from combining the contrasting behaviour of a number of different galaxy populations. The ubiquity of strong negative colour gradients supports the picture of inside-out growth through gas accretion for blue, low-n galaxies, and through dry minor mergers for red, high-n galaxies. An exception is the blue high-n population which has properties indicative of dissipative major mergers. |
| first_indexed | 2025-11-14T19:39:04Z |
| format | Article |
| id | nottingham-39621 |
| institution | University of Nottingham Malaysia Campus |
| institution_category | Local University |
| last_indexed | 2025-11-14T19:39:04Z |
| publishDate | 2016 |
| publisher | EDP Sciences |
| recordtype | eprints |
| repository_type | Digital Repository |
| spelling | nottingham-396212020-05-04T18:04:25Z https://eprints.nottingham.ac.uk/39621/ Galaxy And Mass Assembly (GAMA): galaxy colour gradients versus colour, structure, and luminosity Kennedy, Rebecca Bamford, Steven P. Häußler, Boris Brough, Sarah Holwerda, Benne Hopkins, Andrew M. Vika, Marina Vulcani, Benedetta Using single-component fits to SDSS/UKIDSS images of galaxies in the G09 region of the GAMA survey we study radial colour gradients across the galaxy population. We use the multi-wavelength information provided by MegaMorph analysis of galaxy light profiles to calculate intrinsic colour gradients, and divide into six subsamples split by overall Sérsic index (n) and galaxy colour. We find a bimodality in the colour gradients of high- and low-n galaxies in all wavebands which varies with overall galaxy luminosity. Global trends in colour gradients therefore result from combining the contrasting behaviour of a number of different galaxy populations. The ubiquity of strong negative colour gradients supports the picture of inside-out growth through gas accretion for blue, low-n galaxies, and through dry minor mergers for red, high-n galaxies. An exception is the blue high-n population which has properties indicative of dissipative major mergers. EDP Sciences 2016-09-01 Article PeerReviewed Kennedy, Rebecca, Bamford, Steven P., Häußler, Boris, Brough, Sarah, Holwerda, Benne, Hopkins, Andrew M., Vika, Marina and Vulcani, Benedetta (2016) Galaxy And Mass Assembly (GAMA): galaxy colour gradients versus colour, structure, and luminosity. Astronomy & Astrophysics, 593 . A84/1-A84/4. ISSN 0004-6361 galaxies: general ; galaxies: structure ; galaxies: fundamental parameters ; galaxies: formation http://www.aanda.org/articles/aa/abs/2016/09/aa28715-16/aa28715-16.html doi:10.1051/0004-6361/201628715 doi:10.1051/0004-6361/201628715 |
| spellingShingle | galaxies: general ; galaxies: structure ; galaxies: fundamental parameters ; galaxies: formation Kennedy, Rebecca Bamford, Steven P. Häußler, Boris Brough, Sarah Holwerda, Benne Hopkins, Andrew M. Vika, Marina Vulcani, Benedetta Galaxy And Mass Assembly (GAMA): galaxy colour gradients versus colour, structure, and luminosity |
| title | Galaxy And Mass Assembly (GAMA): galaxy colour gradients versus colour, structure, and luminosity |
| title_full | Galaxy And Mass Assembly (GAMA): galaxy colour gradients versus colour, structure, and luminosity |
| title_fullStr | Galaxy And Mass Assembly (GAMA): galaxy colour gradients versus colour, structure, and luminosity |
| title_full_unstemmed | Galaxy And Mass Assembly (GAMA): galaxy colour gradients versus colour, structure, and luminosity |
| title_short | Galaxy And Mass Assembly (GAMA): galaxy colour gradients versus colour, structure, and luminosity |
| title_sort | galaxy and mass assembly (gama): galaxy colour gradients versus colour, structure, and luminosity |
| topic | galaxies: general ; galaxies: structure ; galaxies: fundamental parameters ; galaxies: formation |
| url | https://eprints.nottingham.ac.uk/39621/ https://eprints.nottingham.ac.uk/39621/ https://eprints.nottingham.ac.uk/39621/ |