Galaxy And Mass Assembly (GAMA): Bulge-disk decomposition of KiDS and VIKING data in the nearby universe
Abstract
Obtaining reliable structural parameters for the different components of galaxies is important for a wide variety of studies of galaxy properties and evolution. I will present our current work on the bulge-disk decomposition of approximately 13000 GAMA galaxies in the nearby universe (z smaller than 0.08) in all 9 optical and near-infrared bands covered by KiDS and VIKING. The galaxy profiling itself uses the 2-dimensional Bayesian profile fitting code ProFit (Robotham et al. 2016) while the preparatory work (image segmentation/source identification, sky subtraction, initial parameter estimates) is carried out using the sister package ProFound (Robotham et al. 2018). The local PSF is estimated using a combination of ProFound and ProFit to identify stars near the galaxy of interest and fit them with a Moffat function. These decompositions will be used to derive the stellar mass functions of bulges and disks and study the nature and distribution of dust in galaxy disks.
- Publication:
-
The Art of Measuring Galaxy Physical Properties
- Pub Date:
- November 2019
- DOI:
- 10.5281/zenodo.3556629
- Bibcode:
- 2019amgp.confE..26C
- Keywords:
-
- galaxies: structure;
- galaxies: fundamental parameters;
- dust;
- extinction;
- catalogues;
- methods: statistical;
- techniques: photometric;
- Zenodo community app-iasfmi-2019