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Galaxy Decomposition with IFU Data: bulges, discs, and beyond – Evelyn Johnston (ESO, Chile)
September 27, 2017: 12:30 - 13:30
With the availability of large integral-field unit (IFU) spectral surveys of nearby galaxies, there is now the potential to extract spectral information from across the bulges and discs of galaxies in a systematic way. This information can address questions such as how these components built up with time, how galaxies evolve and whether their evolution depends on other properties of the galaxy such as its mass or environment.
In this talk, I will present BUDDI (Bulge-Disc Decomposition of IFU data), a new approach to fit the two-dimensional light profiles of galaxies as a function of wavelength to extract the spectral properties of these galaxies’ discs and bulges. The fitting is carried out using GALFITM, a modified form of GALFIT which can fit multi-waveband images simultaneously. This technique is able to isolate the spectrum of each component independently using knowledge from the whole datacube, leading to clean analysis of the stellar populations and star-formation histories with minimal contamination. This talk will provide an overview of the fitting process and some example stellar population analyses of early-type galaxies from the MaNGA survey to give an indication of the scientific potential of applying bulge-disc decomposition to IFU data. I will then finish with an overview of more recent projects that have pushed BUDDI beyond simply fitting bulges and discs of galaxies.