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With the availability of large integral-field unit (IFU) spectral surveys ofnearby galaxies, there is now the potential to extract spectral informationfrom across the bulges and discs of galaxies in a systematic way. Thisinformation can address questions such as how these components built up withtime, how galaxies evolve and whether their evolution depends on otherproperties of the galaxy such as its mass or environment. We present BUDDI, anew approach to fit the two-dimensional light profiles of galaxies as afunction of wavelength to extract the spectral properties of these galaxies'discs and bulges. The fitting is carried out using GalfitM, a modified form ofGalfit which can fit multi-waveband images simultaneously. The benefit of thistechnique over traditional multi-waveband fits is that the stellar populationsof each component can be constrained using knowledge over the whole image andspectrum available. The decomposition has been developed using commissioningdata from the SDSS-IV Mapping Nearby Galaxies at APO (MaNGA) survey withredshifts z<0.14 and coverage of at least 1.5 effective radii for a spatialresolution of 2.5 arcsec FWHM and field of view of >22 arcsec, but can beapplied to any IFU data of a nearby galaxy with similar or better spatialresolution and coverage. We present an overview of the fitting process, theresults from our tests, and we finish with example stellar population analysesof early-type galaxies from the MaNGA survey to give an indication of thescientific potential of applying bulge-disc decomposition to IFU data.

SDSS-IV MaNGA: Bulge-Disc Decomposition of IFU Datacubes (BUDDI)