SDSS-IV MaNGA: Bulge-disc decomposition of IFU data cubes (BUDDI)

Evelyn J. Johnston, Boris Häußler, Alfonso Aragón-Salamanca, Michael R. Merrifield, Steven Bamford, Matthew A. Bershady, Kevin Bundy, Niv Drory, Hai Fu, David Law, Christian Nitschelm, Daniel Thomas, Alexandre Roman Lopes, David Wake, Renbin Yan

Research output: Contribution to journalArticlepeer-review

36 Scopus citations


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, howgalaxies evolve and whether their evolution depends on other properties of the galaxy such as its mass or environment. We present bulge-disc decomposition of IFU data cubes (BUDDI), 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 multiwaveband images simultaneously. The benefit of this technique over traditional multiwaveband fits is that the stellar populations of each component can be constrained using knowledge over the whole image and spectrum available. The decomposition has been developed using commissioning data from the Sloan Digital Sky Survey-IV Mapping Nearby Galaxies atAPO(MaNGA)survey with redshifts z < 0.14 and coverage of at least 1.5 effective radii for a spatial resolution of 2.5 arcsec full width at half-maximum and field of view of > 22 arcsec, but can be applied to any IFU data of a nearby galaxy with similar or better spatial resolution and coverage. We present an overview of the fitting process, the results from our tests, and we finish with example stellar population analyses of early-type galaxies from theMaNGA survey to give an indication of the scientific potential of applying bulge-disc decomposition to IFU data.

Original languageEnglish
Pages (from-to)2317-2341
Number of pages25
JournalMonthly Notices of the Royal Astronomical Society
Issue number2
StatePublished - Feb 21 2017

Bibliographical note

Funding Information:
We would like to thank Vladimir Avila-Reese for useful discussions about the technique and future applications of the technique presented in this paper. We would also like to thank the anonymous referee for their useful comments that helped improve this paper. EJJ acknowledges support from the Marie Curie Actions of the European Commission (FP7-COFUND) and the Science and Technology Facilities Council (STFC). KB acknowledges support from the World Premier International Research Center Initiative (WPI Initiative), MEXT, Japan and by JSPS KAKENHI Grant no. 15K17603. MAB acknowledges support from NSF AST-1517006. Funding for the SDSS-IV has been provided by the Alfred P. Sloan Foundation, the US Department of Energy Office of Science, and the Participating Institutions. SDSS-IV acknowledges support and resources from the Center for High-Performance Computing at the University of Utah. The SDSS website is SDSS-IV is managed by the Astrophysical Research Consortium for the Participating Institutions of the SDSS Collaboration including the Brazilian Participation Group, the Carnegie Institution for Science, Carnegie Mellon University, the Chilean Participation Group, the French Participation Group, Harvard-Smithsonian Center for Astrophysics, Instituto de Astrofísica de Canarias, The Johns Hopkins University, Kavli Institute for the Physics and Mathematics of the Universe (IPMU)/University of Tokyo, Lawrence Berkeley National Laboratory, Leibniz Institut für Astrophysik Potsdam (AIP), Max-Planck-Institut für Astronomie (MPIA Heidelberg), Max-Planck-Institut für Astrophysik (MPA Garching), Max-Planck-Institut für Extraterrestrische Physik (MPE), National Astronomical Observatory of China, New Mexico State University, New York University, University of Notre Dame, Observatário Nacional/MCTI, The Ohio State University, Pennsylvania State University, Shanghai Astronomical Observatory, United Kingdom Participation Group, Universidad Nacional Autónoma de México, University of Arizona, University of Colorado Boulder, University of Oxford, University of Portsmouth, University of Utah, University ofVirginia, University ofWashington, University ofWisconsin, Vanderbilt University, and Yale University. This research made use of Montage. It is funded by the National Science Foundation under Grant Number ACI-1440620, and was previously funded by the National Aeronautics and Space Administration's Earth Science Technology Office, Computation Technologies Project, under Cooperative Agreement Number NCC5-626 between NASA and the California Institute of Technology.

Publisher Copyright:
© 2016 The Authors.


  • Galaxies: bulges
  • Galaxies: evolution
  • Galaxies: formation
  • Galaxies: stellar content
  • Galaxies: structure

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science


Dive into the research topics of 'SDSS-IV MaNGA: Bulge-disc decomposition of IFU data cubes (BUDDI)'. Together they form a unique fingerprint.

Cite this