Measuring the growth history of galaxy outskirts

• Project/Area Number: 15K17603
• Research Category: Grant-in-Aid for Young Scientists (B)
• Allocation Type: Multi-year Fund
• Research Field: Astronomy
• Research Institution: The University of Tokyo
• Principal Investigator: Bundy Kevin Allen 東京大学, カブリ数物連携宇宙研究機構, 特任助教 (20624141)
• Project Period (FY): 2015-04-01 – 2017-03-31
• Project Status: Completed (Fiscal Year 2016)
• Budget Amount: ¥3,900,000 (Direct Cost: ¥3,000,000、Indirect Cost: ¥900,000); Fiscal Year 2016: ¥1,950,000 (Direct Cost: ¥1,500,000、Indirect Cost: ¥450,000); Fiscal Year 2015: ¥1,950,000 (Direct Cost: ¥1,500,000、Indirect Cost: ¥450,000)
• Keywords: Spectral fitting / Stellar Gradients / AGN winds / Feedback / Population Gradients / AGN-driven winds / Suppress Star Formation / Maintenance Feedback

Outline of Final Research Achievements

The purpose of this project was to test the 2-phase formation scenario for elliptical galaxies which states that their central cores are formed early while their outskirts build up through the accretion of "foreign stars" with time. Using the FIREFLY code, we have begun spectral fitting to determine stellar population properties.During this process, an important discovery was made of a new class of galaxy we call　Red Geysers. These "red geysers" host unexpected AGN winds and may be a critical　reason why star formation remains suppressed in these systems at late times. The　resulting paper was published in Nature.　Additionally, we returned to the primary analysis of the stellar populations and investigated their dependence on the local environment in which the galaxy lives.
Finally a workshop was held to deeply discuss and compare different approaches for　measuring stellar properties from the observed spectra. This workshop was highly successful and will result in improved methods.

Research Products

• [Int'l Joint Research] Harvard University/University of Wisconsin/Johns Hopkins University(米国)
• [Int'l Joint Research] University of Portsmouth/University of Oxford/University of Cambridge(英国)
• [Int'l Joint Research] Max-Planck-Institut fur Astronomie/Max-Planck-Institut fur Astrophysik/MPE(ドイツ)
• [Int'l Joint Research] National Astronomical Observatories/Shanghai Astronomical Observatory/Shanghai Jiao Tong University(China)
• [Int'l Joint Research] Instituto de Astrofisica de Canarias(Spain)
• [Int'l Joint Research]
• [Int'l Joint Research] University of Portsmouth/University of Oxford(英国)
• [Int'l Joint Research] University of Kentucky/Harvard University/Princeton University(米国)
• [Journal Article] SUPPRESSING STAR FORMATION IN QUIESCENT GALAXIES WITH SUPERMASSIVE BLACK HOLE WINDS (2016)
  • Author(s): Cheung, E., Bundy, K. (2nd author of 25 authors) et. al
  • Journal Title: Nature Volume: 533 Issue: 7604 Pages: 504-504
  • DOI: 10.1038/nature18006
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] SDSS-IV MaNGA: Faint quenched galaxies I- Sample selection and evidence for environmental quenching (2016)
  • Author(s): Penny, SJ., Bundy, K. (6th author of 24 authors) et. al.,
  • Journal Title: MNRAS Volume: 462 Issue: 4 Pages: 3955-3978
  • DOI: 10.1093/mnras/stw1913
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] SDSS IV MaNGA - Spatially resolved diagnostic diagrams: A proof that many galaxies are LIERs (2016)
  • Author(s): Belfiore, F., Bundy, K. (11th author of 20 authos) et al.,
  • Journal Title: MNRAS Volume: 461 Issue: 3 Pages: 3111-3111
  • DOI: 10.1093/mnras/stw1234
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] SUPPRESSING STAR FORMATION IN QUIESCENT GALAXIES WITH SUPERMASSIVE BLACK HOLE WINDS (2016)
  • Author(s): Cheung, Edmond; Bundy, Kevin; Cappellari, Michele; Peirani, Sébastien; Rujopakarn, Wiphu; Westfall, Kyle; Yan, Renbin; Bershady, Matthew; Greene, Jenny E.; Heckman, Timothy M.; Drory, Niv; Law, David R.; Masters, Karen L.; Thomas, Daniel; Wake, David A.; Weijmans, AnneMarie; Rubin, Kate; et al.
  • Journal Title: Nature Volume: -
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] SDSS-IV/MaNGA: Spectrophotometric Calibration Technique (2016)
  • Author(s): Renbin Yan, Christy Tremonti, Matthew A. Bershady, David R. Law, David J. Schlegel, Kevin Bundy, Niv Drory, Nicholas MacDonald, Dmitry Bizyaev, Guillermo A. Blanc, Michael R. Blanton, Brian Cherinka, Arthur Eigenbrot, James E. Gunn, Paul Harding, David W. Hogg, Jose R. Sanchez-Gallego, Sebastian F. Sanchez, et al.
  • Journal Title: The Astronomical Journal Volume: 151-1 Issue: 1 Pages: 8-8
  • DOI: 10.3847/0004-6256/151/1/8
  • Peer Reviewed / Int'l Joint Research
• [Presentation] SDSS-IV MaNGA: Mapping Nearby Galaxies at APO (2016)
  • Author(s): Kevin Bundy
  • Organizer: 227th AAS Meeting
  • Place of Presentation: The Gaylord Palms Resort & Convention Center in Kissimmee, Florida, USA
  • Year and Date: 2016-01-04
  • Int'l Joint Research / Invited
• [Presentation] Early Results from the MaNGA Survey (2016)
  • Author(s): Kevin Bundy
  • Organizer: SDSS Collaboration Meeting
  • Place of Presentation: Shannon Hall, Madison, USA
  • Int'l Joint Research / Invited
• [Presentation] Mass Assembly Through Cosmic Time (2016)
  • Author(s): Kevin Bundy
  • Organizer: The Interplay between Local and Global Processes in Galaxies
  • Place of Presentation: Cozumel, Mexico
  • Int'l Joint Research / Invited
• [Presentation] MaNGA in Madrid: What's hot? What's Cookin? (2015)
  • Author(s): Kevin Bundy
  • Organizer: SDSS-Ⅳ Collaboration Meeting
  • Place of Presentation: Instituto de fisica teorica, Madrid, Spain
  • Year and Date: 2015-07-20
  • Int'l Joint Research / Invited
• [Funded Workshop] Spectral Fitting and MaNGA Workshop (2016)
  • Place of Presentation: Kavli IPMU, Chiba, Kashiwa
  • Year and Date: 2016-07-11