Journal article
P-MaNGA: GRADIENTS IN RECENT STAR FORMATION HISTORIES AS DIAGNOSTICS FOR GALAXY GROWTH AND DEATH
The Astrophysical journal, Vol.804(2), pp.1-19
05/11/2015
DOI: 10.1088/0004-637X/804/2/125
Abstract
ABSTRACT We present an analysis of the data produced by the MaNGA prototype run (P-MaNGA), aiming to test how the radial gradients in recent star formation histories, as indicated by the 4000 Å break (Dn(4000)), Hδ absorption (EW(HδA)), and H emission (EW(H )) indices, can be useful for understanding disk growth and star formation cessation in local galaxies. We classify 12 galaxies observed on two P-MaNGA plates as either centrally quiescent (CQ) or centrally star-forming (CSF), according to whether Dn(4000) measured in the central spaxel of each datacube exceeds 1.6. For each spaxel we generate both 2D maps and radial profiles of Dn(4000), EW(HδA), and EW(H ). We find that CSF galaxies generally show very weak or no radial variation in these diagnostics. In contrast, CQ galaxies present significant radial gradients, in the sense that Dn(4000) decreases, while both EW(HδA) and EW(H ) increase from the galactic center outward. The outer regions of the galaxies show greater scatter on diagrams relating the three parameters than their central parts. In particular, the clear separation between centrally measured quiescent and star-forming galaxies in these diagnostic planes is largely filled in by the outer parts of galaxies whose global colors place them in the green valley, supporting the idea that the green valley represents a transition between blue-cloud and red-sequence phases, at least in our small sample. These results are consistent with a picture in which the cessation of star formation propagates from the center of a galaxy outward as it moves to the red sequence.
Details
- Title: Subtitle
- P-MaNGA: GRADIENTS IN RECENT STAR FORMATION HISTORIES AS DIAGNOSTICS FOR GALAXY GROWTH AND DEATH
- Creators
- Cheng Li - Max Planck SocietyEnci Wang - Max Planck SocietyLin Lin - Max Planck SocietyMatthew A Bershady - University of Wisconsin–MadisonKevin Bundy - The University of TokyoChristy A Tremonti - University of Wisconsin–MadisonTing Xiao - Max Planck SocietyRenbin Yan - University of KentuckyDmitry Bizyaev - New Mexico State UniversityMichael Blanton - New York UniversitySabrina Cales - Yale UniversityBrian Cherinka - University of TorontoEdmond Cheung - The University of TokyoNiv Drory - University of California, Santa CruzEric Emsellem - Université Claude Bernard Lyon 1Hai Fu - University of IowaJoseph Gelfand - New York University Abu DhabiDavid R Law - University of TorontoLihwai Lin - Institute of Astronomy and Astrophysics, Academia SinicaNick MacDonald - University of WashingtonClaudia Maraston - University of PortsmouthKaren L Masters - University of PortsmouthMichael R Merrifield - University of NottinghamKaike Pan - New Mexico State UniversityS. F Sánchez - Universidad Nacional Autónoma de MéxicoDonald P Schneider - Pennsylvania State UniversityDaniel Thomas - University of PortsmouthDavid Wake - University of Wisconsin–MadisonLixin Wang - Max Planck SocietyAnne-Marie Weijmans - University of St AndrewsDavid Wilkinson - University of PortsmouthPeter Yoachim - University of WashingtonKai Zhang - University of KentuckyTiantian Zheng - New York University Abu Dhabi
- Resource Type
- Journal article
- Publication Details
- The Astrophysical journal, Vol.804(2), pp.1-19
- DOI
- 10.1088/0004-637X/804/2/125
- ISSN
- 0004-637X
- eISSN
- 1538-4357
- Publisher
- The American Astronomical Society
- Number of pages
- 19
- Language
- English
- Date published
- 05/11/2015
- Academic Unit
- Physics and Astronomy
- Record Identifier
- 9984199834902771
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