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P-MaNGA: gradients in recent star formation histories as diagnostics for galaxy growth and death

Li, Cheng; Wang, Enci; Lin, Lin; Bershady, Matthew A.; Bundy, Kevin; Tremonti, Christy; Xiao, Ting; Yan, Renbin; Bizyaev, Dmitry; Blanton, Michael R.; Cales, Sabrina; Cherinka, Brian; Cheung, Edmond; Drory, Niv; Emsellem, Eric; Fu, Hai; Gelfland, Joseph; Law, David R.; Lin, Lihwai; MacDonald, Nick; Maraston, Claudia; Masters, Karen; Merrifield, Michael R.; Pan, Kaike; Sanchez, Sebastian F.; Schneider, Donald P.; Thomas, Daniel; Wake, David A.; Wang, Lixin; Weijmans, Anne-Marie; Wilkinson, David; Yoachim, Peter; Zhang, Kai; Zheng, Tiantian

Authors

Cheng Li

Enci Wang

Lin Lin

Matthew A. Bershady

Kevin Bundy

Christy Tremonti

Ting Xiao

Renbin Yan

Dmitry Bizyaev

Michael R. Blanton

Sabrina Cales

Brian Cherinka

Edmond Cheung

Niv Drory

Eric Emsellem

Hai Fu

Joseph Gelfland

David R. Law

Lihwai Lin

Nick MacDonald

Claudia Maraston

Karen Masters

Kaike Pan

Sebastian F. Sanchez

Donald P. Schneider

Daniel Thomas

David A. Wake

Lixin Wang

Anne-Marie Weijmans

David Wilkinson

Peter Yoachim

Kai Zhang

Tiantian Zheng



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 ??break (Dn(4000)), H? absorption (EW(H?A)), 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(H?A), 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(H?A) 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.

Journal Article Type Article
Publication Date May 11, 2015
Journal The Astrophysical Journal
Print ISSN 0004-637X
Electronic ISSN 1538-4357
Publisher American Astronomical Society
Peer Reviewed Peer Reviewed
Volume 804
Issue 2
Article Number 125
Pages 125
APA6 Citation Li, C., Wang, E., Lin, L., Bershady, M. A., Bundy, K., Tremonti, C., …Zheng, T. (2015). P-MaNGA: gradients in recent star formation histories as diagnostics for galaxy growth and death. Astrophysical Journal, 804(2), 125. https://doi.org/10.1088/0004-637x/804/2/125
DOI https://doi.org/10.1088/0004-637x/804/2/125
Keywords Galaxies: evolution, Galaxies: formation, Galaxies: general, Galaxies: stellar content, Methods: observational, Surveys
Publisher URL http://iopscience.iop.org/article/10.1088/0004-637X/804/2/125/meta
Copyright Statement Copyright information regarding this work can be found at the following address: http://eprints.nottingh.../end_user_agreement.pdf
Additional Information Copyright 2015 The American Astronomical Society

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Copyright Statement
Copyright information regarding this work can be found at the following address: http://eprints.nottingham.ac.uk/end_user_agreement.pdf





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