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Title: P-MaNGA: GRADIENTS IN RECENT STAR FORMATION HISTORIES AS DIAGNOSTICS FOR GALAXY GROWTH AND DEATH

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 (D{sub n}(4000)), Hδ absorption (EW(Hδ{sub A})), and Hα emission (EW(Hα)) 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 D{sub n}(4000) measured in the central spaxel of each datacube exceeds 1.6. For each spaxel we generate both 2D maps and radial profiles of D{sub n}(4000), EW(Hδ{sub A}), and EW(Hα). 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 D{sub n}(4000) decreases, while both EW(Hδ{sub A}) and EW(Hα) 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 placemore » 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.« less

Authors:
; ; ;  [1]; ;  [2]; ;  [3];  [4];  [5]; ;  [6];  [7]; ;  [8];  [9];  [10];  [11];  [12];  [13] more »; « less
  1. Partner Group of Max-Planck Institute for Astrophysics, Shanghai Astronomical Observatory, Nandan Road 80, Shanghai 200030 (China)
  2. Department of Astronomy, University of Wisconsin–Madison, Madison, WI 53706 (United States)
  3. Kavli Institute for the Physics and Mathematics of the universe (Kavli IPMU, WPI), Todai Institutes for Advanced Study, the University of Tokyo, Kashiwa 277-8583 (Japan)
  4. Department of Physics and Astronomy, University of Kentucky, Lexington, KY 40506 (United States)
  5. Apache Point Observatory and New Mexico State University, P.O. Box 59, Sunspot, NM, 88349-0059 (United States)
  6. Center for Cosmology and Particle Physics, Department of Physics, New York University, 4 Washington Place, New York, NY 10003 (United States)
  7. Yale Center for Astronomy and Astrophysics, Physics Department, Yale University, P.O. Box 208120, New Haven, CT 06520-8120 (United States)
  8. Dunlap Institute for Astronomy and Astrophysics, University of Toronto, 50 St. George Street, Toronto, ON M5S 3H4 (Canada)
  9. Department of Astronomy and Astrophysics, University of California, Santa Cruz, CA 95064 (United States)
  10. European Southern Observatory, Karl-Schwarzschild-Strasse 2, D-85748 Garching (Germany)
  11. Department of Physics and Astronomy, University of Iowa, Iowa City, IA 52242 (United States)
  12. Institute of Astronomy and Astrophysics, Academia Sinica, Taipei 106, Taiwan (China)
  13. Department of Astronomy, Box 351580, University of Washington, Seattle, WA 98195 (United States)
Publication Date:
OSTI Identifier:
22522442
Resource Type:
Journal Article
Journal Name:
Astrophysical Journal
Additional Journal Information:
Journal Volume: 804; Journal Issue: 2; Other Information: Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 0004-637X
Country of Publication:
United States
Language:
English
Subject:
79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; ABSORPTION SPECTRA; CLOUDS; COLOR; GALACTIC EVOLUTION; INDEXES; MILKY WAY; STAR EVOLUTION; STARS; VARIATIONS

Citation Formats

Li, Cheng, Wang, Enci, Lin, Lin, Xiao, Ting, Bershady, Matthew A., Tremonti, Christy A., Bundy, Kevin, Cheung, Edmond, Yan, Renbin, Bizyaev, Dmitry, Blanton, Michael, Gelfand, Joseph, Cales, Sabrina, Cherinka, Brian, Law, David R., Drory, Niv, Emsellem, Eric, Fu, Hai, Lin, Lihwai, MacDonald, Nick, E-mail: leech@shao.ac.cn, and and others. P-MaNGA: GRADIENTS IN RECENT STAR FORMATION HISTORIES AS DIAGNOSTICS FOR GALAXY GROWTH AND DEATH. United States: N. p., 2015. Web. doi:10.1088/0004-637X/804/2/125.
Li, Cheng, Wang, Enci, Lin, Lin, Xiao, Ting, Bershady, Matthew A., Tremonti, Christy A., Bundy, Kevin, Cheung, Edmond, Yan, Renbin, Bizyaev, Dmitry, Blanton, Michael, Gelfand, Joseph, Cales, Sabrina, Cherinka, Brian, Law, David R., Drory, Niv, Emsellem, Eric, Fu, Hai, Lin, Lihwai, MacDonald, Nick, E-mail: leech@shao.ac.cn, & and others. P-MaNGA: GRADIENTS IN RECENT STAR FORMATION HISTORIES AS DIAGNOSTICS FOR GALAXY GROWTH AND DEATH. United States. doi:10.1088/0004-637X/804/2/125.
Li, Cheng, Wang, Enci, Lin, Lin, Xiao, Ting, Bershady, Matthew A., Tremonti, Christy A., Bundy, Kevin, Cheung, Edmond, Yan, Renbin, Bizyaev, Dmitry, Blanton, Michael, Gelfand, Joseph, Cales, Sabrina, Cherinka, Brian, Law, David R., Drory, Niv, Emsellem, Eric, Fu, Hai, Lin, Lihwai, MacDonald, Nick, E-mail: leech@shao.ac.cn, and and others. Sun . "P-MaNGA: GRADIENTS IN RECENT STAR FORMATION HISTORIES AS DIAGNOSTICS FOR GALAXY GROWTH AND DEATH". United States. doi:10.1088/0004-637X/804/2/125.
@article{osti_22522442,
title = {P-MaNGA: GRADIENTS IN RECENT STAR FORMATION HISTORIES AS DIAGNOSTICS FOR GALAXY GROWTH AND DEATH},
author = {Li, Cheng and Wang, Enci and Lin, Lin and Xiao, Ting and Bershady, Matthew A. and Tremonti, Christy A. and Bundy, Kevin and Cheung, Edmond and Yan, Renbin and Bizyaev, Dmitry and Blanton, Michael and Gelfand, Joseph and Cales, Sabrina and Cherinka, Brian and Law, David R. and Drory, Niv and Emsellem, Eric and Fu, Hai and Lin, Lihwai and MacDonald, Nick, E-mail: leech@shao.ac.cn and and others},
abstractNote = {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 (D{sub n}(4000)), Hδ absorption (EW(Hδ{sub A})), and Hα emission (EW(Hα)) 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 D{sub n}(4000) measured in the central spaxel of each datacube exceeds 1.6. For each spaxel we generate both 2D maps and radial profiles of D{sub n}(4000), EW(Hδ{sub A}), and EW(Hα). 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 D{sub n}(4000) decreases, while both EW(Hδ{sub A}) and EW(Hα) 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.},
doi = {10.1088/0004-637X/804/2/125},
journal = {Astrophysical Journal},
issn = {0004-637X},
number = 2,
volume = 804,
place = {United States},
year = {2015},
month = {5}
}