P-MaNGA: GRADIENTS in RECENT STAR FORMATION HISTORIES AS DIAGNOSTICS for GALAXY GROWTH and DEATH

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

Research output: Contribution to journalArticle

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 Šbreak (D<inf>n</inf>(4000)), Hδ absorption (EW(Hδ<inf>A</inf>)), 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 D<inf>n</inf>(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<inf>n</inf>(4000), EW(Hδ<inf>A</inf>), 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 D<inf>n</inf>(4000) decreases, while both EW(Hδ<inf>A</inf>) 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.

Original languageEnglish (US)
Article number125
JournalAstrophysical Journal
Volume804
Issue number2
DOIs
StatePublished - May 10 2015

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star formation
histories
galaxies
history
valley
diagram
stars
valleys
gradients
diagrams
prototypes
color
profiles
analysis
index
test
parameter

Keywords

  • Galaxies: evolution
  • Galaxies: formation
  • Galaxies: general
  • Galaxies: stellar content
  • Methods: observational
  • Surveys

ASJC Scopus subject areas

  • Space and Planetary Science
  • Astronomy and Astrophysics

Cite this

Li, C., Wang, E., Lin, L., Bershady, M. A., Bundy, K., Tremonti, C. A., ... 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

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 A.; Xiao, Ting; Yan, Renbin; Bizyaev, Dmitry; Blanton, Michael; Cales, Sabrina; Cherinka, Brian; Cheung, Edmond; Drory, Niv; Emsellem, Eric; Fu, Hai; Gelfand, Joseph (Yosi); Law, David R.; Lin, Lihwai; MacDonald, Nick; Maraston, Claudia; Masters, Karen L.; Merrifield, Michael R.; Pan, Kaike; Sánchez, S. F.; Schneider, Donald P.; Thomas, Daniel; Wake, David; Wang, Lixin; Weijmans, Anne Marie; Wilkinson, David; Yoachim, Peter; Zhang, Kai; Zheng, Tiantian.

In: Astrophysical Journal, Vol. 804, No. 2, 125, 10.05.2015.

Research output: Contribution to journalArticle

Li, C, Wang, E, Lin, L, Bershady, MA, Bundy, K, Tremonti, CA, Xiao, T, Yan, R, Bizyaev, D, Blanton, M, Cales, S, Cherinka, B, Cheung, E, Drory, N, Emsellem, E, Fu, H, Gelfand, JY, Law, DR, Lin, L, MacDonald, N, Maraston, C, Masters, KL, Merrifield, MR, Pan, K, Sánchez, SF, Schneider, DP, Thomas, D, Wake, D, Wang, L, Weijmans, AM, Wilkinson, D, Yoachim, P, Zhang, K & Zheng, T 2015, 'P-MaNGA: GRADIENTS in RECENT STAR FORMATION HISTORIES AS DIAGNOSTICS for GALAXY GROWTH and DEATH', Astrophysical Journal, vol. 804, no. 2, 125. https://doi.org/10.1088/0004-637X/804/2/125
Li, Cheng ; Wang, Enci ; Lin, Lin ; Bershady, Matthew A. ; Bundy, Kevin ; Tremonti, Christy A. ; Xiao, Ting ; Yan, Renbin ; Bizyaev, Dmitry ; Blanton, Michael ; Cales, Sabrina ; Cherinka, Brian ; Cheung, Edmond ; Drory, Niv ; Emsellem, Eric ; Fu, Hai ; Gelfand, Joseph (Yosi) ; Law, David R. ; Lin, Lihwai ; MacDonald, Nick ; Maraston, Claudia ; Masters, Karen L. ; Merrifield, Michael R. ; Pan, Kaike ; Sánchez, S. F. ; Schneider, Donald P. ; Thomas, Daniel ; Wake, David ; Wang, Lixin ; Weijmans, Anne Marie ; Wilkinson, David ; Yoachim, Peter ; Zhang, Kai ; Zheng, Tiantian. / P-MaNGA : GRADIENTS in RECENT STAR FORMATION HISTORIES AS DIAGNOSTICS for GALAXY GROWTH and DEATH. In: Astrophysical Journal. 2015 ; Vol. 804, No. 2.
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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 Šbreak (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.",
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AU - Wang, Enci

AU - Lin, Lin

AU - Bershady, Matthew A.

AU - Bundy, Kevin

AU - Tremonti, Christy A.

AU - Xiao, Ting

AU - Yan, Renbin

AU - Bizyaev, Dmitry

AU - Blanton, Michael

AU - Cales, Sabrina

AU - Cherinka, Brian

AU - Cheung, Edmond

AU - Drory, Niv

AU - Emsellem, Eric

AU - Fu, Hai

AU - Gelfand, Joseph (Yosi)

AU - Law, David R.

AU - Lin, Lihwai

AU - MacDonald, Nick

AU - Maraston, Claudia

AU - Masters, Karen L.

AU - Merrifield, Michael R.

AU - Pan, Kaike

AU - Sánchez, S. F.

AU - Schneider, Donald P.

AU - Thomas, Daniel

AU - Wake, David

AU - Wang, Lixin

AU - Weijmans, Anne Marie

AU - Wilkinson, David

AU - Yoachim, Peter

AU - Zhang, Kai

AU - Zheng, Tiantian

PY - 2015/5/10

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N2 - 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 Šbreak (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.

AB - 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 Šbreak (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.

KW - Galaxies: evolution

KW - Galaxies: formation

KW - Galaxies: general

KW - Galaxies: stellar content

KW - Methods: observational

KW - Surveys

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