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 MacDonald & 14 others Claudia 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

    Fingerprint

    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.",
    keywords = "Galaxies: evolution, Galaxies: formation, Galaxies: general, Galaxies: stellar content, Methods: observational, Surveys",
    author = "Cheng Li and Enci Wang and Lin Lin and Bershady, {Matthew A.} and Kevin Bundy and Tremonti, {Christy A.} and Ting Xiao and Renbin Yan and Dmitry Bizyaev and Michael Blanton and Sabrina Cales and Brian Cherinka and Edmond Cheung and Niv Drory and Eric Emsellem and Hai Fu and Gelfand, {Joseph (Yosi)} and Law, {David R.} and Lihwai Lin and Nick MacDonald and Claudia Maraston and Masters, {Karen L.} and Merrifield, {Michael R.} and Kaike Pan and S{\'a}nchez, {S. F.} and Schneider, {Donald P.} and Daniel Thomas and David Wake and Lixin Wang and Weijmans, {Anne Marie} and David Wilkinson and Peter Yoachim and Kai Zhang and Tiantian Zheng",
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    T2 - GRADIENTS in RECENT STAR FORMATION HISTORIES AS DIAGNOSTICS for GALAXY GROWTH and DEATH

    AU - Li, Cheng

    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

    Y1 - 2015/5/10

    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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    U2 - 10.1088/0004-637X/804/2/125

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    JO - Astrophysical Journal

    JF - Astrophysical Journal

    SN - 0004-637X

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