P-MaNGA: gradients in recent star formation histories as diagnostics for galaxy growth and death
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 g...
| Main Authors: | , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , |
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| Format: | Article |
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American Astronomical Society
2015
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| Online Access: | https://eprints.nottingham.ac.uk/36387/ |
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| author | 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 |
| author_facet | 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 |
| author_sort | Li, Cheng |
| building | Nottingham Research Data Repository |
| collection | Online Access |
| description | 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. |
| first_indexed | 2025-11-14T19:29:33Z |
| format | Article |
| id | nottingham-36387 |
| institution | University of Nottingham Malaysia Campus |
| institution_category | Local University |
| last_indexed | 2025-11-14T19:29:33Z |
| publishDate | 2015 |
| publisher | American Astronomical Society |
| recordtype | eprints |
| repository_type | Digital Repository |
| spelling | nottingham-363872020-05-04T17:08:41Z https://eprints.nottingham.ac.uk/36387/ 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 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. American Astronomical Society 2015-05-11 Article PeerReviewed 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 and Zheng, Tiantian (2015) P-MaNGA: gradients in recent star formation histories as diagnostics for galaxy growth and death. Astrophysical Journal, 804 (2). 125/1-125/19. ISSN 1538-4357 Galaxies: evolution Galaxies: formation Galaxies: general Galaxies: stellar content Methods: observational Surveys http://iopscience.iop.org/article/10.1088/0004-637X/804/2/125/meta doi:10.1088/0004-637X/804/2/125 doi:10.1088/0004-637X/804/2/125 |
| spellingShingle | Galaxies: evolution Galaxies: formation Galaxies: general Galaxies: stellar content Methods: observational Surveys 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 P-MaNGA: gradients in recent star formation histories as diagnostics for galaxy growth and death |
| title | P-MaNGA: gradients in recent star formation histories as diagnostics for galaxy growth and death |
| title_full | P-MaNGA: gradients in recent star formation histories as diagnostics for galaxy growth and death |
| title_fullStr | P-MaNGA: gradients in recent star formation histories as diagnostics for galaxy growth and death |
| title_full_unstemmed | P-MaNGA: gradients in recent star formation histories as diagnostics for galaxy growth and death |
| title_short | P-MaNGA: gradients in recent star formation histories as diagnostics for galaxy growth and death |
| title_sort | p-manga: gradients in recent star formation histories as diagnostics for galaxy growth and death |
| topic | Galaxies: evolution Galaxies: formation Galaxies: general Galaxies: stellar content Methods: observational Surveys |
| url | https://eprints.nottingham.ac.uk/36387/ https://eprints.nottingham.ac.uk/36387/ https://eprints.nottingham.ac.uk/36387/ |