Post-starburst galaxies in SDSS-IV MaNGA: Two broad categories of evolutionary pathways

• DOI: 10.48550/arxiv.2312.03616
• Publication Date: 2023-01-01
• Authors: Zhuo Cheng; Cheng Li; Niu Li; Renbin Yan; H. J. Mo
• Keywords: Stellar mass; Star (game theory); Control sample

We study the size-mass relation (SMR) and recent star formation history (SFH) of post-starburst (PSB) galaxies in local Universe, using spatially resolved spectroscopy from final data release MaNGA. Our sample includes 489 PSB galaxies: 94 cPSB with central regions, 85 rPSB ring-like regions 310 iPSB irregular regions. When compared to control similar SFR, redshift mass, a SMR is found for all types samples except which have smaller sizes at intermediate masses ($9.5\lesssim \log_{10}(\rm M_\ast/M_\odot)\lesssim 10.5$). The star-forming sequence (iPSB-SF) show no/weak gradients $\textrm{D}_{n}(4000)$, $\textrm{EW}(\textrm{H}\delta_{A})$ $\textrm{EW}(\textrm{H}\alpha)$, consistent global status this type galaxies, while quiescent (iPSB-Q) shows negative $\textrm{D}_{n}(4000)$ positive $\textrm{EW}(\textrm{H}\delta_{A})$, indicating older stellar populations inner Both younger These results imply that four can be broadly divided into two distinct categories terms evolutionary pathway: (1) iPSB-SF iPSB-Q SMRs SFHs preferring an inside-out quenching process, (2) appear different stages same event, likely follow outside-in process driven by disruption events such as mergers result more compact structure proceeds.