Exploring the Origin of Rejuvenating Gas from MaNGA Nearby Galaxies

[2510.25216] Exploring the Origin of Rejuvenating Gas from MaNGA Nearby Galaxies Skip to main content Search Submit Donate Log in Astrophysics > Astrophysics of Galaxies arXiv:2510.25216 (astro-ph) [Submitted on 29 Oct 2025 ( v1 ), last revised 25 Aug 2026 (this version, v2)] Title: Exploring the Origin of Rejuvenating Gas from MaNGA Nearby Galaxies Authors: Ting-Hsuan Li , Po-Feng Wu View PDF HTML (experimental) Abstract: This study investigates the origin of secondary star formation, i.e., rejuvenation in nearby galaxies. From the MaNGA IFU survey, we use stellar absorption features, D$_n$4000 and EW(H$\mathrm{\delta_A}$), to identify regions that started the rejuvenation within the last $\sim$200~Myr and use gas-phase metallicity as a primary tracer for accretion of pristine gas, in order to verify the mechanism that triggers the rejuvenation. We compare the metallicity and the velocity of rejuvenating regions with typical star-forming regions. We also compare metallicity gradients, environments, \ion{H}{1} gas fractions, and visual morphologies of galaxies hosting rejuvenating regions to controlled star-forming and quiescent galaxy samples. Overall, we do not find the rejuvenating regions or their hosts show anomalies in metallicity, kinematics, and visual morphology to the controlled comparison samples. These observations suggest that local rejuvenation is likely fueled by gas already residing within the host rather than accreted from outside, and reflect the short life time of small scale dense gas clouds. On the contrary, if the rejuvenation is fueled by gas accretion, the chemical and mixing timescale should be much shorter than $\sim100$ Myr so that no chemical and kinematical anomalies are measured. Meanwhile, we report a clear case of a massive quiescent galaxy brought back to star-forming by accreting gas. Our method of identifying rejuvenation is simple and effective, and can be applied to large spectroscopic surveys to investigate the origin of rejuvenation across cosmic time. Comments: Accepted for publication in ApJ. DOI: this https URL Subjects: Astrophysics of Galaxies (astro-ph.GA) Cite as: arXiv:2510.25216 [astro-ph.GA] (or arXiv:2510.25216v2 [astro-ph.GA] for this version) https://doi.org/10.48550/arXiv.2510.25216 Focus to learn more arXiv-issued DOI via DataCite Submission history From: Ting-Hsuan Li [ view email ] [v1] Wed, 29 Oct 2025 06:42:39 UTC (2,330 KB) [v2] Tue, 25 Aug 2026 03:15:09 UTC (7,249 KB) Full-text links: Access Paper: View PDF HTML (experimental) TeX Source view license Current browse context: astro-ph.GA < prev | next > new | recent | 2025-10 Change to browse by: astro-ph References & Citations SciX Google Scholar Semantic Scholar export BibTeX citation Bookmark Bibliographic Tools Bibliographic and Citation Tools Bibliographic Explorer Toggle Bibliographic Explorer ( What is the Explorer? ) Connected Papers Toggle Connected Papers ( What is Connected Papers? ) Litmaps Toggle Litmaps ( What is Litmaps? ) scite.ai Toggle scite Smart Citations ( What are Smart Citations? ) Code, Data, Media Code, Data and Media Associated with this Article alphaXiv Toggle alphaXiv ( What is alphaXiv? ) Links to Code Toggle CatalyzeX Code Finder for Papers ( What is CatalyzeX? ) DagsHub Toggle DagsHub ( What is DagsHub? ) GotitPub Toggle Gotit.pub ( What is GotitPub? ) Huggingface Toggle Hugging Face ( What is Huggingface? ) ScienceCast Toggle ScienceCast ( What is ScienceCast? ) Demos Demos Replicate Toggle Replicate ( What is Replicate? ) Spaces Toggle Hugging Face Spaces ( What is Spaces? ) Spaces Toggle TXYZ.AI ( What is TXYZ.AI? ) Related Papers Recommenders and Search Tools Link to Influence Flower Influence Flower ( What are Influence Flowers? ) Core recommender toggle CORE Recommender ( What is CORE? ) IArxiv recommender toggle IArxiv Recommender ( What is IArxiv? ) Author Venue Institution Topic About arXivLabs arXivLabs: experimental projects with community collaborators arXivLabs is a framework that allows collaborators to develop and share new arXiv features directly on our website. Both individuals and organizations that work with arXivLabs have embraced and accepted our values of openness, community, excellence, and user data privacy. arXiv is committed to these values and only works with partners that adhere to them. Have an idea for a project that will add value for arXiv's community? Learn more about arXivLabs . Which authors of this paper are endorsers? | Disable MathJax ( What is MathJax? ) We gratefully acknowledge support from our major funders , member institutions , and all contributors. About · Help · Contact · Subscribe · Copyright · Privacy · Accessibility · Operational Status (opens in new tab)

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