Low redshift post-starburst galaxies host abundant HI reservoirs
Studying the gas content of post-starburst (PSB) galaxies can provide valuable clues regarding the process of fast quenching. Although previous works have studied the molecular gas content of PSBs, only a handful of HI measurements exist. Here, we present new Five hundred metre Aperture Spherical Te...
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| Main Authors: | , , , , , , , , , , |
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| Format: | Article |
| Language: | English |
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Maynooth Academic Publishing
2025-07-01
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| Series: | The Open Journal of Astrophysics |
| Online Access: | https://doi.org/10.33232/001c.141941 |
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| author | Sara Ellison Qifeng Huang Dong Yang Jing Wang Vivienne Wild Ben Rasmussen Maria-Jesus Jimenez-Donaire Kate Rowlands Scott Wilkinson Toby Brown Ho-Hin Leung |
| author_facet | Sara Ellison Qifeng Huang Dong Yang Jing Wang Vivienne Wild Ben Rasmussen Maria-Jesus Jimenez-Donaire Kate Rowlands Scott Wilkinson Toby Brown Ho-Hin Leung |
| author_sort | Sara Ellison |
| collection | DOAJ |
| description | Studying the gas content of post-starburst (PSB) galaxies can provide valuable clues regarding the process of fast quenching. Although previous works have studied the molecular gas content of PSBs, only a handful of HI measurements exist. Here, we present new Five hundred metre Aperture Spherical Telescope (FAST) 21cm observations of 44 PSBs, leading to 43 detections or sensitive upper limits of HI, which we combine with 25 archival measurements, for a total sample of 68 PSB MHI measurements. HI is detected in 57/68 galaxies, with HI masses ranging from MHI ~10^8.5 up to 10^10 Msun and gas fractions (fHI = MHI/M*) from a few percent up to almost 30 percent. Post-starbursts therefore retain ample atomic gas reservoirs, despite no longer forming stars. By comparing with a stellar mass-matched sample of star-forming galaxies in xGASS, we find that PSBs have, on average, gas fractions lower by ~0.2-0.4 dex, consistent with a mild reduction compared with their progenitor population. However, PSBs show a diversity of HI properties; about half have HI gas masses within the expected scatter of the star-forming population with the remaining 50 per cent up to a factor of 10 more gas-poor. Compared with galaxies in the green valley, about two thirds of PSBs have gas fractions within the expected range, with the remaining third up to a factor of 10 more gas-rich. Our results demonstrate that quenching in PSBs is not the result of wholesale removal of the atomic gas reservoir and that the population has atomic gas fractions that span the range from star-forming to green valley galaxies. We find no correlation between HI gas mass and time since burst; even galaxies a Gyr past their burst can remain HI-normal. The significant gas reservoirs remaining in many PSBs leaves open the possibility for future rekindling of star formation. |
| format | Article |
| id | doaj-art-db8604c9b80f4d05b389d0dfc8d6ac0a |
| institution | Matheson Library |
| issn | 2565-6120 |
| language | English |
| publishDate | 2025-07-01 |
| publisher | Maynooth Academic Publishing |
| record_format | Article |
| series | The Open Journal of Astrophysics |
| spelling | doaj-art-db8604c9b80f4d05b389d0dfc8d6ac0a2025-07-08T19:22:25ZengMaynooth Academic PublishingThe Open Journal of Astrophysics2565-61202025-07-018Low redshift post-starburst galaxies host abundant HI reservoirsSara EllisonQifeng HuangDong YangJing WangVivienne WildBen RasmussenMaria-Jesus Jimenez-DonaireKate RowlandsScott WilkinsonToby BrownHo-Hin LeungStudying the gas content of post-starburst (PSB) galaxies can provide valuable clues regarding the process of fast quenching. Although previous works have studied the molecular gas content of PSBs, only a handful of HI measurements exist. Here, we present new Five hundred metre Aperture Spherical Telescope (FAST) 21cm observations of 44 PSBs, leading to 43 detections or sensitive upper limits of HI, which we combine with 25 archival measurements, for a total sample of 68 PSB MHI measurements. HI is detected in 57/68 galaxies, with HI masses ranging from MHI ~10^8.5 up to 10^10 Msun and gas fractions (fHI = MHI/M*) from a few percent up to almost 30 percent. Post-starbursts therefore retain ample atomic gas reservoirs, despite no longer forming stars. By comparing with a stellar mass-matched sample of star-forming galaxies in xGASS, we find that PSBs have, on average, gas fractions lower by ~0.2-0.4 dex, consistent with a mild reduction compared with their progenitor population. However, PSBs show a diversity of HI properties; about half have HI gas masses within the expected scatter of the star-forming population with the remaining 50 per cent up to a factor of 10 more gas-poor. Compared with galaxies in the green valley, about two thirds of PSBs have gas fractions within the expected range, with the remaining third up to a factor of 10 more gas-rich. Our results demonstrate that quenching in PSBs is not the result of wholesale removal of the atomic gas reservoir and that the population has atomic gas fractions that span the range from star-forming to green valley galaxies. We find no correlation between HI gas mass and time since burst; even galaxies a Gyr past their burst can remain HI-normal. The significant gas reservoirs remaining in many PSBs leaves open the possibility for future rekindling of star formation.https://doi.org/10.33232/001c.141941 |
| spellingShingle | Sara Ellison Qifeng Huang Dong Yang Jing Wang Vivienne Wild Ben Rasmussen Maria-Jesus Jimenez-Donaire Kate Rowlands Scott Wilkinson Toby Brown Ho-Hin Leung Low redshift post-starburst galaxies host abundant HI reservoirs The Open Journal of Astrophysics |
| title | Low redshift post-starburst galaxies host abundant HI reservoirs |
| title_full | Low redshift post-starburst galaxies host abundant HI reservoirs |
| title_fullStr | Low redshift post-starburst galaxies host abundant HI reservoirs |
| title_full_unstemmed | Low redshift post-starburst galaxies host abundant HI reservoirs |
| title_short | Low redshift post-starburst galaxies host abundant HI reservoirs |
| title_sort | low redshift post starburst galaxies host abundant hi reservoirs |
| url | https://doi.org/10.33232/001c.141941 |
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