Finding Passive Galaxies in HI-MaNGA: The Impact of Star-Formation Rate Indicator
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| Main Authors: | , , , |
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| Format: | Preprint |
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2024
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| _version_ | 1866909316721672192 |
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| author | Salem, Nora Masters, Karen Stark, David Sharma, Anubhav |
| author_facet | Salem, Nora Masters, Karen Stark, David Sharma, Anubhav |
| contents | HI-rich galaxies typically have high star-formation rates (SFR), but there exist interesting HI-rich and low star-forming (low-SF) galaxies. Previous work on a sample of these galaxies identified from HI-MaNGA (HI follow-up to the MaNGA survey) using an infrared indicator of specific-SFR (sSFR; namely W2-W3~<2) could find no single physical process to explain their unusual behaviour. The method by which galaxies are identified as low sSFR may be important in this conclusion. In this Research Note, we explore how an HI-rich, low sSFR sample of HI-MaNGA galaxies differs using H alpha, single stellar population, and ultraviolet estimators of SFR. We find that samples are statistically similar to each other so long as W2-W3~<2 is interpreted as corresponding to sSFR<10^{-11.15} yr^{-1}. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2409_09574 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Finding Passive Galaxies in HI-MaNGA: The Impact of Star-Formation Rate Indicator Salem, Nora Masters, Karen Stark, David Sharma, Anubhav Astrophysics of Galaxies HI-rich galaxies typically have high star-formation rates (SFR), but there exist interesting HI-rich and low star-forming (low-SF) galaxies. Previous work on a sample of these galaxies identified from HI-MaNGA (HI follow-up to the MaNGA survey) using an infrared indicator of specific-SFR (sSFR; namely W2-W3~<2) could find no single physical process to explain their unusual behaviour. The method by which galaxies are identified as low sSFR may be important in this conclusion. In this Research Note, we explore how an HI-rich, low sSFR sample of HI-MaNGA galaxies differs using H alpha, single stellar population, and ultraviolet estimators of SFR. We find that samples are statistically similar to each other so long as W2-W3~<2 is interpreted as corresponding to sSFR<10^{-11.15} yr^{-1}. |
| title | Finding Passive Galaxies in HI-MaNGA: The Impact of Star-Formation Rate Indicator |
| topic | Astrophysics of Galaxies |
| url | https://arxiv.org/abs/2409.09574 |