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https://tkuir.lib.tku.edu.tw/dspace/handle/987654321/127409
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| Title: | The resolved star-formation efficiency of early-type galaxies |
| Authors: | Thomas G. Williams, Francesco Belfiore, Martin Bureau, Ashley T. Barnes, Frank Bigiel, Woorak Choi, Ryan Chown, Dario Colombo, Daniel A. Dale, Timothy A. Davis, Jacob Elford, Jindra Gensior, Simon C. O. Glover, Brent Groves, Ralf S. Klessen, Fu-Heng Liang, Hsi-An Pan, Ilaria Ruffa, Toshiki Saito, Patricia Sánchez-Blázquez, Marc Sarzi, Eva Schinnerer |
| Keywords: | galaxies: elliptical and lenticular, galaxies: ISM, galaxies: star formation, submillimetre: ISM |
| Date: | 2025-04 |
| Issue Date: | 2025-06-05 12:05:16 (UTC+8) |
| Abstract: | Understanding how and why star formation varies between galaxies is fundamental to our comprehension of galaxy evolution. In particular, the star-formation efficiency (SFE; star-formation rate or SFR per unit cold gas mass) has been shown to vary substantially both across and within galaxies. Early-type galaxies (ETGs) constitute an extreme case, as about a quarter have detectable molecular gas reservoirs but little to no detectable star formation. In this work, we present a spatially resolved view of the SFE in 10 ETGs, combining state-of-the-art Atacama Large Millimeter/submillimeter Array (ALMA) and Multi Unit Spectroscopic Explorer (MUSE) observations. Optical spectroscopic line diagnostics are used to identify the ionized emission regions dominated by star formation, and reject regions where the ionization arises primarily from other sources. We identify very few regions where the ionization is consistent with pure star formation. Using Ha as our SFR tracer, we find that previous integrated measurements of the star-formation rate based on UV and 22 um emission are systematically higher than the SFR measured from Ha
. However, for the small number of regions where ionization is primarily associated with star formation, the SFEs are around 0.4 dex higher than those measured in star-forming galaxies at a similar spatial resolution (with depletion times ranging from
108 to 1010yr). Whilst the SFE of ETGs is overall low, we find that the SFEs of individual regions within ETGs can be similar to, or higher than, similar sized regions within star-forming galaxies. |
| Relation: | Monthly Notices of the Royal Astronomical Society 538( 4), p.3219-3246 |
| DOI: | 10.1093/mnras/staf498 |
| Appears in Collections: | [物理學系暨研究所] 期刊論文
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