Speaker
Description
Fast radio bursts (FRBs) are millisecond-duration radio transients whose physical origin remains unknown. Different progenitor channels are expected to arise in distinct host-galaxy environments. However, most previous studies have been limited to analyses of entire host galaxies rather than the immediate environments of FRB sites. Spatially resolved studies are therefore essential for placing direct constraints on progenitor environments. Among the environmental properties, metallicity is particularly important because it governs the stellar evolution of progenitor systems. In this project, we investigate the gas-phase metallicity of six localized FRB host galaxies using optical integral-field spectroscopic data obtained with the Multi Unit Spectroscopic Explorer (MUSE) mounted on the Very Large Telescope (VLT). The sample is selected based on the availability of suitable MUSE observations, and sufficient localization accuracy and reliable spatial association between the FRB position and its host galaxy. We measure key nebular emission lines, including Hβ, [O III] λ5007, Hα, and [N II] λ6584, and estimate metallicities using the O3N2 index. While previous studies have mainly focused on global metallicity, this project will provide the first systematic investigation of local metallicity at FRB sites. By comparing the global and local metallicities of the host galaxies, this study will provide a more direct probe of the immediate FRB environments, test whether FRBs preferentially occur in chemically distinct regions within their hosts, and place tighter constraints on their progenitor populations.
| Participate the oral/poster presentation award competition | Yes |
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