Speaker
Description
Fast Radio Bursts (FRBs) are energetic, millisecond radio signals from cosmological distances. The nature of FRBs, especially their short duration, leads to a lack of well-localized FRBs, being the major challenge for studies on FRB progenitors. The key measurement is the delay time between FRB emergence and past star formation in their host galaxy, called the delay time distribution (DTD). DTD significantly depends on the progenitor types (young/old or single/binary systems). Therefore, it allows us to constrain the FRB progenitor. However, previous studies are limited to the DTD measurements for the entire host galaxies, which are less sensitive to the true delay time at the locations of FRBs, and thus cannot effectively narrow down the possibility of the progenitor type. In our study, we focus on the local star formation history (SFH) and provide DTD at the exact sites of FRBs for the first time. We used archive data of the optical integral field spectrograph, VLT/MUSE, for 6 FRB host galaxies. We conducted spectral energy distribution fitting for the host galaxies and FRB sites with pPXF. For several FRBs’ locations, we found stellar components that are distinct from the global environment. We will discuss case-by-case scenarios and the statistical comparison between FRB sites and the global region.
| Participate the oral/poster presentation award competition | Yes |
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