Poster Presentation

Using Cross-Correlation Functions to Constrain the Host Environment of Fast Radio Bursts

Author(s): Zi-Jia Lai (National Cheng Kung University) I-Non Chiu (National Cheng Kung University)

Presenter: Zi-Jia Lai (National Cheng Kung University)

Fast Radio Bursts (FRBs) are millisecond-duration extragalactic radio-wave emitters. Due to poor localizations of angular positions and uncertainties in estimating redshifts, there are only about 20 localized FRBs. Hence the possible progenitors of FRBs are still under debate.
We aim to use cross-correlation functions to constrain the host environment of FRBs. We generate mock FRB catalogs by using N-body simulation halo catalogs from Takahashi et al. (2017). First, we estimate the number of galaxies for a given stellar mass range of each halo by the stellar-to-halo mass relation and the halo occupation distribution in Shuntov et al. (2022). Then we distribute satellite galaxies from the NFW profile around the center of each halo. Afterwards, we model the FRB rate of each galaxy assuming two scenarios: In the first case, we assume that the FRB rate is proportional to the total stellar mass, representing that the FRB rate is mainly dominated by old stellar populations. In the second case, we assume that the FRB rate is proportional to the star formation rate, in which FRB events occur due to activities of young stellar populations. Therefore, we use cross-correlation functions to compare the above two conditions with the observed CHIME/FRB data.
Afterwards, we transform redshift of every mock FRB into dispersion measure by using relations in Macquart et al. (2020) and model observed fluences of mock FRBs by the derived Schechter energy function in Hashimoto et al. (2023). Then we check whether our simulation results are consistent with the observed CHIME/FRB data.