Poster Presentation

Diverse Properties of Molecular Gas in the Host Galaxies of Fast Radio Bursts

Author(s): Bunyo Hatsukade (The University of Tokyo)

Presenter: Bunyo Hatsukade (The University of Tokyo)

Fast radio bursts (FRBs) are bright, energetic radio pulses with a duration of microseconds to milliseconds. Since the discovery in 2007, thousands of FRBs have been detected; however, their physical mechanism and progenitors are still unknown. We conducted CO observations of their host galaxies to study the galaxy environments producing progenitors. We make a sample of six FRB host galaxies obtained from CO observations with ALMA and in the literature, allowing us to compare the properties with other galaxy populations for the first time. We found diversity in molecular gas properties (gas mass, gas depletion time, and gas fraction to stellar mass) in the sample. Statistical analysis shows a significant difference in the distribution of molecular gas fraction between the FRB hosts and local star-forming galaxies. Our findings suggest that FRBs arise from multiple progenitors or single progenitors that can exist in a wide range of galaxy environments.