| Name: | Mukul Bhattacharya |
| Affiliation: | University of Wisconsin, Madison, USA |
| Conference ID: | ASI2025_499 |
| Title: | Fast radio bursts: source properties, emission mechanism and cosmological applications |
| Authors: | Mukul Bhattacharya 1,2, Pawan Kumar 3, Kohta Murase 2, Eric Linder 4, Kazumi Kashiyama 5, 6 |
| Authors Affiliation: | 1 Wisconsin IceCube Particle Astrophysics Center, University of Wisconsin, Madison, WI 53703, USA
2 Department of Physics; Center for Multimessenger Astrophysics, Institute for Gravitation and the Cosmos, The Pennsylvania State University, University Park, PA 16802, USA
3 Department of Astronomy, University of Texas at Austin, Austin, TX 78712, USA
4 Berkeley Center for Cosmological Physics & Berkeley Lab, University of California, Berkeley, CA 94720, USA
5 Astronomical Institute, Tohoku University, Sendai 980-8578, Japan
6 Kavli Institute for the Physics and Mathematics of the Universe, The University of Tokyo,
Kashiwa 277-8583, Japan |
| Mode of Presentation: | Oral |
| Abstract Category: | High Energy Phenomena, Fundamental Physics and Astronomy |
| Abstract: | Fast radio bursts (FRBs) are energetic millisecond duration pulses, located at cosmological distances, whose physical origin is still debated more than a decade since their discovery. The detection of a Galactic FRB in April 2020 suggested that at least some FRBs can originate from magnetars. Characterizing FRB source population will help optimize future search strategies, and provide valuable insights regarding their progenitor models as well as the source environment. In this talk, I will first describe a generalized framework that can be utilized to constrain properties of the FRB source, host galaxy and intervening medium directly from their multi-band radio observations. Next, I will discuss the mechanism for the production of coherent radio bursts that are likely accompanied by persistent radio emission originating from the magnetized wind nebula surrounding the central neutron star (NS). These late-time radio emission have now been detected for three localized repeating sources and they provide direct constraints on the age, magnetic field, spin period of the NS as well as the energy density of the environment. Lastly, I will discuss how a fluence-limited survey of cosmological FRBs can be used as a potential probe to investigate He reionization history using the dispersion measure distribution of these sources to help reveal energetic processes in the early Universe. |
