Interpretation of fast radio bursts from CHIME/FRB baseband data
Year: 2026
Type: article
Abstract: Fast radio bursts (FRBs) are radio pulses that originate from cosmological distances. Thousands of FRB sources have been discovered, but their origins remain unknown. Analyses of the energy function and redshift evolution of the volumetric event rate could provide crucial insights into FRB progenitors. In this paper, we used the V_ method to analyse the FRB energy functions and volumetric event rate evolution based on CHIME/FRB BaseCat 1 data. The baseband data provide improved fluence and bandwidth measurements compared to Catalogue 1, enabling a more robust analysis of FRB energy and population studies. The V_ . Neither the cosmic star formation rate density (SFRD) nor the cosmic stellar-mass density scenario can be ruled out. We further discuss the scenario that FRBs are primarily produced from systems that evolve with a delay relative to SFRD. The rate evolution trend suggests a scenario of a delayed model with a delay time τ ≈ 4.66 Gyr, hinting at delayed core-collapse supernovae or compact binary mergers. Our work highlights the importance of baseband data, and the BaseCat 2 data are required to explore FRB populations and rate evolution. method allows us to investigate volumetric event rate evolution as a function of redshift without any prior assumptions. The selection functions for baseband data were derived to re-weight the samples when calculating the number density. We observe Schechter-like shapes for the energy function with a unified slope index of γ ∈ -1.8, -1.6
Source: Astronomy and Astrophysics
Language: English
Subfield: Astronomy and Astrophysics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: gold
Estimated APC paid: $1,865
OpenAlex ID: W7223145378