A statistical approach to studying galactic environments of FRBs using galaxy number density

Vignesh Vavillakula Venkataramana Rao^1*, Tetsuya Hashimoto¹, Tomotsugu Goto², Mohanraj Madheshwaran¹, Tzu-Yin Hsu², Sridhar Gajendran²

¹Physics, National Chung Hsing University, Taichung, Taiwan
²Physics, National Tsing Hua University,, Hsinchu, Taiwan

* Presenter:Vignesh Vavillakula Venkataramana Rao, email:vigneshvavilla@gmail.com

Fast radio bursts (FRB) are short-duration, brilliant radio emission pulses with energies in the order of several Jansky that last from microseconds to milliseconds. The exact origin of FRBs remains a mystery. FRBs are classified into repeaters and non-repeaters based on their repetition nature. The repeaters and non-repeaters may have distinct progenitor types including central engines that can emit multiple bursts and cataclysmic events, respectively. Therefore, understanding the difference between these two populations is a key to constraining their origins. However, there is no conclusive evidence to support this different progenitor case because of the poor localization of FRB. Here, we attempt to estimate the galaxy number density associated with FRBs in the CHIME catalog using the Pan-STARRS galaxy catalog. Since our method focuses on large-scale galaxy environments around FRBs, it is independent of the localization problem, allowing us to use samples of about one order of magnitude larger than localized FRBs. We present our findings by comparing the density increments of both repeaters and non-repeater sources. The Kolmogorov-Smirnov (K-S) test and cumulative density function (CDF) indicate no significant difference between the number-density environments of these FRB types suggesting the same progenitor and galactic environment.
Keywords: Fast Radio Bursts – Radio Astronomy – galaxy environment.

Keywords: Fast Radio Bursts, Galaxy environments, Radio Astronomy, radio continuum, transients