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      https://www.ias.ac.in/article/fulltext/joaa/038/01/0017

    • Keywords

       

      Cosmology: observations.

    • Abstract

       

      We developed a generic formalism to estimate the event rate and the redshift distribution of Fast Radio Bursts (FRBs) in our previous publication (Bera et al. 2016), considering FRBs are of an extragalactic origin. In this paper, we present (a) the predicted pulse widths of FRBs by considering two different scattering models, (b) the minimum total energy required to detect events, (c) the redshift distribution and (d) the detection rates of FRBs for the Ooty Wide Field Array (OWFA). The energy spectrum of FRBs is modelled as a power law with an exponent $-\alpha$ and our analysis spans a range $-3\leq \alpha \leq 5$. We find that OWFA will be capable of detecting FRBs with $\alpha\geq 0$. The redshift distribution and the event rates of FRBs are estimated by assuming two different energy distribution functions; a Delta function and a Schechter luminosity function with an exponent $-2\le \gamma \le 2$. We consider an empirical scattering model based on pulsar observations (model I) as well as a theoretical model (model II) expected for the intergalactic medium. The redshift distributions peak at a particular redshift $z_p$ for a fixed value of α, which lie in the range $0.3\leq z_p \leq 1$ for the scattering model I and remain flat and extend up to high redshifts ($z\lesssim 5$) for the scattering model II.

    • Author Affiliations

       

      Siddhartha Bhattacharyya1 Apurba Bera2 Somnath Bharadwaj1 3 N. D. Ramesh Bhat4 5 Jayaram N. Chengalur2

      1. Department of Physics, Indian Institute of Technology, Kharagpur 721 302, India.
      2. National Centre for Radio Astrophysics, Tata Institute of Fundamental Research, Pune 411 007, India.
      3. Centre for Theoretical Studies, Indian Institute of Technology, Kharagpur 721 302, India.
      4. International Centre for Radio Astronomy Research, Curtin University, Bentley, WA 6102, Australia.
      5. Australian Research Council Centre of Excellence for All-Sky Astrophysics (CAASTRO), The University of Sydney, NSW 2006, Australia.
    • Dates

       
  • Journal of Astrophysics and Astronomy | News

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