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Trial dispersion measure spacing in fast radio burst searches with HEIMDALL

E. F. Keane, D. J. McKenna

Abstract

Fast radio bursts (FRBs) are brief flashes of emission detectable to cosmological distances. Cosmology applications rely on an understanding of how the detected sample relates to the underlying population. To this end we examine the dispersion measure `tolerance' parameter employed by the FRB search tool \textsc{heimdall} and provide the relation between this and minimum search depth. Several FRB samples can be `retro-fitted' using this to more properly account for survey completeness.

Trial dispersion measure spacing in fast radio burst searches with HEIMDALL

Abstract

Fast radio bursts (FRBs) are brief flashes of emission detectable to cosmological distances. Cosmology applications rely on an understanding of how the detected sample relates to the underlying population. To this end we examine the dispersion measure `tolerance' parameter employed by the FRB search tool \textsc{heimdall} and provide the relation between this and minimum search depth. Several FRB samples can be `retro-fitted' using this to more properly account for survey completeness.
Paper Structure (3 sections, 1 figure)

This paper contains 3 sections, 1 figure.

Table of Contents

  1. HEIMDALL & DEDISP
  2. DM tolerance
  3. Results

Figures (1)

  • Figure 1: Left: the Parkes response for dm_tol of $1.25$ shows the minima of the sensitivity scallops reaching $1/\sqrt{1.25}=0.894$. Responses for DM values of 0, 100 and 1000 pc/cc are shown for illustration. Right: the response for DM trials determined by heimdall. Here the right-most vertical axis shows the relative response as calculated byheimdall. The full scalloped response of the $(i)^{\rm th}$ trial is shown (lighter curves) all the way to the $(i+1)^{\rm th}$ sample to illustrate how DM steps are chosen.