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Matched Filtering for the Canadian Hydrogen Observatory and Radio-transient Detector Galaxy Search

  • Authors: Hans S. Hopkins, Dustin Lang, Kendrick Smith, Kristine Spekkens, Simon Foreman, Akanksha Bij

Hans S. Hopkins et al 2026 The Astrophysical Journal 1008 .

  • Provider: AAS Journals

Caption: Figure 6.

The severity of aliasing as a function of the source’s position within the primary beam. In this simulation, CHORD is pointing at the zenith, and we vary the decl. of the source. A δdecl. of zero indicates that the source passes through the center of the primary beam, and a positive δdecl. indicates a source that is north of CHORD’s pointing. CHORD is most sensitive to a strip about 1° north and south of the decl. of its pointing. A catalog that is produced from a single strip will have entries with aliasing effects that vary depending on the decl. of the galaxies within that strip. Specifically, the north and south aliases will vary significantly. At some values of δdecl., the east alias becomes bimodal, and its value becomes difficult to track. However, at a correlation coefficient value of around 0.1, an alias has a negligible chance of causing mislocalization.

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