Matched Filtering for the Canadian Hydrogen Observatory and Radio-Transient Detector Galaxy Search
Hans S. Hopkins, Dustin Lang, Kendrick Smith, Kristine Spekkens, Simon Foreman, Akanksha Bij

TL;DR
This paper develops a matched filtering strategy for the CHORD radio telescope to detect galaxies via the 21 cm line, addressing spatial aliasing issues and proposing an optimal observation strategy.
Contribution
It introduces a novel spatial signal extraction method using matched filters and a prediction tool for alias mitigation in the CHORD survey.
Findings
Aliasing is distinguishable over time with data combination.
Offset scanning improves alias resolution.
Optimal re-pointing in declination reduces degeneracy.
Abstract
We present the spatial part of the point source signal extraction strategy for the upcoming CHORD galaxy survey. CHORD, the Canadian Hydrogen Observatory and Radio-transient Detector, is an under-construction drift-scanning compact interferometric radio telescope. CHORD comprises 512 six meter dishes and observes in the 300 to 1500 MHz frequency range. One of its science goals is producing a catalogue of galaxies detected by the neutral hydrogen (HI) 21 cm emission line. CHORD's highly redundant dish layout creates the problem of spatial aliasing, the effect where the same signal could be feasibly produced from sources at multiple locations on the sky. The search will be done with a matched filter in the visibility plane. This paper presents the search strategy and a prediction tool that can quickly estimate the matched filter response at a given sky position, allowing a prediction of…
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Taxonomy
TopicsRadio Astronomy Observations and Technology · Galaxies: Formation, Evolution, Phenomena · Astronomy and Astrophysical Research
