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dc.contributor.authorLoomis, Ryan A.
dc.contributor.authorÖberg, Karin I.
dc.contributor.authorAndrews, Sean M.
dc.contributor.authorWalsh, Catherine
dc.contributor.authorCzekala, Ian
dc.contributor.authorHuang, Jane
dc.contributor.authorRosenfeld, Katherine A.
dc.identifier.citationLoomis , R A , Öberg , K I , Andrews , S M , Walsh , C , Czekala , I , Huang , J & Rosenfeld , K A 2018 , ' Detecting weak spectral lines in interferometric data through matched filtering ' , Astronomical Journal , vol. 155 , no. 4 , 182 .
dc.identifier.otherPURE: 293202125
dc.identifier.otherPURE UUID: b6ea5ce3-934c-47a4-a648-0489a8373159
dc.identifier.otherBibCode: 2018AJ....155..182L
dc.identifier.otherScopus: 85045694131
dc.identifier.otherORCID: /0000-0002-1483-8811/work/141643345
dc.descriptionFunding: R.A.L. and J.H. gratefully acknowledge funding from National Science Foundation Graduate Research Fellowships (Grant No. DGE-1144152). R.A.L. also acknowledges funding from the NRAO Student Observing Support Program. K.I.Ö. acknowledges funding from the Alfred P. Sloan Foundation and the David and Lucile Packard Foundation. C.W. acknowledges financial support from the Netherlands Organisation for Scientific Research (NWO, grant 639.041.335) and start-up funds from the University of Leeds, UK.en
dc.description.abstractModern radio interferometers enable observations of spectral lines with unprecedented spatial resolution and sensitivity. In spite of these technical advances, many lines of interest are still at best weakly detected and therefore necessitate detection and analysis techniques specialized for the low signal-to-noise ratio (S/N) regime. Matched filters can leverage knowledge of the source structure and kinematics to increase sensitivity of spectral line observations. Application of the filter in the native Fourier domain improves S/N while simultaneously avoiding the computational cost and ambiguities associated with imaging, making matched filtering a fast and robust method for weak spectral line detection. We demonstrate how an approximate matched filter can be constructed from a previously observed line or from a model of the source, and we show how this filter can be used to robustly infer a detection significance for weak spectral lines. When applied to ALMA Cycle 2 observations of CH3OH in the protoplanetary disk around TW Hya, the technique yields a ≈53% S/N boost over aperture-based spectral extraction methods, and we show that an even higher boost will be achieved for observations at higher spatial resolution. A Python-based open-source implementation of this technique is available under the MIT license at
dc.relation.ispartofAstronomical Journalen
dc.rightsCopyright © 2018 The American Astronomical Society. All rights reserved. This work has been made available online in accordance with publisher policies or with permission. Permission for further reuse of this content should be sought from the publisher or the rights holder. This is the final published version of the work, which was originally published at
dc.subjectMethods: data analysisen
dc.subjectProtoplanetary disksen
dc.subjectRadio lines: generalen
dc.subjectSubmillimeter: planetary systemsen
dc.subjectTechniques: interferometricen
dc.subjectTechniques: spectroscopicen
dc.subjectQB Astronomyen
dc.subjectQC Physicsen
dc.titleDetecting weak spectral lines in interferometric data through matched filteringen
dc.typeJournal articleen
dc.description.versionPublisher PDFen
dc.contributor.institutionUniversity of St Andrews. School of Physics and Astronomyen
dc.description.statusPeer revieweden

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