Profound: Source extraction and application to modern survey data

A. S.G. Robotham, L. J.M. Davies, S. P. Driver, S. Koushan, D. S. Taranu, S. Casura, J. Liske

Research output: Contribution to journalArticle

23 Citations (Scopus)

Abstract

We introduce PROFOUND, a source finding and image analysis package. PROFOUND provides methods to detect sources in noisy images, generate segmentation maps identifying the pixels belonging to each source, and measure statistics like flux, size, and ellipticity. These inputs are key requirements of PROFIT, our recently released galaxy profiling package, where the design aim is that these two software packages will be used in unison to semi-automatically profile large samples of galaxies. The key novel feature introduced in PROFOUND is that all photometry is executed on dilated segmentation maps that fully contain the identifiable flux, rather than usingmore traditional circular or ellipse-based photometry. Also, to be less sensitive to pathological segmentation issues, the de-blending is made across saddle points in flux. We apply PROFOUND in a number of simulated and real-world cases, and demonstrate that it behaves reasonably given its stated design goals. In particular, it offers good initial parameter estimation for PROFIT, and also segmentation maps that follow the sometimes complex geometry of resolved sources, whilst capturing nearly all of the flux. Anumber of bulge-disc decomposition projects are already making use of the PROFOUND and PROFIT pipeline, and adoption is being encouraged by publicly releasing the software for the open source R data analysis platform under an LGPL-3 license on GitHub (github.com/asgr/ProFound).

Original languageEnglish
Pages (from-to)3137-3159
Number of pages23
JournalMonthly Notices of the Royal Astronomical Society
Volume476
Issue number3
DOIs
Publication statusPublished - 21 May 2018

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