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ProFit : Bayesian profile fitting of galaxy images

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Robotham_2016_ProFit_MNRAS_1513.pdf (10.46Mb)
Date
04/2017
Author
Robotham, A. S. G.
Taranu, D. S.
Tobar, R.
Moffett, A.
Driver, S. P.
Keywords
Methods: data analysis
Methods: statistical
Techniques: photometric
Galaxies: fundamental parameters
Galaxiess: statistics
Galaxies: structure
QB Astronomy
QC Physics
DAS
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Abstract
We present ProFit, a new code for Bayesian two-dimensional photometric galaxy profile modelling. ProFit consists of a low-level c++ library (libprofit), accessible via a command-line interface and documented API, along with high-level R (ProFit) and Python (PyProFit) interfaces (available at github.com/ICRAR/libprofit, github.com/ICRAR/ProFit, and github.com/ICRAR/pyprofit, respectively). R ProFit is also available pre-built from cran; however, this version will be slightly behind the latest GitHub version. libprofit offers fast and accurate two-dimensional integration for a useful number of profiles, including Sérsic, Core-Sérsic, broken-exponential, Ferrer, Moffat, empirical King, point-source, and sky, with a simple mechanism for adding new profiles. We show detailed comparisons between libprofit and galfit. libprofit is both faster and more accurate than galfit at integrating the ubiquitous Sérsic profile for the most common values of the Sérsic index n (0.5 < n < 8). The high-level fitting code ProFit is tested on a sample of galaxies with both SDSS and deeper KiDS imaging. We find good agreement in the fit parameters, with larger scatter in best-fitting parameters from fitting images from different sources (SDSS versus KiDS) than from using different codes (ProFit versus galfit). A large suite of Monte Carlo-simulated images are used to assess prospects for automated bulge-disc decomposition with ProFit on SDSS, KiDS, and future LSST imaging. We find that the biggest increases in fit quality come from moving from SDSS- to KiDS-quality data, with less significant gains moving from KiDS to LSST.
Citation
Robotham , A S G , Taranu , D S , Tobar , R , Moffett , A & Driver , S P 2017 , ' ProFit : Bayesian profile fitting of galaxy images ' , Monthly Notices of the Royal Astronomical Society , vol. 466 , no. 2 , pp. 1513-1541 . https://doi.org/10.1093/mnras/stw3039
Publication
Monthly Notices of the Royal Astronomical Society
Status
Peer reviewed
DOI
https://doi.org/10.1093/mnras/stw3039
ISSN
0035-8711
Type
Journal article
Rights
© 2016, the Author(s). This work has been made available online in accordance with the publisher’s policies. This is the final published version of the work, which was originally published at https://doi.org/10.1093/mnras/stw3039
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  • University of St Andrews Research
URL
http://arxiv.org/abs/1611.08586v2
URI
http://hdl.handle.net/10023/12574

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