SoFiA 2: An automated, parallel HI source finding pipeline
T. Westmeier, Slava Kitaeff, D. Pallot, P. Serra, J. M. van der Hulst, Russell J. Jurek, Ahmed Elagali, Bi‐Qing For, Dane Kleiner, Bärbel Silvia Koribalski, K. Lee-Waddell, J. R. Mould, T. Reynolds, J.H.M.M. van Rhee, Lister Staveley‐Smith · UWA Profiles and Research Repository (UWA) · 2021
SoFiA 2 is a fully automated spectral-line source finding pipeline originally intended for the detection of galaxies in large HI data cubes. It is a reimplementation of parts of the original SoFiA pipeline (ascl:1412.001) in the C programming language and uses OpenMP for multithreading, making it substantially faster and more memory-efficient than its predecessor. At its core, SoFiA 2 uses the Smooth + Clip algorithm for source finding which operates by spatially and spectrally smoothing the data on multiple scales and applying a user-defined flux threshold relative to the noise level in each iteration. A wide range of useful preconditioning and post-processing filters is available, including noise normalization, flagging of artifacts and reliability filtering. In addition to global data products and source catalogs in different formats, SoFiA 2 can also generate cutout images and spectra for each individual detection.