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NoiseChisel is a program to detect very low signal-to-noise ratio (S/N)features with minimal assumptions on their morphology. It was introduced in2015 and released within a collection of data analysis programs and librariesknown as GNU Astronomy Utilities (Gnuastro). The 10th stable version ofGnuastro was released in August 2019 and NoiseChisel has significantlyimproved: detecting even fainter signal, enabling better user control over itsinner workings, and many bug fixes. The most important change until version0.10 is that NoiseChisel's segmentation features have been moved into a newprogram called Segment. Another major change is the final growth strategy ofits true detections, for example NoiseChisel is able to detect the outer wingsof M51 down to S/N of 0.25, or 25.97 mag/arcsec2 on a single-exposure SDSSimage (r-band). Segment is also able to detect the localized HII regions as"clumps" much more successfully. For a detailed list of improvements afterversion 0.10, see the most recent manual. Finally, to orchestrate a controlledanalysis, the concept of reproducibility is discussed: this paper itself isexactly reproducible (commit 751467d).

Carving out the low surface brightness universe with NoiseChisel