http://arxiv.org/abs/1907.10188
In this work we introduce the curvature of a galaxy brightness profile to identify its structural subcomponents in a non-parametrically fashion. Bulges, bars, disks, lens, rings and spiral arms are key to understand the formation and evolution path the galaxy undertook. Identifying them is also crucial for morphological classification of galaxies. We measure and analyse in detail the curvature of $14$ galaxies with varied morphology. High (low) steepness profiles show high (low) curvature measures. Transitions between components are identified as local peaks oscillations in the values of the curvature. We identify patterns that characterise bulges (pseudo or classic), disks, bars and rings. This method can be automated to identify galaxy components in large datasets or to provide a reliable starting point for traditional multicomponent modelling of galaxy light distribution.
G. Lucatelli and F. Ferrari
Thu, 25 Jul 19
12/72
Comments: 21 pages, 19 figures. Submitted to Monthly Notices of the Royal Astronomical Society (MNRAS)
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