Model independent approach for calculating galaxy rotation curves for low S/N MaNGA galaxies
arxiv(2024)
摘要
Internal kinematics of galaxies, traced through the stellar rotation curve or
two dimensional velocity map, carry important information on galactic structure
and dark matter. With upcoming surveys, the velocity map may play a key role in
the development of kinematic lensing as an astrophysical probe. We improve
techniques for extracting velocity information from integral field spectroscopy
at low signal-to-noise (S/N), without a template, and demonstrate substantial
advantages over the standard Penalized PiXel-Fitting method (pPXF) approach. We
note that Robust rotation curves can be derived down to S/N≈ 2 using
our method.
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