SDSS-IV MaNGA: a distinct mass distribution explored in slow-rotating early-type galaxies
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Date
2018
Journal Title
Journal ISSN
Volume Title
Publisher
OXFORD UNIV PRESS
Abstract
We study the radial acceleration relation (RAR) for early-type galaxies (ETGs) in the SDSS MaNGA MPL5 data set. The complete ETG sample show a slightly offset RAR from the relation reported by McGaugh et al. (2016) at the low-acceleration end; we find that the deviation is due to the fact that the slow rotators show a systematically higher acceleration relation than the McGaugh's RAR, while the fast rotators show a consistent acceleration relation to McGaugh's RAR. There is a 1 sigma significant difference between the acceleration relations of the fast and slow rotators, suggesting that the acceleration relation correlates with the galactic spins, and that the slow rotators may have a different mass distribution compared with fast rotators and late-type galaxies. We suspect that the acceleration relation deviation of slow rotators may be attributed to more galaxy merger events, which would disrupt the original spins and correlated distributions of baryons and dark matter orbits in galaxies.
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Keywords
galaxies: elliptical and lenticular, cD, galaxies: kinematics and dynamics, dark matter, TO-LIGHT RATIO, MULTI-GAUSSIAN EXPANSION, ATLAS(3D) PROJECT, SAURON PROJECT, MODELS, KINEMATICS, TELESCOPE, RECOVERY