SDSS-IV MaNGA: spatial resolved properties of kinematically misaligned galaxies

ABSTRACT We select 456 galaxies with kinematically misaligned gas and stellar components from 9456 parent galaxies in MaNGA, and classify them into 72 star-forming galaxies, 142 green-valley galaxies, and 242 quiescent galaxies. Comparing the spatial resolved properties of the misaligned galaxies wi...

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Bibliographic Details
Published in:	Monthly notices of the Royal Astronomical Society 2022-02, Vol.511 (4), p.4685-4696
Main Authors:	Xu, Haitong, Chen, Yanmei, Shi, Yong, Zhou, Yuren, Bizyaev, Dmitry, Bao, Min, Beom, Minje, Fernández-Trincado, José G, Cao, Xiao
Format:	Article
Language:	eng
Subjects:	Astronomy & Astrophysics ASTRONOMY AND ASTROPHYSICS galaxies: evolution galaxies: kinematics and dynamics
Online Access:	Get full text
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Summary:	ABSTRACT We select 456 galaxies with kinematically misaligned gas and stellar components from 9456 parent galaxies in MaNGA, and classify them into 72 star-forming galaxies, 142 green-valley galaxies, and 242 quiescent galaxies. Comparing the spatial resolved properties of the misaligned galaxies with control samples closely match in the Dn4000 and stellar velocity dispersion, we find that: (1) the misaligned galaxies have lower values in Vgas/σgas and Vstar/σstar (the ratio between ordered to random motion of gas and stellar components) across the entire galaxies than their control samples; (2) the star-forming and green-valley misaligned galaxies have enhanced central concentrated star formation than their control galaxies. The difference in stellar population between quiescent misaligned galaxies and control samples is small; (3) gas-phase metallicity of the green valley and quiescent misaligned galaxies are lower than the control samples. For the star-forming misaligned galaxies, the difference in metallicity between the misaligned galaxies and their control samples strongly depends on how we select the control samples. All these observational results suggest that external gas accretion influences the evolution of star forming and green-valley galaxies, not only in kinematics/morphologies, but also in stellar populations. However, the quiescent misaligned galaxies have survived from different formation mechanisms.
ISSN:	0035-8711 1365-2966