http://arxiv.org/abs/2304.11712
We analyze the global stellar population, radial gradients and non-parametric star formation history of $\sim 10$K galaxies from the MaNGA Survey final data release 17 (DR17), based on stellar population synthesis and full-spectrum fitting, and relate them with dynamical properties of galaxies. We confirm that stellar population correlates with stellar velocity dispersion $\sigma_{\rm e}$ better than with stellar mass $M_{\ast}$, but also find that younger galaxies are more metal-poor at fixed $\sigma_{\rm e}$. Stellar age, metallicity, and mass-to-light ratio $M_{\ast}/L$ all decrease with galaxy rotation, while radial gradients become more negative (i.e., younger, more metal-poor, and lower $M_{\ast}/L$ in the outskirts). The trend between metallicity gradients and rotation reverses for slow rotators, which stand out for their more negative metallicity gradients than faster-rotating galaxies. We highlight a population of massive disk galaxies on the green valley, on the $(\sigma_{\rm e},\rm Age)$ plane, that show steep negative age and metallicity gradients, consistent with their old central bulges surrounded by young star-forming disks and metal-poor gas accretion. Galaxies with high $\sigma_{\rm e}$, steep total mass-density slope, low dark matter fraction, high $M_{\ast}/L$, and high metallicity have the highest star-formation rate at earlier times, and are currently quenched. We discover a population of low-mass star-forming galaxies with low rotation but physically distinct from the massive slow rotators. A catalogue of the population properties is provided publicly.
S. Lu, K. Zhu, M. Cappellari, et. al.
Tue, 25 Apr 23
29/72
Comments: 23 pages, 18 figures, 1 table. Submitted to MNRAS. The catalogue will become available at this https URL once the paper is published by MNRAS