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We use a sample of ~3000 galaxies from the MaNGA MPL-7 internal data releaseto study the alpha abundance distribution within low-redshift galaxies. We usethe Lick index ratio Mgb/<Fe> as an alpha abundance indicator to studyrelationships between the alpha abundance distribution and galaxy propertiessuch as effective stellar velocity dispersion within 0.3 effective radii(sigma_*), galaxy environment, and dark matter halo formation time (z_f). Wefind that (1) all galaxies show a tight correlation between Mgb/<Fe> andsigma_*; (2) `old' (H_beta < 3) low-sigma_* galaxies in high local densityenvironment and inner regions within galaxy groups are enhanced in Mgb/<Fe>,while `young' (H_beta>3) galaxies and high-mass galaxies show no or lessenvironmental dependence; (3) `old' galaxies with high-z_f show enhancedMgb/<Fe> over low- and medium-z_f; (4) Mgb/<Fe> gradients are close to zero andshow dependence on sigma_* but no obvious dependence on the environment or z_f.Our study indicates that stellar velocity dispersion or galaxy mass is the mainparameter driving the Mgb/<Fe> enhancement, although environments appear tohave modest effects, particularly for low- and medium-mass galaxies.

SDSS-IV MaNGA: Environmental dependence of the Mgb/-sigma_* relation for nearby galaxies