SDSS IV MaNGA: the global and local stellar mass assemby histories of galaxies

• DOI: 10.1093/mnras/stw2126
• Publication Date: 2016-10-01T00:07:24Z
• Authors: Héctor J. Ibarra-...; Sebastián F. Sánchez; Vladimir Avila-Reese; Héctor M. Hernánd...; J. Jesús González; Niv Drory; Kevin Bundy; Dmitry Bizyaev; Mariana Cano-Díaz; Elena Malanushenko; Kaike Pan; Alexandre Roman-L...; Daniel Thomas
• Keywords: Stellar mass

By means of the fossil record method implemented through Pipe3D, we reconstruct global and radial stellar mass growth histories (MGHs) an unprecedentedly large sample galaxies, ranging from dwarf to giant objects, "Mapping Nearby Galaxies at Apache Point Observatory" survey. We confirm that main driver MGHs is mass, with more massive galaxies assembling their masses earlier (downsizing), though for a given segregate by color, specific star formation rate (sSFR), morphological type. From inferred mean MGHs, find late evolutionary stages (or fractions assembled larger than ~ 80%), innermost regions formed stars on average outermost ones (inside-out). At epochs, when age resolution becomes poor, assembly seems be spatially homogeneous or even in outside-in mode, specially red/quiescent/early-type galaxies. The are general regular (less scatter around mean) ones. For low-mass do not evidence mode; instead very diverse most time, periods outside- inside-out modes strong migration), suggesting this episodic SF history. Blue/star-forming/late-type present significantly pronounced mode independently mass. discuss our results light processes galaxy formation, quenching, migration. also uncertainties biases how they could affect results.