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

Abstract

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

The 13th Data Release of the Sloan Digital Sky Survey: First Spectroscopic Data from the SDSS-IV Survey Mapping Nearby Galaxies at Apache Point Observatory

“…Ibarra -Medel et al (2016) meanwhile infer spatially resolved stellar mass assembly histories for the MaNGA galaxies, extending previously known relations between galaxy type and assembly history to a larger mass range. Their findings are consistent with blue/star-forming/late-type galaxies assembling, on average, from inside to out.…”

SDSS-IV MaNGA-resolved Star Formation and Molecular Gas Properties of Green Valley Galaxies: A First Look with ALMA and MaNGA

“…Moreover, galaxies may be rejuvenated if there is fresh gas accreted when experiencing minor mergers or galaxy interactions (Thomas et al 2010;Haines et al 2015;Lacerna et al 2016) and hence may not evolve monotonically with a decreasing global sSFR. Detailed stellar population analyses regarding the star formation and stellar mass assembling histories (e.g., Ibarra-Medel et al 2016) together with resolved gas observations for a larger sample of green valley galaxies is required to confirm the picture presented in this work.…”

The Fourteenth Data Release of the Sloan Digital Sky Survey: First Spectroscopic Data from the Extended Baryon Oscillation Spectroscopic Survey and from the Second Phase of the Apache Point Observatory Galactic Evolution Experiment

“…PIPE3D is an IFU-focused analysis pipeline that calculates intermediate data products and is able to obtain both the stellar population and the ionized gas properties extracted from the data cubes in an automatic way. This pipeline is based on FIT3D, the details of which are presented in Sánchez et al (2016aSánchez et al ( , 2016b, which show some examples based on CALIFA (Cano-Díaz et al 2016;Sánchez-Menguiano et al 2016;Sánchez et al 2017b) and MaNGA/P-MaNGA (BarreraBallesteros et al 2016;Ibarra-Medel et al 2016;BarreraBallesteros et al 2017;Lin et al 2017) data sets. The MaNGA data products provided by Pipe3D are presented in Sánchez et al (2017a).…”