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

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

Using the fossil record method implemented through Pipe3D, we reconstruct the global and radial stellar mass growth histories (MGHs) of a large sample of galaxies, ranging from dwarf to giant objects, from the Mapping Nearby Galaxies at the Apache Point Observatory (MaNGA) survey. We confirm that th...

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Bibliographic Details
Published in:Monthly notices of the Royal Astronomical Society 2016-12, Vol.463 (3), p.2799-2799
Main Authors: Ibarra-Medel, Hector J, Sanchez, Sebastian F, Avila-Reese, Vladimir, Hernandez-Toledo, Hector M, Gonzalez, J Jesus, Drory, Niv, Bundy, Kevin, Bizyaev, Dmitry, Cano-Diaz, Mariana, Malanushenko, Elena, Pan, Kaike, Roman-Lopes, Alexandre, Thomas, Daniel
Format: Article
Language:eng
Subjects:
Dwarf galaxies
Formations
Fossils
Galaxies
Migration
Quenching
Space telescopes
Spectrum analysis
Star & galaxy formation
Star formation
Stellar mass
Ultraviolet radiation
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Summary:Using the fossil record method implemented through Pipe3D, we reconstruct the global and radial stellar mass growth histories (MGHs) of a large sample of galaxies, ranging from dwarf to giant objects, from the Mapping Nearby Galaxies at the Apache Point Observatory (MaNGA) survey. We confirm that the main driver of the global MGHs is mass, with more massive galaxies assembling earlier (downsizing), though for a given mass, the global MGHs segregate by colour, specific star formation rate and morphological type. From the inferred radial mean MGHs, we find that at fractions of assembled mass larger than ~80 per cent, the innermost regions formed stars, on average, in the inside-out mode. At earlier epochs, when the age estimation of the method becomes poor, the MGHs seem to be spatially homogeneous or even in the outside-in mode, especially for the red/quiescent/early-type galaxies. The innermost MGHs are, in general, less scattered around the mean than the outermost MGHs. 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 is an episodic star formation 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 also discuss the uncertainties and biases of the fossil record method and how these could affect our results.
ISSN:0035-8711
1365-2966