SDSS-IV MaNGA: Inside-out versus Outside-in Quenching of Galaxies in Different Local Environments

Journal
Date Issued
2019
Author(s)
Lin, Lihwai
•
Hsieh, Bau-Ching
•
Pan, Hsi-An
•
Rembold, Sandro B.
•
Sánchez, Sebastián F.
•
Argudo-Fernández, Maria
•
Rowlands, Kate
•
•
Bizyaev, Dmitry
•
Lacerna, Ivan
•
Riffel, Rogréio
•
Rong, Yu
•
Yuan, Fangting
•
Drory, Niv
•
Maiolino, Roberto
•
Wilcots, Eric
DOI
Abstract
The large Integral Field Spectroscopy surveys have allowed the classification of ionizing sources of emission lines on sub-kiloparsec scales. In this work, we define two non-parametric parameters, quiescence (F q ) and its concentration (C q ), to quantify the strength and the spatial distribution of the quenched areas, respectively, traced by the LI(N)ER regions with low EW(Hα). With these two measurements, we classify MaNGA galaxies into inside-out and outside-in quenching types according to their locations on the F q versus C q plane and we measure the fraction of inside-out (outside-in) quenching galaxies as a function of halo mass. We find that the fraction of galaxies showing inside-out quenching increases with halo mass, irrespective of stellar mass or galaxy type (satellites versus centrals). In addition, high-stellar-mass galaxies exhibit a greater fraction of inside-out quenching compared to low-stellar-mass ones in all environments. In contrast, the fraction of outside-in quenching does not depend on halo mass. Our results suggest that morphological quenching may be responsible for the inside-out quenching seen in all environments. On the other hand, the flat dependence of the outside-in quenching on halo mass could be a mixed result of ram pressure stripping and galaxy mergers. Nevertheless, for a given environment and stellar mass, the fraction of inside-out quenching is systematically greater than that of outside-in quenching, suggesting that inside-out quenching is the dominant quenching mode in all environments.
Volume
872
Issue
1
Start page
50
Uri
Url
Issn Identifier
0004-637X
Ads BibCode
2019ApJ...872...50L
Rights
open.access
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