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

Lihwai Lin, Bau Ching Hsieh, Hsi An Pan, Sandro B. Rembold, Sebastián F. Sánchez, MARIA DEL CARMEN ARGUDO FERNANDEZ, Kate Rowlands, Francesco Belfiore, Dmitry Bizyaev, Ivan Lacerna, Rogréio Riffel, Yu Rong, Fangting Yuan, Niv Drory, Roberto Maiolino, Eric Wilcots

Research output: Contribution to journalArticlepeer-review

17 Scopus citations

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.

Original languageEnglish
Article numberA50
JournalAstrophysical Journal
Volume872
Issue number1
DOIs
StatePublished - 10 Feb 2019
Externally publishedYes

Keywords

  • galaxies: evolution
  • galaxies: general
  • galaxies: star formation

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