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SDSS-IV MaNGA: Properties of galaxies with kinematically decoupled stellar and gaseous components

Research output: Contribution to journalArticle

  • Yifei Jin
  • Yanmei Chen
  • Yong Shi
  • C. A. Tremonti
  • M. A. Bershady
  • M. Merrifield
  • E. Emsellem
  • Hai Fu
  • D. Wake
  • K. Bundy
  • Lihwai Lin
  • M. Argudo-Fernandez
  • Song Huang
  • D. V. Stark
  • T. Storchi-Bergmann
  • D. Bizyaev
  • J. Brownstein
  • J. Chisholm
  • Qi Guo
  • Lei Hao
  • Jian Hu
  • Cheng Li
  • Ran Li
  • K. L. Masters
  • E. Malanushenko
  • Kaike Pan
  • R. A. Riffel
  • A. Roman-Lopes
  • A. Simmons
  • Lan Wang
  • K. Westfall
  • Renbin Yan
We study the properties of 66 galaxies with kinematically misaligned gas and stars from MaNGA survey. The fraction of kinematically misaligned galaxies varies with galaxy physical parameters, i.e. M*, SFR and sSFR. According to their sSFR, we further classify these 66 galaxies into three categories, 10 star-forming, 26 "Green Valley" and 30 quiescent ones. The properties of different types of kinematically misaligned galaxies are different in that the star-forming ones have positive gradient in D4000 and higher gas-phase metallicity, while the green valley/quiescent ones have negative D4000 gradients and lower gas-phase metallicity on average. There is evidence that all types of the kinematically misaligned galaxies tend to live in more isolated environment. Based on all these observational results, we propose a scenario for the formation of star forming galaxies with kinematically misaligned gas and stars - the progenitor accretes misaligned gas from a gas-rich dwarf or cosmic web, the cancellation of angular momentum from gas-gas collisions between the pre-existing gas and the accreted gas largely accelerates gas inflow, leading to fast centrally-concentrated star-formation. The higher metallicity is due to enrichment from this star formation. For the kinematically misaligned green valley and quiescent galaxies, they might be formed through gas-poor progenitors accreting kinematically misaligned gas from satellites which are smaller in mass.
Original languageEnglish
Pages (from-to)913-926
JournalMonthly Notices of the Royal Astronomical Society
Volume463
Issue number1
Early online date17 Aug 2016
DOIs
Publication statusPublished - 21 Nov 2016

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  • SDSS-IV MaNGA

    Rights statement: This article has been accepted for publication in Monthly Notices of the Royal Astronomical Society ©: 2016 The Authors. Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved.

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