The growth of the central region by acquisition of counterrotating gas in star-forming galaxies - INSU - Institut national des sciences de l'Univers Access content directly
Journal Articles Nature Communications Year : 2016

The growth of the central region by acquisition of counterrotating gas in star-forming galaxies

Yan-Mei Chen
  • Function : Author
Yong Shi
  • Function : Author
Christy A. Tremonti
  • Function : Author
Matt Bershady
  • Function : Author
Michael Merrifield
  • Function : Author
Yi-Fei Jin
  • Function : Author
Song Huang
  • Function : Author
Hai Fu
  • Function : Author
David A. Wake
  • Function : Author
Kevin Bundy
  • Function : Author
David Stark
  • Function : Author
Lihwai Lin
  • Function : Author
Maria Argudo-Fernandez
  • Function : Author
Thaisa Storchi Bergmann
  • Function : Author
Dmitry Bizyaev
  • Function : Author
Joel Brownstein
  • Function : Author
Martin Bureau
  • Function : Author
John Chisholm
  • Function : Author
Niv Drory
  • Function : Author
Qi Guo
  • Function : Author
Lei Hao
  • Function : Author
Jian Hu
  • Function : Author
Cheng Li
  • Function : Author
Ran Li
  • Function : Author
Alexandre Roman Lopes
  • Function : Author
Kai-Ke Pan
  • Function : Author
Rogemar A. Riffel
  • Function : Author
Daniel Thomas
  • Function : Author
Lan Wang
  • Function : Author
Kyle Westfall
  • Function : Author
Ren-Bin Yan
  • Function : Author

Abstract

Galaxies grow through both internal and external processes. In about 10% of nearby red galaxies with little star formation, gas and stars are counter-rotating, demonstrating the importance of external gas acquisition in these galaxies. However, systematic studies of such phenomena in blue, star-forming galaxies are rare, leaving uncertain the role of external gas acquisition in driving evolution of blue galaxies. Here, based on new measurements with integral field spectroscopy of a large representative galaxy sample, we find an appreciable fraction of counter-rotators among blue galaxies (9 out of 489 galaxies). The central regions of blue counter-rotators show younger stellar populations and more intense, ongoing star formation than their outer parts, indicating ongoing growth of the central regions. The result offers observational evidence that the acquisition of external gas in blue galaxies is possible; the interaction with pre-existing gas funnels the gas into nuclear regions (<1 kpc) to form new stars.
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insu-03710566 , version 1 (01-07-2022)

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Yan-Mei Chen, Yong Shi, Christy A. Tremonti, Matt Bershady, Michael Merrifield, et al.. The growth of the central region by acquisition of counterrotating gas in star-forming galaxies. Nature Communications, 2016, 7, ⟨10.1038/ncomms13269⟩. ⟨insu-03710566⟩
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