University of Hertfordshire

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From the same journal

By the same authors

The Effect of Galaxy Interactions on Molecular Gas Properties

Research output: Contribution to journalArticle


  • Hsi-An Pan
  • Lihwai Lin
  • Bau-Ching Hsieh
  • Ting Xiao
  • Yang Gao
  • Sara L. Ellison
  • Jillian M. Scudder
  • Jorge Barrera-Ballesteros
  • Fangting Yuan
  • Amélie Saintonge
  • Christine D. Wilson
  • Ho Seong Hwang
  • Ilse De Looze
  • Yu Gao
  • Luis C. Ho
  • Angus Mok
  • Toby Brown
  • Timothy A. Davis
  • Thomas G. Williams
  • Aeree Chung
  • Harriet Parsons
  • Martin Bureau
  • Mark T. Sargent
  • Eun Jung Chung
  • Eunbin Kim
  • Tie Liu
  • Michał J. Michałowski
  • Tomoka Tosaki
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Original languageEnglish
Article number132
Number of pages1
Pages (from-to)20
JournalThe Astrophysical Journal
Journal publication date3 Dec 2018
StatePublished - 3 Dec 2018


Galaxy interactions are often accompanied by an enhanced star formation rate (SFR). Since molecular gas is essential for star formation, it is vital to establish whether, and by how much, galaxy interactions affect the molecular gas properties. We investigate the effect of interactions on global molecular gas properties by studying a sample of 58 galaxies in pairs and 154 control galaxies. Molecular gas properties are determined from observations with the JCMT, PMO, CSO telescopes, and supplemented with data from the xCOLD GASS and JINGLE surveys at $^{12}$CO(1-0) and $^{12}$CO(2-1). The SFR, gas mass ($M_\mathrm{H_{2}}$), and gas fraction ($f_{gas}$) are all enhanced in galaxies in pairs by $\sim$ 2.5 times compared to the controls matched in redshift, mass, and effective radius, while the enhancement of star formation efficiency (SFE $\equiv$ SFR/$M_{H_{2}}$) is less than a factor of 2. We also find that the enhancements in SFR, $M_{H_{2}}$ and $f_{gas}$ increase with decreasing pair separation and are larger in systems with smaller stellar mass ratio. Conversely, the SFE is only enhanced in close pairs (separation $


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