Galaxy merger histories and the role of merging in driving star formation at z > 1

We use Horizon-AGN, a hydrodynamical cosmological simulation, to explore the role of mergers in the evolution of massive (M∗ > 10 10 M⊙) galaxies around the epoch of peak cosmic star formation (1 3 are ‘blue’ (i.e. have significant associated star formation), the proportion of ‘red’ mergers increases rapidly at z < 2, with most merging systems at z � 1.5 producing remnants that are red in rest-frame UV-optical colours. The star formation enhancement during major mergers is mild (�20-40%) which, together with the low incidence of such events, implies that this process is not a significant driver of early stellar mass growth. Mergers (R < 10 : 1) host around a quarter of the total star formation budget in this redshift range, with major mergers hosting around two-thirds

• Publication year

  2014

• Venue

  Monthly Notices of the Royal Astronomical Society

• Publication date

  2014-11-10

• Fields of study

  Physics

• Identifiers
  DOI 10.1093/mnras/stv1500arXiv 1411.2595
• External record

  Open on Semantic Scholar

• Source metadata

  Semantic Scholar

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• No concepts are published for this paper.

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