An Upper Limit to the Dy Merger Rate at (z) ~ 0.55

  title={An Upper Limit to the Dy Merger Rate at (z) ~ 0.55},
  author={Roberto de Propris and Simon P. Driver and Matthew M. Colless and Michael J. Drinkwater and Nicholas Ross and J. Bland-hawthorn and Donald G. York and Kevin Pimbblet},
  • Roberto de Propris, Simon P. Driver, +5 authors Kevin Pimbblet
  • Published 2010
  • Physics
  • We measure the fraction of luminous red galaxies (LRGs) in dynamically close pairs (with projected separation less than 20 h –1 kpc and velocity difference less than 500 km s–1) to estimate the dry merger rate for galaxies with –23 < M(r) k+e,z=0.2 + 5log h < –21.5 and 0.45 < z < 0.65 in the 2dF-SDSS LRG and QSO (2SLAQ) redshift survey. For galaxies with a luminosity ratio of 1:4 or greater we determine a 5σ upper limit to the merger fraction of 1.1% and a merger rate of <0.8 × 10–5 Mpc–3 Gyr–1… CONTINUE READING

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