An upper limit to the dry merger rate at
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...[Show more]
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