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Table 1

Pair properties.

Field Pair galaxies Redshift Stellar masses1 Mass ratio2 Flux ratio3 r p 4 Δv 5 T merg 6 z assembly 7
ID numbers z 1 1010 M⊙ h-1 kpc km s-1 Gyr
COSMOS 511001467 a&b 2.0970 0.3/0.15 2.0 1.9 ± 0.2 18.4 ± 0.3 87 2.3 1.1
510788270 a&b 2.9629 0.5/0.7 1.4 1.7 ± 0.3 15.4 ± 0.2 38 1.5 1.8
510175610/510778438 3.0939 0.8/5.0 6.3 4.2 ± 0.2 9.4 ± 0.2 161 0.7 2.3
VVDS-02h 520452183/520450423 1.8370 5.6/3.0 1.9 2.2 ± 0.1 22.3 ± 1.2 390 1.1 1.3
520478238/520478087 2.2460 2.0/1.0 2.0 1.8 ± 0.4 25.3 ± 1.2 28 1.8 1.3
910260902/910261083 2.3594 3.4/7.9 2.3 2.0 ± 0.1 12.3 ± 1.1 54 0.6 1.9
910302317/910302929 1.8171 1.1/1.8 1.6 1.4 ± 0.1 8.7 ± 1.2 181 0.6 1.5
ECDFS 530034527 a&b 3.6500 1.2/0.9 1.3 1.5 ± 0.1 6.6 ± 0.2 0 0.5 2.9
530050663 a&b 2.3250 0.4/0.2 2.0 1.9 ± 0.2 5.5 ± 0.3 54 0.6 1.9
530042814/530042840 2.9903 0.12/0.1 1.2 1.3 ± 0.1 6.0 ± 0.2 278 1.0 2.1
530046916 a&b 2.8684 1.4/0.6 2.3 2.5 ± 0.1 6.5 ± 0.2 279 0.5 2.4
530036900 a&b 3.3300 1.3/1.1 1.2 1.5 ± 0.1 7.0 ± 0.2 76 0.6 2.6

Notes. errors in Δv are estimated to be <100 km s-1 when the two redshifts are from the same slit (10 pairs), and ~200 km s-1 when redshifts are from two different slits (2 pairs);

(1)

Stellar mass estimates from SED fitting;

(2)

stellar mass ratio between the two galaxies in the pair, errors on the mass ratio have been computed from the error on the ratio of the H or K band flux measurements (see text);

(3)

flux ratio as measured on H or K-band;

(4)

rp: transverse separation between the two galaxies in the pair, errors in rp have been conservatively estimated taking a one pixel error on the difference in the centroid measurement of each galaxy in the pair;

(5)

Δv: velocity separation along the line of sight;

(6)

Tmerg: time scale for the pair to merge, using the Kitzbichler & White (2008) prescription; from errors in mass ratio, rp and Δv errors on Tmerg are ~10−20%;

(7)

zassembly: redshift by which the two galaxies will have merged, obtained combining the observed redshift and the Δz corresponding to the merger time scale.

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