Open Access

Table 1.

Major merger fractions up to z ≈ 6 from MUSE deep observations for different redshift and stellar mass intervals.

zr Np Ng fMM
[log(M)]
(1) (2) (3) (4) (5) (6)
fMajor : 7≤ log(Mprimary)≤11
0.2 ≤ z <  1 0.56 9.63 98 626
1 ≤ z <  1.5 1.26 9.41 43 352
1.5 ≤ z <  2.8 2.07 9.90 7 141
2.8 ≤ z <  4 3.46 8.57 13 332
4 ≤ z ≤ 6 5.01 7.72 14 365

fMajor : 7 ≤ log(Mprimary)< 9.5
0.2 ≤ z <  1 0.53 8.55 63 459
1 ≤ z ≤ 1.5 1.25 8.83 30 246
3 ≤ z <  4 3.47 8.23 11 265
4 ≤ z ≤ 6 5.03 7.54 10 272

fMajor : 9.5≤ log(Mprimary)≤11
0.2 ≤ z <  1 0.55 10.20 35 152
1 ≤ z <  1.5 1.27 9.73 13 98
1.5 ≤ z <  2.8 2.12 9.90 7 72
2.8 ≤ z <  4 3.49 9.63 2 70
4 ≤ z ≤ 6 4.93 10.01 4 81

fMajor : 7≤ log(Mprimary) < Mmedian(zr)≤11
0.2 ≤ z <  1 0.48 7.92 31 284
1 ≤ z ≤ 1.5 1.20 8.47 15 150
3 ≤ z <  4 3.45 7.85 5 140
4 ≤ z ≤ 6 5.10 7.48 8 141

fMajor : 7 ≤ Mmedian(zr)≤ log(Mprimary)≤11
0.2 ≤ z <  1 0.60 9.60 67 313
1 ≤ z <  1.5 1.29 9.43 28 171
1.5 ≤ z <  2.8 2.01 9.87 7 72
2.8 ≤ z <  4 3.40 8.68 8 175
4 ≤ z ≤ 6 4.80 9.37 6 197

Notes. Columns (1) and (2): range of the redshift bin and its associated mean redshift for the close pairs sample. Column (3): median value of stellar mass for the pair sample. Columns (4) and (5): number of pairs, Np, and galaxies, Ng. Column (6): major merger fraction estimates from the combined analysis of the MUSE data, corresponding to the stellar mass range indicated for the primary galaxy. The results given in this table correspond to the fractions estimated without taking into account the members of the cluster and galaxy group for the lowest-redshift bin.

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