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Table 5

Summary of the samples used in the photometric and spectroscopic studies.

Number of entries Definition of the sample

1050 CIG galaxies in the original catalogue (Karachentseva 1973)
799 CIG galaxies found in the photometric catalogue of the SDSS-DR9
789 CIG galaxies out of 799, after deleting 10 galaxies with unreliable photometric data from the SDSS-DR9
693 CIG galaxies out of 789, after deleting 96 galaxies with ν< 1500 km s-1
636 CIG galaxies out of 693, after deleting 57 galaxies with a field radius of 1 Mpc not covered in the photometric
SDSS-DR9 catalogue
411 CIG galaxies out of 636 of which more than 80% have extended neighbours down to mr < 17.7 mag that lie within
a projected separation of 1 Mpc from the CIG galaxy with a measured redshift

86 CIG galaxies out of 636 without neighbours that violate Eqs. (1) and (2) within 1 Mpc
117 CIG galaxies out of 636 without neighbours that violate Eqs. (1) and (2) within 1 Mpc
433 CIG galaxies out of 636 with more than one neighbour that violate Eqs. (1) and (2) within 1 Mpc
550 CIG galaxies out of 636 (117 + 433), with neighbours that violate Eqs. (1) and (2) within 1 Mpc
231 CIG galaxies out of 636 without neighbours that violate Eq. (2) and for which, additionally, the approximate factor 4
in size was replaced in Eq. (1) by a factor 3 in magnitude within 1 Mpc

433 CIG galaxies out of 550 with a tidal strength QKar,p < − 2
340 CIG galaxies out of 550 with a tidal strength QKar,p < − 2 and a local number density ηk,p < 2.7
426 CIG galaxies out of 636 (86 + 340) without neighbours that violate Eqs. (1) and (2) within 1 Mpc
and with tidal strength QKar,p < − 2 and local number density ηk,p < 2.7

347 CIG galaxies out of 411 without neighbours that violate Eqs. (1) and (2), and with |Δ ν| ≤ 500 km s-1 within 1 Mpc
105 CIG galaxies out of 411 without neighbours with |Δ ν| ≤ 500 km s-1 within 1 Mpc
308 CIG galaxies out of 411 with at least one neighbour with |Δ ν| ≤ 500 km s-1 within 1 Mpc

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