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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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