Table 2.
Catalogues of compact groups from SDSS.
| McC09 |
SOHN15 | SOHNCG | HMCG | ||
|---|---|---|---|---|---|
| A | B | ||||
| Release | DR6 | DR6 | DR12+ | DR12+ | DR12+ |
| Finder | PRO | PRO | P+VF | FoF | MOD |
| rlim | 18 | 21 | 17.77 | 17.77 | 17.77 |
| rinf | 14.5 | 14.5 | – | – | – |
| μlim | 26 | 26 | 26 | 26 | 26.33 |
| Isolation | YES | YES | YES | NO | YES |
| Total | 2297 | 74 791 | 332 | 1588 | 462 |
| N ≥ 4 | 2297 | 74 788 | 192 | 312 | 462 |
| +Nz = N | 153 | 55 | 140 | 312 | 462 |
| +Δvi,cm ≤ 1000 | 44 | 13 | 140 | 312 | 462 |
| +rb ≤ 14.77 | 2 | 2 | 11 | 142 | 462 |
| +μr ≤ 26 | 2 | 2 | 11 | 142 | 383 |
| υ (103 km s−1) | – | – | 19.6(2.7) | 10.6(0.7) | 12.2(0.6) |
| rp (h−1kpc) | – | – | 40(8) | 38(2) | 73(3) |
| συ (km s−1) | – | – | 215(71) | 323(37) | 236(16) |
| ΔM12 | – | – | 1.4(0.4) | 0.8(0.1) | 1.0(0.1) |
Notes. Compact group catalogues: McC09 = McConnachie et al. (2009), SOHN15 = Sohn et al. (2015), SOHNCG = Sohn et al. (2016). Releases: the + upper sign means that the data were complemented with redshift information from different sources. Finders: PRO = in projection, P + VF = in projection plus posterior velocity filtering, FoF = friends-of-friends algorithm, MOD = modified algorithm (this work). In the middle section of the table, Nz is the number of members with spectroscopic information, while the + sign at the beginning of each row indicates that it includes the restrictions of the previous ones. In the four bottom rows, the format xx (ss) contains the median of the properties (xx) and the shift (ss) to construct an approximated 95% confidence interval, CI = xx ± ss, where 
, n is the number of objects in the sample and IQR is the interquartile range (Krzywinski & Altman 2014).
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