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Home All issues Volume 670 (February 2023) A&A, 670 (2023) A21 Full HTML
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Table 1.

HCG H I sample.

HCG Nmem RA Dec cz⊙ Dist. VLA Δvchan σrms Beam Size NHI (4σ)
(deg) (deg) (km s−1) (Mpc) Config. (km s−1) (mJy beam−1) (arcsec) (cm−2)
2 3 7.87517 8.43126 4326 50 D 10.3 0.74 69.3 × 51.4 1.9 × 1019
7 4 9.84960 0.87818 4224 50 C,D 20.6 0.3 35.0 × 28.0 4.0 × 1019
10 4 21.53076 34.69095 4761 50 DnC 20.6 0.39 61.6 × 49.7 1.7 × 1019
15 6 31.91244 2.13827 7042 96 DnC 20.6 0.48 60.7 × 47.5 2.2 × 1019
16 5 32.38881 −10.16298 3977 49 C,D 20.6 0.41 38.9 × 31.7 4.3 × 1019
19 3 40.68807 −12.41181 4253 53 C,D 10.3 0.47 41.0 × 27.0 3.9 × 1019
22 4 45.88027 −15.67570 2626 37 CnB,D 20.6 0.56 50.9 × 36.8 3.9 × 1019
23 5 46.77701 −9.58547 4921 65 C 20.6 0.54 25.3 × 20.0 13.9 × 1019
25 4 50.18220 −1.05192 6343 82 DnC 20.6 0.5 65.4 × 56.6 1.7 × 1019
26 7 50.47584 −13.64586 9618 130 C 10.3 0.63 25.5 × 16.8 13.5 × 1019
30 4 69.11918 −2.83239 4645 61 DnC 20.6 0.51 57.9 × 44.8 2.6 × 1019
31 5 75.40372 −4.25671 4068 53 CnB 10.3 0.65 14.6 × 12.1 33.6 × 1019
33 4 77.69969 18.03465 7795 107 C 20.6 0.82 17.5 × 15.4 39.4 × 1019
37 5 138.39859 30.01417 6741 97 DnC 20.6 0.74 49.5 × 47.4 4.1 × 1019
38 3 141.91194 12.28081 8652 123 D 4.9 1.24 85.6 × 57.6 1.6 × 1019
40 5 144.72717 −4.85196 6628 99 DnC 20.6 0.33 58.8 × 44.8 1.6 × 1019
47 4 156.45175 13.73157 9508 136 C,D 4.9 0.49 31.0 × 20.0 5.0 × 1019
48 2 159.44020 −27.08746 2352 34 DnC 20.6 0.78 54.3 × 37.4 5.0 × 1019
49 5 164.15204 67.17920 9939 139 DnC 10.3 0.4 47.4 × 37.1 2.1 × 1019
54 5 ( * ) 172.31364 20.57852 1412 27 C 10.3 0.46 20.8 × 16.9 11.9 × 1019
56 5 173.13297 52.94860 8110 116 C,D 4.9 0.49 23.5 × 19.6 6.8 × 1019
57 8 174.46054 21.98504 9032 135 C 4.9 0.62 23.7 × 18.9 8.8 × 1019
58 5 175.54908 10.31703 6138 85 DnC,D 20.6 0.25 65.8 × 57.0 0.9 × 1019
59 4 177.10671 12.72623 4008 60 C,D 4.9 0.63 24.0 × 16.0 10.4 × 1019
61 3 183.09972 29.17781 3956 60 C 4.9 0.35 26.2 × 18.8 4.6 × 1019
62 4 193.28399 −9.22410 4239 60 C 4.9 0.62 24.8 × 14.9 10.8 × 1019
68 5 208.42036 40.32794 2401 35 D 10.3 0.68 58.3 × 54.8 2.0 × 1019
71 5 212.76906 25.48492 9199 131 C,D 4.9 0.44 26.0 × 20.0 5.4 × 1019
79 4 239.80365 20.75163 4369 59 C 10.3 0.5 20.8 × 17.4 12.5 × 1019
88 4 313.09503 −5.75790 6032 74 C 20.6 0.3 22.6 × 17.2 10.1 × 1019
90 4 330.52343 −31.96680 2635 33 DnC 41.2 0.55 49.1 × 39.9 5.1 × 1019
91 4 332.30172 −27.77593 7195 92 DnC 20.6 0.66 51.3 × 47.0 3.5 × 1019
92 4 339.00215 33.96577 6614 87 B,C,D 20.6 0.06 15.0 × 15.0 3.7 × 1019
93 4 348.85099 18.98311 5136 64 DnC 20.6 0.4 59.7 × 53.3 1.6 × 1019
95 4 349.88240 9.49185 11615 153 CnB 20.6 0.32 21.4 × 19.3 10.1 × 1019
96 4 351.99291 8.77408 8725 116 C 20.6 0.21 26.9 × 18.3 5.4 × 1019
97 5 356.86224 −2.30542 6579 85 DnC 20.6 0.44 63.2 × 49.5 1.8 × 1019
100 5 0.33654 13.13256 5461 67 DnC 20.6 0.47 58.7 × 50.5 2.1 × 1019

Notes. Columns: (1) HCG ID number, (2) number of group members considered in this work, (3 and 4) group coordinates (J2000), (5) heliocentric radial velocity (re-calculated as the mean velocity of the group members), (6) group distance calculated via the Cosmicflows-3 model (Tully et al. 2016; Kourkchi et al. 2020), which have uncertainties of ∼3 Mpc, (7) VLA configurations the target group was observed with, (8) channel width, (9) rms noise, (10) synthesised beam size, (11) 4σ column density sensitivity (over 20 km s−1). ( * )The five ‘members’ of HCG 54 are now thought to be clumps all associated with a single merging system.

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