2026A&A...706A..92W

Query : 2026A&A...706A..92W

2026A&A...706A..92W - Astronomy and Astrophysics, volume 706A92 (2026/2-1)

The binary ballet: Mapping local expansion around M 81 and M 82.

WAGNER J., BENISTY D. and KARACHENTSEV I.D.

Abstract (from CDS):

This study of the M 81 complex and its Hubble flow delivers new and improved tip of the red giant branch (TRGB)-based distances for nine member galaxies, yielding a total of 58 galaxies with high-precision TRGB distances. With those, we perform a systematic analysis of the group's dynamics in the core and its embedding in the local cosmic environment. Our analysis confirms that the satellite galaxies of the M 81 complex exhibit a flattened, planar distribution almost perpendicular to the supergalactic pole, and thus aligned with a larger-scale filamentary structure in the local Universe. We demonstrate that the properties of the group's barycentre are robustly constrained by the two brightest members, M 81 and M 82, and that correcting heliocentric velocities for the solar motion in the Local Group decreases the velocity dispersion of the group. Then applying minor and major infall models, we fit the local Hubble flow to constrain the Hubble constant and the total mass of the M 81 complex. The joint best-fit parameters from both models yield H0 = (63±6) km/s/Mpc and a total mass of (2.28 ± 0.49)×1012 M⊙. We thus arrive at an increased mass estimate compared to prior work but reach a higher consistency with virial ((2.74 ± 0.36)×1012 M⊙) and projected ((3.11 ± 0.69)×1012 M⊙) mass estimates. Moreover, our H0 estimate shows an agreement with Planck, consistent with other TRGB-based local-Universe inferences of H0 and still within a 2σ agreement with Cepheid-based local-Universe probes.

Abstract Copyright: © The Authors 2026

Journal keyword(s): galaxies: groups: individual: M 81 - cosmological parameters

Status at CDS : Acronym for new objects described in the dictionary of nomenclature and being created in SIMBAD. // All or part of tables of objects could be ingested in SIMBAD with priority 2.

Simbad objects: 125

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Number of rows : 125
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2026 		#notes
1 M 31 AGN 00 42 44.330 +41 16 07.50 4.86 4.36 3.44     ~ 13622 1
2 NGC 672 GiP 01 47 54.4764771528 +27 25 58.020709728 12.04 11.60 11.09 10.81   ~ 304 0
3 NAME Cas 1 G 02 06 07.9 +69 00 36     14.62     ~ 53 0
4 LEDA 2807114 G 03 44 56.7 +72 03 52           ~ 13 0
5 IC 342 AGN 03 46 48.514 +68 05 45.98   10.5       ~ 1579 1
6 UGCA 86 AG? 03 59 48.30 +67 08 18.6   14.2 14.2     ~ 110 0
7 NAME Camel Galaxy LSB 04 25 16.6 +72 48 24   14.85       ~ 59 0
8 NGC 1569 rG 04 30 49.186 +64 50 52.52 11.72 11.86 11.03     ~ 1297 3
9 NGC 1560 GiG 04 32 49.087 +71 52 59.20   12.1       ~ 264 0
10 NAME Cam B G 04 53 07.1 +67 05 57   16.71       ~ 79 0
11 Z 283-4 GiG 05 14 15.3240846648 +62 34 47.964904644   15.3       ~ 90 1
12 Mailyan 7 G 05 17 42.00 +81 37 27.0           ~ 8 0
13 LEDA 95594 G 05 59 40.4 +73 25 40   17.1       ~ 46 0
14 LEDA 95597 LSB 06 47 45.6 +80 07 27   16.4       ~ 74 0
15 NGC 2366 H2G 07 28 52.4529 +69 12 38.859 12.25 11.86 11.39 11.33   ~ 801 0
16 UGCA 133 G 07 34 11.5 +66 52 47 16.40 15.48 14.80 14.76   ~ 93 0
17 NGC 2403 AGN 07 36 51.3381434280 +65 36 09.650825640 9.31 8.84 8.38 8.19   ~ 1887 1
18 MADCASH-1 G 07 42 39.400 +65 25 00.01         23.55 ~ 16 0
19 UGC 4305 IG 08 19 04.9864630512 +70 43 13.086910452 12.06 11.72 11.39 11.11   ~ 812 2
20 NAME M 81 Dwarf A G 08 23 55.1 +71 01 56   16.5       ~ 209 1
21 Z 311-8 GiG 08 34 07.20 +66 10 54.0 15.39 15.03 14.70 14.49   ~ 357 2
22 Z 331-51 GiG 08 37 03.00 +69 46 31.0 15.70 15.46 14.98 14.89   ~ 316 0
23 [KK2022] Dw0910+7326 G 09 10 13.450 +73 26 19.15           ~ 5 0
24 Z 264-88 AG? 09 16 02.0195908968 +52 50 42.051257412   14.0 13.2     ~ 141 0
25 NGC 2787 LIN 09 19 18.6046606656 +69 12 11.630716128   12.92 11.79     ~ 381 0
26 Z 332-49 AG? 09 25 10.9152585432 +68 22 59.167851456 15.94 15.13 14.42 14.09   ~ 50 0
27 LEDA 5056943 LSB 09 26 27.9 +70 30 24           ~ 19 0
28 LEDA 5056931 G 09 34 03.7 +70 12 57           ~ 14 0
29 LEDA 5056932 LSB 09 39 15.9 +71 18 42           ~ 17 0
30 Z 332-57 LSB 09 40 32.33 +71 10 56.0 14.53 14.00 13.66 13.41   ~ 372 1
31 LEDA 5056933 G 09 44 22.5 +69 12 40           ~ 13 0
32 LEDA 5056944 G 09 44 34.4 +71 28 57           ~ 16 0
33 NAME F8D1 G 09 44 47.1 +67 26 19   14.60 13.85     ~ 80 0
34 NAME F6D1 GiG 09 45 10.0 +68 45 54   17.5       ~ 53 0
35 NGC 2976 GiG 09 47 15.458 +67 54 58.97 11.77 11.03 10.16 9.51   ~ 712 1
36 NAME F12D1 G 09 50 10.0 +67 30 24   15.6       ~ 58 1
37 LEDA 28529 G 09 53 48.8 +68 58 09   18.89       ~ 97 1
38 [BSP2022] M81-dw J0954+6821 G? 09 54 07.0 +68 21 51           ~ 4 0
39 NAME M 81-82 Group GrG 09 55 +69.1           ~ 758 0
40 LEDA 5056934 G 09 55 13.6 +70 24 29           ~ 16 0
41 M 81 Sy2 09 55 33.1726556496 +69 03 55.062505368   7.89 6.94     ~ 4725 3
42 JKB 83 LSB 09 55 49.64496 +69 19 57.4932           ~ 6 0
43 M 82 AGN 09 55 52.430 +69 40 46.93 9.61 9.30 8.41     ~ 6156 6
44 SMDG J0956142+825327 LSB 09 56 14.18 +82 53 27.3           ~ 4 0
45 LEDA 28731 G 09 57 02.7 +68 35 30   15.17       ~ 119 1
46 LEDA 5057029 G 09 57 21.2 +68 42 55           ~ 11 0
47 NAME Arp Loop G 09 57 29.0 +69 16 20           ~ 71 1
48 MCG+12-10-012 AG? 09 57 32.8632 +69 02 50.735 15.19 15.15 14.10 14.12   ~ 327 4
49 LEDA 28826 G 09 58 49.06 +66 50 53.2   16       ~ 24 0
50 [BSP2022] M81-dw J0959+6837 G? 09 59 10.3 +68 37 16           ~ 3 0
51 LEDA 5056936 G 09 59 33.1 +68 39 25           ~ 16 0
52 LEDA 2807133 GiG 10 00 16.0 +63 11 05           ~ 40 1
53 LEDA 5057030 G 10 00 40.4 +68 39 37           ~ 10 0
54 NGC 3077 GiP 10 03 19.0965510921 +68 44 01.556166166 11.23 10.85 10.14 9.74   ~ 808 0
55 NAME Garland G 10 03 43.1 +68 41 32           ~ 69 2
56 LEDA 29231 G 10 04 40.3 +68 15 20   17.43 16.72     ~ 77 0
57 UGC 5428 AG? 10 05 06.40 +66 33 32.0 17.89 16.82 16.09 15.73   ~ 113 1
58 Z 333-17 LSB 10 05 30.45024 +70 21 51.4253 15.95 15.56 15.09 14.87   ~ 214 1
59 [SBS2017] d1005+68 G 10 05 31.820 +68 14 19.56           ~ 9 0
60 LEDA 5056937 G 10 06 46.2 +67 12 04           ~ 13 0
61 UGC 5442 AG? 10 07 01.90 +67 49 39.0 17.09 15.73 15.07 14.81   ~ 95 1
62 NAME IKN G 10 08 05.9 +68 23 57           ~ 82 0
63 Z 313-5 AG? 10 12 48.017 +64 06 28.52   15.7       ~ 29 0
64 LEDA 5056938 LSB 10 14 55.8 +68 45 27           ~ 17 0
65 LEDA 5056947 LSB 10 15 06.9 +69 02 15           ~ 16 0
66 HIJASS J1021+68 G 10 21 00.2 +68 42 00           ~ 26 0
67 LEDA 4689216 GiG 10 21 25.2 +71 06 58           ~ 62 0
68 DDO 78 G 10 26 27.9 +67 39 24   15.8       ~ 88 1
69 IC 2574 AG? 10 28 23.6148831408 +68 24 43.440012756 11.70 11.07 10.87 10.74   ~ 703 1
70 LEDA 5056941 LSB 10 28 39.7 +70 14 01           ~ 20 1
71 Z 333-35 GiG 10 30 35.03 +70 37 07.2 14.81 13.69 13.01 12.73   ~ 140 0
72 LEDA 31286 G 10 34 31.9 +66 00 42   16.7       ~ 52 1
73 LEDA 5056942 G 10 41 16.8 +70 09 03           ~ 15 0
74 MCG+11-13-039 GiG 10 49 36.412 +65 32 01.07 15.55 15.27 14.79 14.55   ~ 170 0
75 LEDA 32667 LSB 10 52 55.1 +69 32 46   17.2       ~ 88 1
76 Z 351-62 bCG 11 27 59.90 +78 59 39.0   14.50       ~ 346 1
77 MCG+13-08-061 AG? 11 28 45.48 +79 36 03.0   16.5       ~ 10 0
78 Z 242-46 bCG 11 33 29.12 +49 14 17.4 14.69 14.61 14.25 14.17   ~ 242 1
79 NGC 3738 AGN 11 35 48.982 +54 31 24.70   12.12 12.04 11.56   ~ 303 0
80 NGC 3741 AG? 11 36 05.754 +45 17 02.96 15.01 14.55 14.23 14.06   ~ 237 0
81 MCG+10-17-067 AG? 11 46 59.08 +61 20 08.0   16.5       ~ 22 0
82 LEDA 166115 G 11 47 11.965 +43 40 18.79   17.5       ~ 44 1
83 Z 214-32 AG? 11 50 52.98254 +38 52 50.6594   13.72 13.9 13.39   ~ 175 0
84 SDSS J115205.58+544732.2 LSB 11 52 05.581 +54 47 32.22           ~ 7 0
85 NGC 4068 AG? 12 04 03.265 +52 35 26.05   13.29   12.77   ~ 189 0
86 NGC 4144 GiG 12 09 58.601 +46 27 25.85   12.17   11.50   ~ 260 0
87 MADCASH-2 LSB 12 10 06.740 +35 26 34.58         23.29 ~ 6 0
88 NGC 4163 LSB 12 12 09.34 +36 10 08.1 14.33 13.70 13.2 12.98   ~ 238 0
89 NGC 4190 LSB 12 13 44.765 +36 38 02.49 13.88 13.40 13.25 12.86   ~ 224 0
90 Z 315-26 AG? 12 14 08.40 +66 05 41.0   14.60       ~ 89 1
91 UGCA 276 G 12 14 57.9 +36 13 07 17.66 16.85 16.22 15.92   ~ 105 1
92 NGC 4228 SBG 12 15 39.174 +36 19 36.80 10.63 10.30 9.93 9.74   ~ 1017 1
93 Z 269-49 AG? 12 15 46.626 +52 23 13.91   15.3       ~ 75 0
94 MCG+09-20-137 LSB 12 16 30.415 +52 13 45.40   17       ~ 81 1
95 NGC 4236 GiG 12 16 42.118 +69 27 45.25 10.97 10.58 10.08 9.90   ~ 415 1
96 NGC 4244 GiG 12 17 29.659 +37 48 25.60   10.71   9.99   ~ 582 1
97 NGC 4242 GiG 12 17 30.1835103480 +45 37 09.508940220   11.37 10.83     ~ 285 1
98 M 106 Sy2 12 18 57.620 +47 18 13.39   9.14 8.41 8.11   ~ 2512 4
99 SDSS J121906.49+474348.8 LSB 12 19 06.493 +47 43 48.87     17.5   17.2 ~ 20 0
100 MCG+08-22-105 LSB 12 19 09.0802283352 +47 05 23.244084960   17       ~ 62 0
101 LEDA 166130 G 12 19 34.7 +58 02 37           ~ 10 0
102 Z 244-7 GiG 12 21 15.01 +45 48 40.8   14.8       ~ 123 2
103 LEDA 2832112 G 12 23 46.2 +47 39 32           ~ 14 0
104 Z 244-18 bCG 12 26 15.69 +48 29 38.3   15.3       ~ 364 0
105 Z 187-44 GiP 12 27 05.566 +37 08 30.39   14.19   13.55   ~ 217 0
106 Z 216-4 GiG 12 27 40.90 +43 29 44.0 13.75 13.10 12.7 12.33   ~ 270 0
107 NGC 4449 EmG 12 28 11.118 +44 05 36.81 10.11 9.98 9.64 9.45   ~ 1192 1
108 Z 187-46 GiP 12 28 28.084 +37 14 05.36   15.6       ~ 105 0
109 [HKK2009] dJ1228+4358 LSB 12 28 44.9 +43 58 18           ~ 12 0
110 Z 244-24 GiG 12 29 53.40 +47 31 52.0   14.32   13.44   ~ 84 0
111 NAME Virgo Cluster ClG 12 30 47.8 +12 23 07           ~ 7107 0
112 LEDA 41920 G 12 35 01.6 +58 23 07           ~ 12 0
113 UGCA 290 IG 12 37 21.7 +38 44 28   17       ~ 75 1
114 NGC 4605 GiG 12 39 59.2837284936 +61 36 32.822365392   10.94   10.35   ~ 347 2
115 NGC 4618 GiP 12 41 32.8976471760 +41 09 03.185175528 11.03 11.22 10.78     ~ 344 2
116 IC 3687 GiG 12 42 15.1540831512 +38 30 05.844632940   15.5       ~ 153 0
117 SDSS J124354.70+412724.9 LSB 12 43 54.708 +41 27 24.94           ~ 19 0
118 LEDA 166142 G 12 43 57.791 +43 39 40.36   17       ~ 32 0
119 SMDG J1245495+615810 LSB 12 45 49.50 +61 58 10.1           ~ 5 0
120 M 94 SyG 12 50 53.0737971432 +41 07 12.900884628 9.15 8.96 8.24 7.78   ~ 1476 2
121 SMDG J1251047+413808 LSB 12 51 04.4 +41 38 10           ~ 8 0
122 Z 316-9 AG? 13 06 24.85 +67 42 25.0 14.08 13.61 13.08 12.98   ~ 268 1
123 M 101 GiP 14 03 12.583 +54 20 55.50   8.46 7.86 7.76   ~ 3138 2
124 NGC 6789 AG? 19 16 41.169 +63 58 23.90   13.76       ~ 122 1
125 NAME Local Group GrG ~ ~           ~ 9325 0

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