| Local Group | … |
|---|---|
| Local Group of galaxies, including the massive members Messier 31 (Andromeda Galaxy) and Milky Way, as well as other nearby galaxies. The center of the group is located between the two major galaxies. | … |
| Observation data (Epoch J2000) | … |
| Constellation | Andromeda (barycenter)1 |
| Brightest member | Andromeda Galaxy2 |
| Number of galaxies | 134+1 |
| Parent structure | Local Sheet3 |
| Major axis | 16.7 Mly (5.11 Mpc)3 |
| Minor axis | 329,000 ly (101 kpc)4 |
| Velocity dispersion | 49 km/s5 |
| Distance | 1,458,000 ± 84,800 ly (447 ± 26 kpc) (barycenter)1 |
| ICM temperature | (2–3)×10 K6 |
| Binding mass | (2.47±0.15)×101 M |
| Other designations | … |
| Local Galactic Group, Local group of galaxies, LG, [FWB89] GrG 2827 | … |
| References: SIMBAD | … |
(echo:: @ ᯤ)
Footnotes
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Makarov, Danila; Makarov, Dmitry; Makarova, Lidia; Libeskind, Noam (2025). “The frozen outskirts: A cold Hubble flow and the mass of the Local Group”. Astronomy & Astrophysics. 698: A178. arXiv:2505.06642. Bibcode:2025A&A…698A.178M. doi:10.1051/0004-6361/202554778. ↩ ↩2 ↩3 ↩4
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Theuns, Tom. “Galaxy population”. Institute for Computational Cosmology. Durham University. ↩
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McCall, Marshall L. (29 April 2013). “A Council of Giants”. Monthly Notices of the Royal Astronomical Society. 440 (1) (published 10 March 2014): 405–426. arXiv:1403.3667. Bibcode:2014MNRAS.440..405M. doi:10.1093/mnras/stu199. ↩ ↩2
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Banik, Indranil; Zhao, Hongsheng (2018). “A plane of high-velocity galaxies across the Local Group”. Monthly Notices of the Royal Astronomical Society. 473 (3): 4033–4054. arXiv:1701.06559. doi:10.1093/mnras/stx2596. ↩
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Elahi, Pascal J.; Power, Chris; Lagos, Claudia del P.; Poulton, Rhys; Robotham, Aaron S G. (2018). “Using velocity dispersion to estimate halo mass: Is the Local Group in tension with ΛCDM?”. Monthly Notices of the Royal Astronomical Society. 477: 616–623. arXiv:1712.01989. doi:10.1093/mnras/sty590. ↩
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Maloney, Philip R.; Bland-Hawthorn, J. (1999). “Warm Gas and Ionizing Photons in the Local Group”. The Astrophysical Journal. 522 (2): L81–L84. arXiv:astro-ph/9907197. Bibcode:1999ApJ…522L..81M. doi:10.1086/312223. ↩
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