M32p

M32p
M32p
Observation data
Group or cluster	Local Group
Characteristics
Mass	2.5×1010 M☉

M32p is a hypothesized former galaxy that was incorporated into the Andromeda Galaxy. It was a sister galaxy to the Milky Way and Andromeda galaxies, previously the third or fourth largest galaxy in the Local Group, and was merged into the larger Andromeda Galaxy an estimated 2 billion years ago.^[1] The merger is thought to have created the thick disc and contributed the majority of the halo stars of Andromeda and caused its burst of star formation at the time of the merger. The former galaxy may be associated with the Andromeda satellite galaxy Messier 32 (M32), which may be the remains of its dense core. M32's unusual characteristics of dense compactness and burst of star formation 2 billion years ago would be explained by this theory as a remnant of an earlier large galaxy, given its unlikeness to other similarly sized elliptical galaxies.^[2]

It was described in 2018 by scientists at the University of Michigan. It is thought to have had the stellar mass of around 2.5×10¹⁰ M_☉.^[3]

References

^ Mike Wall (23 July 2018). "The Milky Way Had a Big Sibling Long Ago — And Andromeda Ate It". Space.com.
^ "The Milky Way's long-lost sibling finally found". Science Daily. 23 July 2018.
^ d'Souza, Richard; Bell, Eric F (2018). "The Andromeda galaxy's most important merger about 2 billion years ago as M32's likely progenitor". Nature Astronomy. 2 (9): 737–743. arXiv:1807.08819. Bibcode:2018NatAs...2..737D. doi:10.1038/s41550-018-0533-x. S2CID 256713163.

Hammer, F.; Yang, Y. B.; Wang, J. L.; Ibata, R.; Flores, H.; Puech, M. (April 2018). "A 2-3 billion year old major merger paradigm for the Andromeda galaxy and its outskirts". Monthly Notices of the Royal Astronomical Society. 475 (2): 2754–2767. arXiv:1801.04279. Bibcode:2018MNRAS.475.2754H. doi:10.1093/mnras/stx3343.

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[Space-2018-07-23-1] Mike Wall (23 July 2018). "The Milky Way Had a Big Sibling Long Ago — And Andromeda Ate It". Space.com.

[ScienceDaily-2018-07-23-2] "The Milky Way's long-lost sibling finally found". Science Daily. 23 July 2018.

[10.1038/s41550-018-0533-x-3] 'Souza, Richard; Bell, Eric F (2018). "The Andromeda galaxy's most important merger about 2 billion years ago as M32's likely progenitor". Nature Astronomy. 2 (9): 737–743. arXiv:1807.08819. Bibcode:2018NatAs...2..737D. doi:10.1038/s41550-018-0533-x. S2CID 256713163.

[1]

[2]

[3]

v t e Andromeda Galaxy
Location	Andromeda Galaxy → Andromeda subgroup → Local Group → Local Sheet → Virgo Supercluster → Laniakea Supercluster → Local Hole → Observable universe → Universe Each → may be read as "within" or "part of".	Andromeda Galaxy
Satellite galaxies	M32 M110 NGC 185 NGC 147 Andromeda I Andromeda II Andromeda III Andromeda IV* Andromeda V Andromeda VI Andromeda VII Andromeda VIII Andromeda IX Andromeda X Andromeda XI Andromeda XII Andromeda XIII Andromeda XIV Andromeda XV Andromeda XVI Andromeda XVII Andromeda XVIII Andromeda XIX Andromeda XX Andromeda XXI Andromeda XXII Andromeda XXIII Andromeda XXIV Andromeda XXV Andromeda XXVI Andromeda XXVII Andromeda XXVIII Andromeda XXIX Triangulum subgroup* *It is uncertain whether these are companion galaxies of the Andromeda Galaxy
Catalogued stars	AE Andromedae AF Andromedae M31-RV
Other	Andromeda–Milky Way collision S Andromedae Mayall II M32p NGC 206 3XMM J004232.1+411314
Category

M32p

See also

References

Further reading