Mayall II

Mayall II
Mayall II
	Hubble Telescope image of Mayall II
Observation data (J2000 epoch)
Constellation	Andromeda
Right ascension	00h 32m 46.51s
Declination	+39° 34′ 39.7″
Distance	2.52 ± 0.14 Mly (770 ± 40 kpc)
Apparent magnitude (V)	+13.81
Physical characteristics
Mass	1×107 M☉ (2×1037 kg)
Radius	21.2 ± 1.0 ly (6.5 ± 0.3 pc) (Half light radius rh) and tidal radius 263.2 ± 12.7 ly (80.7 ± 3.9 pc)
Estimated age	~ 12 Gyr
Other designations	SKHB 1, HBK 0-1
	See also: Globular cluster, List of globular clusters

Mayall II, also known as NGC-224-G1, SKHB 1, GSC 2788:2139, HBK 0-1, M31GC J003247+393440 or Andromeda's Cluster, is a globular cluster orbiting M31, the Andromeda Galaxy.

It is located 130,000 light-years (40 kpc)^[3] from the Andromeda Galaxy's galactic core, and is the brightest^[3] (by absolute magnitude) globular cluster in the Local Group, with an absolute visual magnitude of −10.94 and the luminosity of 2 million Suns.^[4] It has an apparent magnitude of 13.81 in V band. Mayall II is considered to have twice the mass of Omega Centauri, and may contain a central, intermediate-mass (~ 2×10⁴ M_⊙) black hole.^[3]

It was first identified as a possible globular cluster by American astronomers Nicholas Mayall and Olin J. Eggen in 1953 using a Palomar 48-inch (1.2 m) Schmidt plate exposed in 1948.^[3]

Because of the widespread distribution of metallicity, indicating multiple star generations and a large stellar creation period, many contend that it is not a true globular cluster, but is actually the galactic core that remains of a dwarf galaxy consumed by Andromeda.^[3]^[5]

Origin of names

Mayall II is named after Nicholas U. Mayall, who, with Olin J. Eggen, discovered it in 1953.
SKHB 1 is named for Wallace L. W. Sargent, Charles T. Kowal, F. D. A. Hartwick and Sidney van den Bergh. They also named it G1 in 1977.
HBK 0-1 is named for John Huchra, J. P. Brodie and S. M. Kent in 1991.^[4]

References

^ ^a ^b ^c ^d "NAME Mayall II". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2009-09-13.
^ ^a ^b Ma, Jun; de Grijs, Richard; Fan, Zhou; Rey, Soo-Chang; Wu, Zhen-Yu; Zhou, Xu; Wu, Jiang-Hua; Jiang, Zhao-Ji; Chen, Jian-Sheng; Lee, Kyungsook; Sohn, Sangmo Tony (June 2009). "RESEARCH PAPER: Old stellar population synthesis: new age and mass estimates for Mayall II = G1". Research in Astronomy and Astrophysics. 9 (6): 641–652. arXiv:0904.0674. Bibcode:2009RAA.....9..641M. doi:10.1088/1674-4527/9/6/003. S2CID 16360116.
^ ^a ^b ^c ^d ^e ^f Ma, J.; de Grijs, R.; Chen, D.; van den Bergh, S.; Fan, Z.; Wu, Z.; Wu, H.; Zhou, X.; Wu, J.; Jiang, Z.; Chen, J. (April 2007). "Structural parameters of Mayall II = G1 in M31". Monthly Notices of the Royal Astronomical Society. 376 (4): 1621–1629. arXiv:astro-ph/0702012. Bibcode:2007MNRAS.376.1621M. doi:10.1111/j.1365-2966.2007.11573.x. S2CID 3591548.
^ ^a ^b admin (2021-01-31). "Mayall II". Messier Objects. Retrieved 2024-05-10.
^ Meylan, G.; Sarajedini, A.; Jablonka, P.; Djorgovski, S. G.; Bridges, T.; Rich, R. M. (August 2001). "Mayall II=G1 in M31: Giant Globular Cluster or Core of a Dwarf Elliptical Galaxy?". The Astronomical Journal. 122 (2): 830–841. arXiv:astro-ph/0105013. Bibcode:2001AJ....122..830M. doi:10.1086/321166. S2CID 17778865.

External links

[simbad-1] "NAME Mayall II". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2009-09-13.

[Maetal2009-2] Ma, Jun; de Grijs, Richard; Fan, Zhou; Rey, Soo-Chang; Wu, Zhen-Yu; Zhou, Xu; Wu, Jiang-Hua; Jiang, Zhao-Ji; Chen, Jian-Sheng; Lee, Kyungsook; Sohn, Sangmo Tony (June 2009). "RESEARCH PAPER: Old stellar population synthesis: new age and mass estimates for Mayall II = G1". Research in Astronomy and Astrophysics. 9 (6): 641–652. arXiv:0904.0674. Bibcode:2009RAA.....9..641M. doi:10.1088/1674-4527/9/6/003. S2CID 16360116.

[Maetal2007-3] ^ ^a ^b ^c ^d ^e ^f Ma, J.; de Grijs, R.; Chen, D.; van den Bergh, S.; Fan, Z.; Wu, Z.; Wu, H.; Zhou, X.; Wu, J.; Jiang, Z.; Chen, J. (April 2007). "Structural parameters of Mayall II = G1 in M31". Monthly Notices of the Royal Astronomical Society. 376 (4): 1621–1629. arXiv:astro-ph/0702012. Bibcode:2007MNRAS.376.1621M. doi:10.1111/j.1365-2966.2007.11573.x. S2CID 3591548.

[:0-4] (2021-01-31). "Mayall II". Messier Objects. Retrieved 2024-05-10.

[Meylanetal2001-5] Meylan, G.; Sarajedini, A.; Jablonka, P.; Djorgovski, S. G.; Bridges, T.; Rich, R. M. (August 2001). "Mayall II=G1 in M31: Giant Globular Cluster or Core of a Dwarf Elliptical Galaxy?". The Astronomical Journal. 122 (2): 830–841. arXiv:astro-ph/0105013. Bibcode:2001AJ....122..830M. doi:10.1086/321166. S2CID 17778865.

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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

Origin of names

See also

References

External links