Mayall II
| Mayall II | |
|---|---|
.jpg) Hubble Telescope image of Mayall II | |
| Observation data (J2000 epoch) | |
| Constellation | Andromeda |
| Right ascension | 00h 32m 46.51s[1] |
| Declination | +39° 34′ 39.7″[1] |
| Distance | 2.52 ± 0.14 Mly (770 ± 40 kpc) |
| Apparent magnitude (V) | +13.81[1] |
| Physical characteristics | |
| Mass | 1×107[2] 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)[3] |
| Estimated age | ~ 12 Gyr[2] |
| Other designations | SKHB 1, HBK 0-1[1] |
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
[edit | edit source]- 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]
See also
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References
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External links
[edit | edit source]- Astrophysical Journal, Vol. 370, p. 495–504
- Publications of the Astronomical Society of the Pacific, Vol. 65, No. 382, p. 24–29
- Astronomical Journal, vol. 82, p. 947–953
- NightSkyInfo.com: Mayall II
| Location | Andromeda Galaxy → Andromeda subgroup → Local Group → Local Sheet → Local Volume → Virgo Supercluster → Laniakea Supercluster → Pisces–Cetus Supercluster Complex → Local Hole → Observable universe → Universe Each → may be read as "within" or "part of". | .jpg) |
|---|---|---|
| Satellite galaxies |
*It is uncertain whether these are companion galaxies of the Andromeda Galaxy | |
| Catalogued stars | ||
| Other | ||
