Mayall II
| Mayall II | |
|---|---|
.jpg)
Hubble Telescope image of Mayall II, colour picture assembled from separate images taken in visible and near-infrared wavelengths in July 1994.
Credit: Michael Rich, Kenneth Mighell, and James D. Neill (Columbia University), and Wendy Freedman (Carnegie Observatories) and NASA |
|
| 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) | +13.8[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)[3] |
| Estimated age | ~ 12 Gyr [2] |
| Other designations | SKHB 1, HBK 0-1[1] |
Mayall II (M31 G1) 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 Andromeda's galactic core, and is the brightest[3] (absolute magnitude) globular cluster in the Local Group, having an apparent magnitude of 13.7. G1 is considered to have twice the mass of Omega Centauri. G1 may contain a central, intermediate-mass (∼ 2×104 M⊙) black hole.[3]
It was first identified as a possible globular cluster by Nicholas Mayall & O.J. Eggen in 1953 using a Palomar 48-inch 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][4]
Origin of names
- Mayall II is named after Nicholas U. Mayall, who, with O.J. Eggen, discovered it in 1953.
- SKHB 1 is named for Wallace L. W. Sargent, C.T. Kowal, F.D.A. Hartwick, and Sidney van den Bergh. They also named it G1 in 1977.
- HBK 0-1 is named for J.P. Huchra, J.P. Brodie, and S.M. Kent in 1991.
See also
- Messier 54
- Omega Centauri
- Mayall III (M31 G2, G2, HBK 0-2, SKHB 2, M31GC J003334+393119)
- Mayall IV (HBK 358-219, SKHB 219, Bol 358, M31GC J004318+394914)
- Mayall V (HBK 407-352, SKHB 352, Bol 407, M31GC J005010+414101)
- Mayall VI (HBK 0-327, SKHB 327, BA 3-29, M31GC J004650+424445)
- Mayall's Object (Arp 148 or APG 148, VV32)
References
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- 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 → Virgo Supercluster → Laniakea Supercluster → Observable universe → Universe
Each → may be read as "within" or "part of". |
.jpg) |
|---|---|---|
| Satellite galaxies |
*It is uncertain whether the Triangulum Galaxy is a companion galaxy of the Andromeda Galaxy |
|
| Other | ||
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