Mayall II

Database links to Mayall II

Globular cluster Mayall II

Mayall II (surrounded by four stars in the foreground) as captured by the Hubble Space Telescope
AladinLite
Constellation	Andromeda
Position equinox : J2000.0 , epoch : J2000.0
Right ascension	00 ^h 32 ^m 46.5 ^s
declination	+ 39 ° 34 ′ 39.7 ″
Appearance
Brightness (visual)	+13.48 mag
Brightness (B-band)	+14.58 mag
Angular expansion	approx. 35 " (D ₂₅ , 25 mag isophotes)
Color excess E (BV) (redness)	0.06 mag
Physical data
Affiliation	Andromeda Galaxy
Radial velocity	−331 ± 24 km / s
distance	2.5 · 10 ⁶ years
Dimensions	1 · 10 ⁷ M _☉
Core radius	0.21 "± 0.01" (2.5 ± 0.1 light years )
Tidal radius	21.8 "± 1.1" (263 ± 13 light years )
Age	about 12 billion years
Metallicity [Fe / H]	−0.95 ± 0.09
history
discovery	Nicholas Mayall, OJ Harrows
Discovery date	1953
Catalog names
Mayall II / M II / MII, G1 / M31-G1 / NGC-224-G1, SKHB 1, HBK 0-1, GSC 2788: 2139, M31GC J003247 + 393440

Mayall II , also known as G1 , is a globular cluster in the Andromeda Galaxy .

It is located 130,000 light years from the center of the Andromeda galaxy and around 2.5 million light years from Earth. It is the ( absolutely ) brightest globular cluster in the local group . Its apparent magnitude is +13.81 mag. G1 has twice the mass of Omega Centauri .

The great metallicity and its high variability within the cluster - which indicates several generations of stars and a long-lasting star formation phase - give rise to doubts as to whether G1 is really a globular cluster or whether it is rather the center of a dwarf galaxy , whose peripheral areas are affected by the Andromeda Galaxy were consumed. In the center of the globular cluster is a black hole weighing 20,000 solar masses.

Origin of name

Mayall II is named after Nicholas Mayall and Olin Jeuck Eggen , who discovered the star cluster in 1953.

The designation SKHB 1 goes back to Wallace LW Sargent, CT Kowal, FDA Hartwick and Sidney van den Bergh, who also introduced the designation G1 ( globular cluster ) in 1977.

The name HBK 0-1 goes back to JP Huchra, JP Brodie and SM Kent (1991).

Individual evidence

↑ ^a ^b SIMBAD Astronomical Database . In: Search result for "Mayall II" . Retrieved on May 12, 2011 ..
↑ ^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: RESEARCH PAPER: Old stellar population synthesis: new age and mass estimates for Mayall II = G1 . In: Research in Astronomy and Astrophysics . 9, No. 6, June 2009, pp. 641-652. bibcode : 2009RAA ..... 9..641M . doi : 10.1088 / 1674-4527 / 9/6/003 .
↑ ^a ^b 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 .: Structural parameters of Mayall II = G1 in M31 . In: Monthly Notices of the Royal Astronomical Society . 376, No. 4, April 2007, pp. 1621-1629. arxiv : astro-ph / 0702012 . bibcode : 2007MNRAS.376.1621M . doi : 10.1111 / j.1365-2966.2007.11573.x .

[Simbad-1] SIMBAD Astronomical Database . In: Search result for "Mayall II" . Retrieved on May 12, 2011 ..

[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: RESEARCH PAPER: Old stellar population synthesis: new age and mass estimates for Mayall II = G1 . In: Research in Astronomy and Astrophysics . 9, No. 6, June 2009, pp. 641-652. bibcode : 2009RAA ..... 9..641M . doi : 10.1088 / 1674-4527 / 9/6/003 .

[Maetal2007-3] 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 .: Structural parameters of Mayall II = G1 in M31 . In: Monthly Notices of the Royal Astronomical Society . 376, No. 4, April 2007, pp. 1621-1629. arxiv : astro-ph / 0702012 . bibcode : 2007MNRAS.376.1621M . doi : 10.1111 / j.1365-2966.2007.11573.x .