Arp-Madore 1

Arp-Madore 1
Globular cluster Arp-Madore 1
Observation data (J2000.0 epoch)
ConstellationHorologium
Right ascension03h 55m 02.70s[1]
Declination−49° 36′ 52.0″[1]
Distance398,000 (122,000)
Apparent magnitude (V)15.07
Apparent dimensions (V)1.288 by 0.691 ′[1]
Physical characteristics
Other designationsE1, AM 0353-094, C 0353-497, C 0354-498, AM 1, ESO 201-10, LEDA 14098, SGC 035336-4945.6[1]
See also: Globular cluster, List of globular clusters

Arp-Madore 1 (also known as AM 1) is a globular cluster visible in the constellation Horologium, located 123.3 kiloparsecs (402,000 light-years) away from Earth.[2] It is one of the most distant known globular clusters of the Milky Way galaxy's halo;[3][4] its distance gives it interest as a test case for gravitational theories.[5] AM 1 has a visual magnitude of 15.07.[6]

It is named after Halton Arp and Barry F. Madore, who identified it as a distant globular cluster in 1979, using the UK Schmidt Telescope,[7] after previous researchers at the European Southern Observatory had observed its existence but not its classification.[8]

See also

References

  1. ^ a b c d "NAME E 1". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 29 January 2014.
  2. ^ Vasiliev, Eugene (2019). "Proper motions and dynamics of the Milky Way globular cluster system from Gaia DR2". Monthly Notices of the Royal Astronomical Society. 484 (2): 2832–2850. arXiv:1807.09775. Bibcode:2019MNRAS.484.2832V. doi:10.1093/mnras/stz171.
  3. ^ Aaronson, M.; Schommer, R. A.; Olszewski, E. W. (1984), "AM-1 : a very distant globular cluster", Astrophys. J., 276: 221–228, Bibcode:1984ApJ...276..221A, doi:10.1086/161605.
  4. ^ Dotter, A.; Sarjedini, A.; Yang, S.-C. (2008), "Globular clusters in the outer galactic halo: AM-1 and Palomar 14", Astron. J., 136 (4): 1407–1414, arXiv:0807.1103, Bibcode:2008AJ....136.1407D, doi:10.1088/0004-6256/136/4/1407, S2CID 119153331.
  5. ^ Hilker, M. (2006), "Probable member stars of the gravitational theory-testing globular clusters AM 1, Pal 3 and Pal 14", Astron. Astrophys., 448 (1): 171–180, arXiv:astro-ph/0510679, Bibcode:2006A&A...448..171H, doi:10.1051/0004-6361:20054327, S2CID 15832632.
  6. ^ "AM 1". people.smp.uq.edu.au. Retrieved 2024-05-10.
  7. ^ Madore, B. F.; Arp, H. C. (1979), "Three new faint star clusters", Astrophys. J., 227: L103 – L104, Bibcode:1979ApJ...227L.103M, doi:10.1086/182876.
  8. ^ Holmberg, E. B.; Lauberts, A.; Schuster, H. E.; West, R. M. (1975), "The ESO/Uppsala survey of the ESO (B) atlas of the southern sky. III", Astron. Astrophys., Suppl.Ser., 22: 327–402, Bibcode:1975A&AS...22..327H.