Arp-Madore 1

Arp-Madore 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] 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,[6] after previous researchers at the European Southern Observatory had observed its existence but not its classification.[7]

Arp-Madore 1
Globular cluster Arp-Madore 1
Credit: Fabian RRRR
Observation data (J2000.0 epoch)
ConstellationHorologium
Right ascension03h 55m 02.70s[1]
Declination−49° 36′ 52.0″[1]
Distance398,000 (122,000)
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]

References
  1. "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.
  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.
  6. 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.
  7. 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.


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