Terzan 7
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Globular cluster Terzan 7 |
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| Photo from the Hubble Space Telescope | |
| AladinLite | |
| Constellation | Sagittarius |
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Position equinox : J2000.0 , epoch : J2000.0 |
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| Right ascension | 19 h 17 m 43.92 s |
| declination | -34 ° 39 ′ 27.8 ″ |
| Appearance | |
| Brightness (visual) | 12.0 likes |
| Angular expansion | 7′.3 |
| Physical data | |
| distance | 75.7 kLj |
| Age | 7.5 billion years |
| history | |
| Catalog names | |
| GCl 109.1 • | |
Terzan 7 is a globular cluster in the Sagittarius dwarf galaxy that was discovered in 1968 by the astronomer Agop Terzan .
While almost all globular clusters in the Milky Way halo formed 12-15 billion years ago, Terzan 7 and a few other globular clusters, mainly belonging to the Sagittarius dwarf galaxy, are assumed to have formed significantly later. These data suggest that Terzan 7 was also created there.
Individual evidence
- ↑ Ryan Goldsbury, Harvey B. Richer, Jay Anderson, Aaron Dotter, Ata Sarajedini, Kristin Woodley: The ACS Survey of Galactic Globular Clusters. X. New Determinations of Centers for 65 Clusters The Astronomical Journal, December 2010, pp. 1830-1837.
- ↑ a b c Terzan 7 @ seds
- ↑ Doug Geisler, Gearge Wallerstein, Verne V. Smith, Dana I. Casetti-Dinescu: "Chemical Abundances and Kinematics in Globular Clusters and Local Group Dwarf Galaxies and Their Implications for Formation Theories of the Galactic Halo" in: The Publications of the Astronomical Society of the Pacific, September 2007, pp. 939-961
- ↑ Palomar 1 , Palomar 3 , Palomar 4 , Palomar 12 , Palomar 14 , Ruprecht 106 , IC 4499 , Arp 2 , Eridanus star clusters , Fornax 4
- ↑ Sidney van den Bergh : Young Globular Clusters and Dwarf Spheroidals , The Astrophysical Journal, February 2000, pp. 777-782