Sagittarius A*
| Saggitarius A* | |
|---|---|
 Saggitarius A* image by Chandra X-Ray Observatory | |
| Observation data | |
| Type | Radio source |
| Right ascension | 17h 45m 40.05s |
| Declination | ±−29° 00′ 27.9″ |
| Distance | 25900±1400 light years |
| Constellation | Saggitarius |
| Physical characteristics | |
| Notable features | Radio source in the center of the Milky Way |
| Other designations | Sgr A* |
| See also: Diffuse nebula, Lists of nebulae | |
Sagittarius A* (Sgr A*) is a bright astronomical radio source at the center of the Milky Way. It is in the direction of the constellations Sagittarius and Scorpius.
The radio source is part of a larger astronomical feature known as Sagittarius A. Sagittarius A* is thought to be a supermassive black hole,[1][2][3] like those that are at the centers of most spiral and elliptical galaxies. Observations of the star S2 in orbit around Sagittarius A* were used to show the presence of the Milky Way's central supermassive black hole. This led to the conclusion that Sagittarius A* is the site of that black hole.[4][5] Another star, S8, is orbiting Sagittarius A* along with many other stars. A star known as S14 has an extremely elliptical orbit[6]and a star named S4716 has an orbital period of only 4 years[7].
Related pages
[change | change source]References
[change | change source]- ↑ Reynolds 2008[broken anchor]
- ↑ Overbye, Dennis (8 June 2015). "Black Hole Hunters". NASA. Retrieved 8 June 2015.
- ↑ Overbye, Dennis; Corum, Jonathan; Drakeford, Jason (8 June 2015). "Video: Peering Into a Black Hole". New York Times. ISSN 0362-4331. Retrieved 9 June 2015.
- ↑ Henderson, Mark (December 9, 2008). "Astronomers confirm black hole at the heart of the Milky Way". Times Online. Retrieved 2009-05-17.
- ↑ Reynolds C. 2008. Astrophysics: bringing black holes into focus. Nature 455 (7209): 39–40. Bibcode:2008Natur.455...39R. doi:10.1038/455039a. PMID 18769426.
- ↑ "Orbital parameters of stars orbiting Sagittarius A*". Physics Forums: Science Discussion, Homework Help, Articles. 2016-03-02. Retrieved 2024-07-28.
- ↑ Sabha, N.; Eckart, A.; Merritt, D.; Zamaninasab, M.; Witzel, G.; García-Marín, M.; Jalali, B.; Valencia-S, M.; Yazici, S.; Buchholz, R.; Shahzamanian, B. (2012-09-01). "The S-star cluster at the center of the Milky Way - On the nature of diffuse NIR emission in the inner tenth of a parsec". Astronomy & Astrophysics. 545: A70. doi:10.1051/0004-6361/201219203. ISSN 0004-6361.
Other websites
[change | change source]
Media related to Sagittarius A* at Wikimedia Commons