Sagittarius A*
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Sgr A*.
Sagittarius A* (okunuşu; "Sagittarius A-yıldız", standard kısaltma; Sgr A*) Samanyolu Galaksisi'nin merkezinde yer alan parlak ve çok yoğun bir astronomik radyo kaynağıdır. Sagittarius ve Scorpius takımyıldızlarının sınırının yanında yer alır. Sagittarius A'nın bir parçasıdır. Sagittarius A* nın bir süper kütleli kara delik yeri olabileceği düşünülmektedir. Sagittarius A* etrafındaki yörüngede bulunan S2 yıldızının gözlemleri sonucu Samanyolu Galaksisi'nin merkezinde bir süper kütleli kara delik bulunduğu ve Sagittarius A* nın da burada olduğu sonucuna varılmıştır.[1]
Notlar
- ↑ Henderson, Mark (December 9, 2008). "Astronomers confirm black hole at the heart of the Milky Way". Times Online. http://www.timesonline.co.uk/tol/news/uk/science/article5316001.ece. Erişim tarihi: 2009-05-17.
Kaynaklar
- Backer, D. C. and Sramek, R. A. (20 October 1999). "Proper Motion of the Compact, Nonthermal Radio Source in the Galactic Center, Sagittarius A*". The Astrophysical Journal 524 (2): 805–815. Bibcode 1999ApJ...524..805B. DOI:10.1086/307857.
- Doeleman, Sheperd; et al. (4 September 2008). "Event-horizon-scale structure in the supermassive black hole candidate at the Galactic Centre". Nature 455 (7209): 78–80. Bibcode 2008Natur.455...78D. DOI:10.1038/nature07245. PMID 18769434.
- Eckart, A.; Schödel, R.; Straubmeier, C. (2005). The Black Hole at the Center of the Milky Way. London: Imperial College Press.
- Eisenhauer, F.; et al. (23 October 2003). "A Geometric Determination of the Distance to the Galactic Center". The Astrophysical Journal 597 (2): L121–L124. arXiv:astro-ph/0306220. Bibcode 2003ApJ...597L.121E. DOI:10.1086/380188.
- Ghez, A. M.; et al. (12 March 2003). "The First Measurement of Spectral Lines in a Short-Period Star Bound to the Galaxy’s Central Black Hole: A Paradox of Youth". The Astrophysical Journal 586 (2): L127–L131. Bibcode 2003ApJ...586L.127G. DOI:10.1086/374804.
- Ghez, A. M.; et al. (December 2008). "Measuring Distance and Properties of the Milky Way's Central Supermassive Black Hole with Stellar Orbits". Astrophysical Journal 689 (2): 1044–1062. arXiv:0808.2870. Bibcode 2008ApJ...689.1044G. DOI:10.1086/592738.
- Gillessen, Stefan; et al. (23 February 2009). "Monitoring stellar orbits around the Massive Black Hole in the Galactic Center". The Astrophysical Journal 692 (2): 1075–1109. Bibcode 2009ApJ...692.1075G. DOI:10.1088/0004-637X/692/2/1075.
- Melia, Fulvio (2007). The Galactic Supermassive Black Hole. Princeton: Princeton University Press. ISBN 0-691-13129-5.
- O'Neill, Ian (10 December 2008). "Beyond Any Reasonable Doubt: A Supermassive Black Hole Lives in Centre of Our Galaxy". Universe Today. http://www.universetoday.com/2008/12/10/beyond-any-reasonable-doubt-a-supermassive-black-hole-lives-in-centre-of-our-galaxy/.
- Osterbrock, Donald E. and Ferland, Gary J. (2006). Astrophysics of Gaseous Nebulae and Active Galactic Nuclei (2nd bas.). University Science Books. ISBN 1-891389-34-3.
- Reid, M.J.; Brunthaler, A. (2004). "Sgr A* -- Radio-source". Astrophysical Journal 616: 872–884. Bibcode 2004ApJ...616..872R. http://simbad.u-strasbg.fr/simbad/sim-id?Ident=SGR+A*&NbIdent=1.
- Reynolds, C. (4 September 2008). "Astrophysics: Bringing black holes into focus". Nature 455 (7209): 39–40. Bibcode 2008Natur.455...39R. DOI:10.1038/455039a. PMID 18769426.
- Schödel, R.; et al. (17 October 2002). "A star in a 15.2-year orbit around the supermassive black hole at the centre of the Milky Way". Nature 419 (6908): 694–696. Bibcode 2002Natur.419..694S. DOI:10.1038/nature01121. PMID 12384690.
- Schödel, R.; Merritt, D.; Eckart, A. (July 2009). "The nuclear star cluster of the Milky Way: Proper motions and mass". Astronomy and Astrophysics 502 (1): 91–111. Bibcode 2009A&A...502...91S. DOI:10.1051/0004-6361/200810922.
- Wheeler, J. Craig (2007). Cosmic Catastrophes: Exploding Stars, Black Holes, and Mapping the Universe (2nd bas.). Cambridge, UK: Cambridge University Press. ISBN 0-521-85714-7.
Dış bağlantılar
- UCLA Faculty Research presentation on Sagittarius A* (Video)
- UCLA Galactic Center Group - latest results retrieved 8/12/2009
- Is there a Supermassive Black Hole at the Center of the Milky Way? (arxiv preprint)
- 2004 paper deducing mass of central black hole from orbits of 7 stars (arxiv preprint)
- ESO video clip of orbiting star (533 KB MPEG Video)
- Star Orbiting Massive Milky Way Centre Approaches to within 17 Light-Hours ESO Press Release, October 16, 2002
- Max Planck page on the galactic center, with animation
- The Proper Motion of Sgr A* and the Mass of Sgr A* (PDF)
- NRAO article regarding VLBI radio imaging of Sgr A*
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