Sagittarius A*
Sagittarius A*, Supermassive Black hole, kwa ufupi Sgr A* ni eneo la spacetime ambapo mvuto (kani mvutano) una nguvu sana, kiasi kwamba hakuna kitu, kikiwa ni pamoja na mwanga au mawimbi mengine ya sumakuumeme, chenye nishati ya kutosha kuiepuka[1]. Inapatikana katika kiini cha galaksi ya Njia nyeupe,[2][3][4] ina shimo jeusi kubwa lenye uzito wa takriban milioni 4.3 wa jua.[5][6] Iko karibu na mpaka wa makundi ya Sagittarius na Scorpius, karibu 5.6° kusini mwa kupatwa kwa jua,[7] karibu na Butterfly Cluster (M6)[8] na Lambda Scorpii[9].
Kitu hicho ni chenye kung'aa sana, na chanzo cha redio za angani na chenye mchanganyiko mkubwa wa mahala pamoja. Jina Sagittarius A* linafuata kutokana na sababu za kihistoria. Mwaka 1954[10] John D. Kraus, Hsien-Ching Ko, na Sean Matt waliorodhesha vyanzo vya redio walivyovitambulika kwa darubini ya redio ya Chuo Kikuu cha Ohio State[11] katika 250 MHz (mawimbi ya redio). Vyanzo hivyo vilipangwa na kundi la nyota na barua waliyopewa ilikuwa holela, huku A ikiashiria chanzo cha redio angavu zaidi ndani ya kundi hilo. Asterisk ni kwa sababu ugunduzi wake ulichukuliwa kuwa "wa kusisimua"[12], sambamba na nomenclature kwa atomi za hali ya kusisimua ambazo zinaonyeshwa na asterisk (kwa mfano hali ya kusisimua ya Helium ingekuwa He*). Asterisk ilipewa (andikwa na_) na Robert L. Brown, mwaka 1982[13], ambaye alielewa kuwa uzalishaji mkubwa wa mawimbi redio kutoka katikati ya galaksi ulionekana ni kutokana na compact nonthermal radio object (kitu chenye mgandamizo mkubwa ya mawimbi redio).
Marejeo[hariri | hariri chanzo]
- ↑ Astronomers Reveal First Image of the Black Hole at the Heart of Our Galaxy (en). eventhorizontelescope.org. Iliwekwa mnamo 2022-12-13.
- ↑ Jeff Parsons (2018-10-31). Scientists find proof a black hole is lurking at the centre of our galaxy (en). Metro. Iliwekwa mnamo 2022-12-13.
- ↑ A 'mind-boggling' telescope observation has revealed the point of no return for our galaxy's monster black hole - The Middletown Press. web.archive.org (2018-10-31). Jalada kutoka ya awali juu ya 2018-10-31. Iliwekwa mnamo 2022-12-13.
- ↑ Astronomers see material orbiting a black hole *right* at the edge of forever (en-US). SYFY Official Site (2018-11-07). Iliwekwa mnamo 2022-12-13.
- ↑ Brooke Boen (2015-05-20). Supermassive Black Hole Sagittarius A*. NASA. Iliwekwa mnamo 2022-12-13.
- ↑ Revnivtsev, M. G.; Churazov, E. M.; Sazonov, S. Yu; Sunyaev, R. A.; Lutovinov, A. A.; Gilfanov, M. R.; Vikhlinin, A. A.; Shtykovsky, P. E. et al. (2004-10-01). "Hard X-ray view of the past activity of Sgr A in a natural Compton mirror" (in en). Astronomy & Astrophysics 425 (3): L49–L52. . . https://www.aanda.org/articles/aa/abs/2004/39/aagh113/aagh113.html.
- ↑ Scott MacNeill. Equatorial and Ecliptic Coordinates (en). Frosty Drew Observatory & Sky Theatre. Iliwekwa mnamo 2022-12-13.
- ↑ "Butterfly Cluster", Wikipedia (in English), 2022-12-09, retrieved 2022-12-13
- ↑ "Lambda Scorpii", Wikipedia (in English), 2022-11-28, retrieved 2022-12-13
- ↑ Kraus, J. D.; Ko, H. C.; Matt, S. (1954-12-01). "Galactic and localized source observations at 250 megacycles per second.". The Astronomical Journal 59: 439–443. . . https://ui.adsabs.harvard.edu/abs/1954AJ.....59..439K.
- ↑ "Ohio State University", Wikipedia (in English), 2022-12-09, retrieved 2022-12-13
- ↑ Goss, W. M.; Brown, Robert L.; Lo, K. Y. (2003-09). "The Discovery of Sgr A*" (in en). Astronomische Nachrichten 324 (S1): 497–504. . . https://onlinelibrary.wiley.com/doi/10.1002/asna.200385047.
- ↑ 1982ApJ...262..110B Page 110. adsabs.harvard.edu. Iliwekwa mnamo 2022-12-13.
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