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#1 |
Bannato
Iscritto dal: Aug 2001
Città: Berghem Haven
Messaggi: 13513
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E anche i buchi neri supermassivi succhiano :D
Sgamati
![]() http://www.universetoday.com/2008/09...les-both-suck/ Sorry, couldn't resist that title. Astronomers studying black holes are able to "see" them due to the fact that the gas getting sucked in gets extremely hot and emits X-rays. These X-ray pulses are commonly seen among smaller black holes, but until now, had not been detected from super-massive black holes. But astronomers using the XMM Newton X-ray satellite have discovered a strong X-ray pulse emitting from a giant black hole in a galaxy 500 million light years from Earth, created by gas being sucked in by gravity. "Scientists have been looking for such behaviour for the past 20 years and our discovery helps us begin to understand more about the activity around such black holes as they grow," said Dr. Marek Gierlinski from Durham University. Gierlinski and his colleagues say this finding is the "missing link" between small and super-massive black holes. The astronomers were looking at the center of the galaxy REJ1034+396 galaxy and found that X-rays are being emitted as a regular signal from the super-massive black hole. They say the frequency of the pulse is related to the size of the black hole. "Such signals are a well known feature of smaller black holes in our Galaxy when gas is pulled from a companion star," said Gierlinski. "The really interesting thing is that we have now established a link between these light-weight black holes and those millions of times as heavy as our Sun." The scientists hope future research will tell them why some super-massive black holes show this behavior while others do not. Most galaxies, including the Milky Way, are believed to contain super-massive black holes at their centers. The researchers, who publish their findings in the journal Nature on September 18, say their discovery will increase the understanding of how gas behaves before falling on to a black hole as it feeds and develops. |
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#2 |
Senior Member
Iscritto dal: Jul 2001
Messaggi: 229
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Cosa ti aspettavi che facesse?
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#3 |
Senior Member
Iscritto dal: Jul 2001
Messaggi: 229
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La differenza e che lo fanno molto piu lentamente ciò e dovuto al loro enorme volume la forza di attrazione non sarebbe così estrema visto che la loro singolarita è molto lonata dall'orizzonte degli eventi quindi ammeno che non si arrivi molto "all'interno non si dovrebbero osservare forze di marea significative
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#4 |
Senior Member
Iscritto dal: May 2006
Città: Marikina City (Metro Manila, PHL) ↔ San Gimignano (Siena, ITA)
Messaggi: 428
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...quindi le galassie con al centro dei buchi neri supermassicci (e quasi tutte ce l'hanno) non sono altro che dei meri dischi di accrescimento?
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"If the radiance of a thousand suns were to burst at once into the sky that would be like the splendor of the Mighty One… I am become Death, the Shatterer of Worlds" - J. Robert Oppenheimer, quoting "The Bhagavad Gita", near Alamogordo, New Mexico, USA, on July 16, 1945 ■ Notebook: HP HDX16-1040el ■ Lyrical Equation ![]() ![]() ![]() |
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#5 | |
Senior Member
Iscritto dal: Jul 2001
Messaggi: 229
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Quote:
Se si pensa bene non è che al centro di ogni galassia ci sia un buco nero.... direi più che altro all'inverso il buco nero si trova in una posizione xy col tempo grazie alla forza di attrazione avvicina a se cio che gli sta intorno facendo si che un insieme di corpi celesti etri nel suo raggio di azione. Essendo la forza attrattiva in teoria esercitata in modo simile in tutte le dimensioni/direzioni viene per forza di cose a trovarsi al centro. Probabilmente il raggruppamento in galassie e determinato proprio dagli insiemi di corpi pertinenti ad ogni singolo buco
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