About blach holes
(http://orbiter-forum.com/showthread.php?t=1040)
(I haven't had the time to check precisely that translation but i think that, the one in the other...).
"If black holes supermassifs, located at the heart of the galaxies, and the small black holes, resulting from died from a massive star, are numerous in the Universe, the black holes of intermediate mass seem practically absent observations of the astronomers.
An article (to be) appeared in the edition of April 10 of Astrophysical Journal comes to reveal us the presence of an intermediate black hole to the centre even of our galaxy.
The principal authors of the article are Eva Noyola of the Max Planck Institute and the University from Texas in Austin, Karl Gebhardt, him also of the University of Texas and Marcel Bergman of Gemini Observatory.
They used the recordings carried out by the advanced camera of the space telescope Hubble and those of Gemini Observatory Southern in Chile by its spectrograph, to study a globular cluster located at 17 000 years light of us in the constellation of the Centaur.
Omega of the Centaur or NGC 5139 is a large globular cluster including/understanding more than one million stars, visible with the naked eye since the southern hemisphere. The astronomers particularly studied radial speeds of stars located close to its center. They are abnormally high compared to the theoretical calculations deduced from the mass of stars observed. The only possible explanation of the behavior of the heart of the cluster is the presence, in its centre, of a black hole of intermediate mass, estimated at 40 000 solar masses.
Omega of the Centaur was already noticed previously by its atypical anomalies of the other globular clusters. It is more flattened, turns more quickly, and has stars having different ages.
In a traditional globular cluster, the stars all are practically born at the same time. Omega of the Centaur has, him, three generations of different stars and its total age is estimated at 12 billion years against 13 for our Milky Way. .
The discovery of an intermediate black hole in its center comes to start again the idea that Oméga of the Centaur does not result from the collapse of a large paramount gas cloud of our Galaxy. It would be the core of a dwarf galaxy captured which saw, at the time of its meeting with our Milky Way, its stars to be made absorb in the galactic mass.
The researchers propose starting from their discovery a tempting assumption: the intermediate black holes are perhaps not as rare as one did not estimate it until now. They are in the heart of some of the globular clusters (for the moment 150 globular clusters were counted in our Milky Way) and are the seeds which constitute the black holes supermassifs giant galaxies.
The intermediate black hole of Omega of the Centaur is "one of the black holes quietest to date discovered", comments on Noyola. There no activity related to the presence of a matter accretion disc around him could be detected."
http://legnome.net/2008/04/02/le-coeur-noir-domega-du-centaure/..
(http://orbiter-forum.com/showthread.php?t=1040)
(I haven't had the time to check precisely that translation but i think that, the one in the other...).
"If black holes supermassifs, located at the heart of the galaxies, and the small black holes, resulting from died from a massive star, are numerous in the Universe, the black holes of intermediate mass seem practically absent observations of the astronomers.
An article (to be) appeared in the edition of April 10 of Astrophysical Journal comes to reveal us the presence of an intermediate black hole to the centre even of our galaxy.
The principal authors of the article are Eva Noyola of the Max Planck Institute and the University from Texas in Austin, Karl Gebhardt, him also of the University of Texas and Marcel Bergman of Gemini Observatory.
They used the recordings carried out by the advanced camera of the space telescope Hubble and those of Gemini Observatory Southern in Chile by its spectrograph, to study a globular cluster located at 17 000 years light of us in the constellation of the Centaur.
Omega of the Centaur or NGC 5139 is a large globular cluster including/understanding more than one million stars, visible with the naked eye since the southern hemisphere. The astronomers particularly studied radial speeds of stars located close to its center. They are abnormally high compared to the theoretical calculations deduced from the mass of stars observed. The only possible explanation of the behavior of the heart of the cluster is the presence, in its centre, of a black hole of intermediate mass, estimated at 40 000 solar masses.
Omega of the Centaur was already noticed previously by its atypical anomalies of the other globular clusters. It is more flattened, turns more quickly, and has stars having different ages.
In a traditional globular cluster, the stars all are practically born at the same time. Omega of the Centaur has, him, three generations of different stars and its total age is estimated at 12 billion years against 13 for our Milky Way. .
The discovery of an intermediate black hole in its center comes to start again the idea that Oméga of the Centaur does not result from the collapse of a large paramount gas cloud of our Galaxy. It would be the core of a dwarf galaxy captured which saw, at the time of its meeting with our Milky Way, its stars to be made absorb in the galactic mass.
The researchers propose starting from their discovery a tempting assumption: the intermediate black holes are perhaps not as rare as one did not estimate it until now. They are in the heart of some of the globular clusters (for the moment 150 globular clusters were counted in our Milky Way) and are the seeds which constitute the black holes supermassifs giant galaxies.
The intermediate black hole of Omega of the Centaur is "one of the black holes quietest to date discovered", comments on Noyola. There no activity related to the presence of a matter accretion disc around him could be detected."
http://legnome.net/2008/04/02/le-coeur-noir-domega-du-centaure/..
