In the center of the Galaxy observed for decades.
Sagittarius a* (Sgr A*) is a supermassive black hole at the center of the milky Way, located to the us 100 times closer than any other of the nearby supermassive black holes. Given this fact, Sgr A* is a Prime candidate for the study of the luminescence of a substance as its accretion into a black hole.
Modeling of the mechanisms of variability of light is a serious challenge to our understanding of accretion in supermassive black holes, but it is believed that the ratio between the time of the flares at different wavelengths can reveal information about the spatial structure: for example, on whether the hotter material near a black hole. One of the main hindrances in promoting this issue – the paucity of simultaneous observations at different wavelengths.
Astronomers Giovanni Fazio, Joe Hora, Steve Wilner, Matt Ashby, mark Carved and Howard Smith of the Harvard-Smithsonian center for astrophysics and their colleagues conducted a series of multiwavelength observing campaigns involving the use of the IRAC camera on the telescope “Spitzer”, the x-ray Observatory “Chandra”, as well as ground Observatory Keck and complex Submillimeter Array (SMA). Their research described in the Astrophysical journal. “Spitzer” could continuously monitor fluctuations of the black hole during 23.4 hours during each session, which is not able to make any one ground Observatory.
Multiwavelength view of the region around the galactic center of the milky Way in x-ray (blue), infrared (red) and optical spectra. Astronomers have measured the events of the flares at different wavelengths emanating from a supermassive black hole at the center / © X-ray: NASA/CXC/UMass/D.
Computational modeling of radiation near a black hole is a complex work that requires, among other things, simulations of the accretion of the material, its heating and radiation, as well as the predictions of General relativity in terms of how this radiation will see the observer (since all this happens near a black hole is probably spinning). Theorists suspect that the emission at shorter wavelengths appears closer to the object and colder radiation is already far away from him. In other words, the first is radiation at short wavelengths followed by radiation for long.
Consequently, the time delay may reflect the distance between these zones. Indeed, in earlier observations, some of which held the same team, researchers found that hot flashes alloyprocess preceded submillimeter flares observed in SMA. In their paper, the researchers report on two outbreaks are likely violating these and other obvious models: the first event occurred simultaneously at all wavelengths, and the second x-ray, and submillimeter alloyprocess outbreaks have occurred within an hour, that is not quite the same but still very close to each other. New observations will be expanded in future concurrent campaigns.
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