10 - Black Holes and Gamma Ray Bursts

10 - Black Holes and Gamma Ray Bursts - Supermassive black...

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Supermassive black holes SgrA * the black hole at the center of our Galaxy Visible wavelength image toward center of Milky Way Infrared image of galactic center
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The BH at the Galactic Center -- originally detected as a bright cm-wave radio source -- Sgr A * host of phenomena in galactic center dense central cluster of stars stellar orbits ==> M BH ~ 4x10 6 M sun required : infrared cameras adaptive optics techniques IR – less absorbed by interstellar dust (vital for Gal. Cntr.) cooler objects (star forming regions)
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but galactic center (in Sagittarius) very extincted by dust clouds therefore must observe longer wavelengths to see it. Visible light Near infrared - 2 μ m stars cm-wave radio plasma arcs & Sgr A * Near infrared ionized H gas near infrared
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Very Large Array (New Mexico) 27 Tel., each w/ D=25m maximum baseline: 36 km cm wavelengths
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Radio image of central ~ 2 deg radio emission from relativistic elections streaming along magnetic field lines galactic plane
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central area of radio image in spiral radio is from e - scattering off of p + (called Bremsstrahlung emission)
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xray from million degree gas (shock heated) xray & infrared (stars)
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To measure the stellar orbits near Sgr A* need high resolution to separate stars and see motions Near infrared - 2 μ m stars Adaptive optics ==> correct for atmospheric blurring (‘seeing’)
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