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Current high-energy emission around black holes : by Chang-Hwan Lee; Hŏn-yŏng Chang; Kodŭng Kwahagwŏn (Korea)

By Chang-Hwan Lee; Hŏn-yŏng Chang; Kodŭng Kwahagwŏn (Korea)

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We found that the frequency-resolved energy spectra had a break around 7 keV, and were well approximated by a broken power law, when the frequency range was higher than a few Hz. 0 below ~ 7 keV and was 2-3 above ~ 7 keV. Thus we used a model consisting of a multi-color disk model and a broken power law to fit the energy spectra of each data set.

These are known as the MIT-Greenbank (MG) 1 6 , and the Parkes-MIT-NRAO (PMN) 5 1 5 2 surveys, which resulted in 8 published catalogs. 85 GHz plot of ~33,500 radio sources, drawn from the northern NRAO 1987 Greenbank (87GB) survey, and from the southern PMN 31 surveys, is shown in Figure 3. It is clear that the vast majority of radio sources are isotropically distributed in the sky, and hence probably at cosmological distances. 85 GHz sky map are RLAGN. Such surveys are then very efficient in finding the 'galactic homes' of a vast population of distant MBHs in our universe.

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