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- W2053892752 abstract "We investigate the gamma-ray spectrum emitted from an ADAF and its dependence on the spin parameter of a central Kerr black hole, in order to examine whether the spectrum can be used to probe the spin parameter of black holes. We consider that the gamma-rays are produced through the decay of neutral pions created by proton-proton collisions in the vicinity of the central black hole. Since the energy distribution of the ion particles in an ADAF is not known, we consider two types of proton energy distributions: a thermal distribution and a power-law distribution. In the thermal model, we find that changes in the spin parameter from –0.95 to 0.95 can enhance the gamma-ray intensity by orders of magnitude. Thus, if the proton gas in an ADAF has a thermal distribution, the gamma-ray spectrum can be used as a probe to investigate the spin parameter of the central black hole. In the nonthermal model, on the other hand, the gamma-ray intensity is much less sensitive to the changes in the spin parameter than in the thermal model, and it would be difficult to estimate the spin parameter from the gamma-ray spectrum. We apply our model to the Galactic Center, Sgr A*. The unidentified gamma-ray source 3EG J1746–2851 is observed towards Sgr A* by EGRET. Our results show that the gamma-ray intensities predicted from our models are much lower than observations and we cannot find the spin parameter. We, however, consider that this is not a serious problem against our model since it is unclear whether the observed gammarays are from a point or a diffuse source at the Galactic Center. In order to investigate the spin parameter via the gamma-rays from the Galactic Center instruments with higher angular resolution is needed such as GLAST." @default.
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- W2053892752 date "2003-09-01" @default.
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- W2053892752 title "Gamma-ray emission from an ADAF around a Kerr black hole" @default.
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- W2053892752 doi "https://doi.org/10.1002/asna.200385046" @default.
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