Relativistic Spectra of Hot Black-Hole Winds

We examine hybrid thermal-nonthermal synchrotron spectra from a spherically symmetric, optically-thin wind, taking into account the relativistic effect. In the relativistic flow from the central object, due to the relativistic beaming effect, the observed spectra often shift towards high frequency and high intensity directions. In the optically thin outflows, however, we find that the intensity of the observed spectra decreases compared with that of the emitted ones, although the peak frequency shifts towards the high frequency direction. This is because in the optically thin outflows we can see the far side flows that go away from the observer. We thus carefully consider optically thin relativistic flows around a black hole such as Sgr A$^*$.Comment: 7pages, 6 figures, Accepted for publication in PAS

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京都大学0048新制・課程博士博士(理学)甲第9945号理博第2606号新制||理||1329(附属図書館)UT51-2003-H366京都大学大学院理学研究科物理学・宇宙物理学専攻(主査)教授 嶺重 慎, 教授 柴田 一成, 教授 大谷 浩学位規則第4条第1項該当Doctor of ScienceKyoto UniversityDA