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Generalized equipartition method from an arbitrary viewing angle
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DOI：10.1093/mnras/stad1269.png)
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The equipartition analysis yields estimates of the radius and energy of synchrotron self-absorbed radio sources. Here we generalize this method to relativistic off-axis viewed emitters. We find that the Lorentz factor Gamma and the viewing angle theta cannot be determined independently but become degenerate along a trajectory of minimal energy solutions. The solutions are divided into on-axis and off-axis branches, with the former reproducing the classical analysis. A relativistic source viewed off-axis can be disguised as an apparent Newtonian one. Applying this method to radio observations of several tidal disruption events, we find that the radio flare of AT 2018hyz, which was observed a few years after the optical discovery, could have been produced by a relativistic off-axis jet with a kinetic energy of similar to 10(53) erg that was launched around the time of discovery.
Keyword:
transients: tidal disruption events
期刊
IF:
4.8
论文数:
7.1W
被引数:
25.0W
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引用论文
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The tidal disruption event AT2018hyz-I. Double-peaked emission lines and a flat Balmer decrement潮汐破坏事件AT2018hyz-I。双峰发射线和平坦的Balmer减量
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