Oscillation Phenomena in the disk around the massive black hole Sagittarius A* - Astrophysics > High Energy Astrophysical PhenomenaReportar como inadecuado




Oscillation Phenomena in the disk around the massive black hole Sagittarius A* - Astrophysics > High Energy Astrophysical Phenomena - Descarga este documento en PDF. Documentación en PDF para descargar gratis. Disponible también para leer online.

Abstract: We report the detection of radio QPOs with structure changes using the VeryLong Baseline Array VLBA at 43 GHz. We found conspicuous patterned changes ofthe structure with P = 16.8 +- 1.4, 22.2 +- 1.4, 31.2 +- 1.5, 56.4 +- 6 min,very roughly in a 3:4:6:10 ratio. The first two periods show a rotating one-armstructure, while the P = 31.4 min shows a rotating 3-arm structure, as ifviewed edge-on. At the central 50 microasec the P = 56.4 min period shows adouble amplitude variation of those in its surroundings. Spatial distributionsof the oscillation periods suggest that the disk of SgrA* is roughly edge-on,rotating around an axis with PA = -10 degree. Presumably, the observed VLBIimages of SgrA* at 43 GHz retain several features of the black hole accretiondisk of SgrA* in spite of being obscured and broadened by scattering ofsurrounding plasma.



Autor: M. Miyoshi, Zhi-Qiang Shen, T. Oyama, R.Takahashi, Y.Kato

Fuente: https://arxiv.org/







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