International Journal of Astronomy
p-ISSN: 2169-8848 e-ISSN: 2169-8856
2015; 4(1): 5-11
doi:10.5923/j.astronomy.20150401.02
E. M. Howard
Department of Physics and Astronomy, Macquarie University, Sydney, Australia
Correspondence to: E. M. Howard, Department of Physics and Astronomy, Macquarie University, Sydney, Australia.
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Copyright © 2015 Scientific & Academic Publishing. All Rights Reserved.
Multi-wavelength monitoring of Sgr A* flaring activity confirms the presence of embedded structures within the disk on size scales commensurate with the innermost accretion region, matching size scales that are derived from observed light curves within a broad range of wavelengths. We explore here a few of the observational signatures for an orbiting spot in non-keplerian motion near the event horizon of Sgr A* and model light curves from plunging emitting material near the marginally stable orbit of Sgr A*. All special and general relativistic effects (relativistic beaming, redshifts and blue-shifts, lensing effect, photon time delays) for unpolarized synchrotron emission near a Schwarzschild and Kerr black hole are all taken into consideration.
Keywords: Sgr A* light curve, Hot spot model, Black hole ray-tracing, Plunging orbit, Black hole orbital motion
Cite this paper: E. M. Howard, Plunging Plasma Blobs near the Marginally Stable Orbit of Sgr A*, International Journal of Astronomy, Vol. 4 No. 1, 2015, pp. 5-11. doi: 10.5923/j.astronomy.20150401.02.
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Figure 5. The angular velocity evolution during the plunge of the blob from ISCO towards the event horizon, for an extremely rotating black hole and for a Schwarzschild black hole |