Observing the Flares of Sgr a* with the Very Large Telescope Interferometer

Details Observing the Flares of Sgr a* with the Very Large Telescope Interferometer Observing the Flares of Sgr a* with the Very Large Telescope Interferometer

Sep 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008mgm..conf.1075p&link_type=abstract

"THE ELEVENTH MARCEL GROSSMANN MEETING On Recent Developments in Theoretical and Experimental General Relativity, Gravitation an

Physics

Optics

1

Galaxy: Nucleus, Gravitational Lensing, Techniques: Interferometric

Scientific paper

Sgr A*, the super-massive compact object at the centre of the Galaxy, is known to exhibit energetic events ("flares") in the near infrared and X-ray domains. These events are likely due to processes very close to the central object, on a scale of a few Schwarzschild radii (≃ 10 μas). The Very Large Telescope Interferometer (VLTI) is in principle able to deliver astrometry with this accuracy. We have used relativistic ray tracing to study the possible apparent path of the centroid of flares given reasonable assumptions, and shown that the VLTI will be able to resolve proper motion of flares. We also find that the lightcurves already observed with adaptive optics techniques are well explained by a hot spot being sheared on its orbit around the black hole.

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