Physics – Optics
Scientific paper
Apr 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008aps..apr.l8008w&link_type=abstract
American Physical Society, 2008 APS April Meeting and HEDP/HEDLA Meeting, April 11-15, 2008, abstract #L8.008
Physics
Optics
Scientific paper
If a class of stars orbits the central black hole in our galaxy in short period (˜0.1 year), high eccentricity (˜0.9) orbits, they will experience precessions of their orbital planes induced by both relativistic frame-dragging and the quadrupolar gravity of the hole, at levels that could be as large as 10 μarcseconds per year, if the black hole is rotating faster than 1/2 of its maximum rotation rate. Astrometric observations of the orbits of at least two such stars can in principle lead to a determination of the angular momentum vector J of the black hole and its quadrupole moment Q2. This could lead to a test of the general relativistic no-hair theorems, which demand that Q2= - J^2/M. Future high-precision adaptive infrared optics instruments may make such a fundamental test of the black-hole paradigm possible.
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