Obtaining An Unbiased Measurement of the Position Of SgrA*-IR

Details Obtaining An Unbiased Measurement of the Position Of SgrA*-IR Obtaining An Unbiased Measurement of the Position Of SgrA*-IR

Jan 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010aas...21541306p&link_type=abstract

American Astronomical Society, AAS Meeting #215, #413.06; Bulletin of the American Astronomical Society, Vol. 42, p.251

Astronomy and Astrophysics

Astronomy

Scientific paper

We present an analysis of short, infrared, exposures of a field containing, SgrA*-IR, the emissive source associated with the Milky Way's central supermassive black hole, aimed at obtaining an unbiased measurement of its location. Such a measurement would nail down one of the key parameters in modeling our Galaxy's central potential. It is well known that the observed position of this emission in deep images is significantly biased due to underlying stars. We have examined the positional bias of SgrA*-IR and attempted to find an accurate IR position by taking advantage of its photometric variability. We find that the position is less biased when Sgr A*-IR is in the bright state. With this new technique, the position of Sgr A*-IR is now much more consistent with the position of Sgr A*-Radio and the position obtained in unconstrained models of the orbital motion of the short period star S0-2.

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