New Orbital Analysis of Stars at the Galactic Center Using Speckle Holography

Details New Orbital Analysis of Stars at the Galactic Center Using Speckle Holography New Orbital Analysis of Stars at the Galactic Center Using Speckle Holography

Jan 2012

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2012aas...21925201b&link_type=abstract

American Astronomical Society, AAS Meeting #219, #252.01

Physics

Optics

Scientific paper

Since 1995 our group has monitored the stars orbiting the supermassive black hole, Sgr A*, at the Galactic Center. In that time, we have taken both speckle (1995-2005) and Adaptive Optics data (2005-present) and use the combined data sets to analyze the motions of stars orbiting Sgr A* and constrain its mass and the distance to the Galactic Center. The speckle data taken from 1995-2005 are very important in this orbital analysis due to their 10-year baseline. Originally, this data was analyzed using the speckle shift-and-add method. Here we present the results of an improved analysis of this data using a technique called speckle holography. With this new analysis, we have increased the depth of our 1995-2005 maps by 2 magnitudes when compared to the shift-and-add maps. We thus add a 10-year baseline for stars that were previously only seen in the AO epochs and are able to better constrain their orbital parameters.

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