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Paper: Consistency of the Infrared Variability of SGR A* over 22yr
Volume: 528, New Horizons in Galactic Center Astronomy and Beyond
Page: 233
Authors: Chen, Z.; Gallego-Cano, E.; Do, T.; Witzel, G.; Ghez, A. M.; Schödel, R.; Sitarski, B. N.; Becklin, E. E.; Lu, J.; Morris, M. R.; Dehghanfar, A.; Gautam, A. K.; Hees, A.; Hosek Jr., M. W.; Jia, S.; Mangian, A. C.; Matthews, K.
Abstract: We report new near-infrared (NIR) measurements of the supermassive black hole at the Galactic Center, Sgr A*, using early speckle data at the Keck Observatory taken prior to 2002. The improved speckle holography technique has enabled the detection of Sgr A* in the majority of speckle epochs covering 7 years. The average observed K magnitude of Sgr A* (1995 - 2005) is 16.0, which corresponds to a dereddened flux density of 3.4 mJy. The brightness and its variability is consistent over 22 years based on extrapolation modeled from AO-based short-term variability studies (2006 - 2016). We also present that the 2001 periapse of the extended, dusty object G1 had no apparent effect on the NIR emission from accretion flow onto Sgr A*.
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