Physics – Optics
Scientific paper
Dec 2004
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004aas...205.2404h&link_type=abstract
American Astronomical Society Meeting 205, #24.04; Bulletin of the American Astronomical Society, Vol. 36, p.1383
Physics
Optics
Scientific paper
We present the results of a dedicated monitoring program aimed at studying the intensity variations of the near-infrared emission associated with the supermassive black hole at the Galactic center (Sgr A*-IR.) This effort was carried out during the summer of 2004 with the W. M. Keck 10-meter telescope's adaptive optics system and covered seven nights, two of which were coordinated with several observatories, including the Chandra X-ray Telescope. Variability on a range of time scales, from minutes to months, was seen. These variations, which typically had an amplitude of a factor of no more than two, extended through observations made in concert with Chandra, which showed no X-ray variations, although the timescales for variations were similar. Comparisons of near-simultaneous data obtained in the K' (2.1 μ m)- and L' (3.8 μ m)- bandpasses suggest that Sgr A*-IR has an observed K'-L' of 2.6 mag, which is more than a magnitude redder than the surrounding stellar sources and consistent with synchrotron models for the emission.
Baganoff Frederick Keith
Becklin Eric E.
Ghez Andrea M.
Hornstein Seth D.
Lu Jianhua
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