![]() ![]() An examination of the unbinned, stacked HEG ± 1 spectrum reveals fine structure in the iron line complex. In all cases, the line centroids and equivalent widths are consistent with those measured from low-resolution CCD spectra. We detect a strong 6.7 keV iron emission line in the HEG spectra and a 3.1 keV emission line in the MEG spectra. We model the background data sets with a cubic spline and fit the unbinned Sgr A* spectra with a simple parametric model of a power law plus Gaussian lines under the effects of interstellar extinction. Utilizing custom background regions and filters for removing overlapping point sources, this work provides the first-ever look at stacked HETG spectra of Sgr A*. ![]() The Chandra Galactic Center X-ray Visionary Program obtained approximately 3 Ms (1 month) of Chandra high-energy transmission grating (HETG) data, offering the only opportunity to examine the quiescent X-ray emission of Sgr A* with high-resolution spectroscopy. This problem has motivated a host of theoretical models to explain radiatively inefficient accretion flows. In quiescence, Sgr A* is surprisingly dim, shining 100,000 times less than expected for its environment.
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