Fig. 2.
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Diffuse emission spectrum of the central part of M 82, obtained from the Chandra ACIS-S. The flux density is in units of 10−14 erg s−1 cm−2 keV−1. Upper panel: The 0.7−8 keV spectrum. Lower panel: The Fe K band spectrum of the same data. The three vertical dotted-lines indicates the expected centroid energies of 6.4 keV, 6.7 keV and 6.96 keV for cold Fe K, Fe XXV and Fe XXVI, respectively. The grey line indicates the fitted model of a power-law and three Gaussian lines.
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