Abstract
An analysis of a 29 ks Chandra ACIS-S observation of the young, Cassiopeia A-like supernova remnant in the irregular galaxy NGC 4449 is presented. The observed 0.5-2.1 keV spectrum reveals the likely presence of several emission lines, including O VIII at 0.65 and 0.77 keV, Ne X at 1.05 keV, Mg XI at 1.5 keV, and Si XIII at 1.85 keV. From the observed spectrum, we derive a NH = 1 × 1021 cm-2 and an X-ray temperature of T ≈ 9 × 106 K. A nonequilibrium ionization fit to the spectrum suggests an overabundance of oxygen around 20 times solar, consistent with the remnant's UV and optical emission-line properties. We discuss the remnant's approximate X-ray-derived elemental abundances and compare its X-ray spectrum and luminosity with other oxygen-rich remnants.
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