Chandra Observations of the Luminous, Oxygen‐rich Supernova Remnants in the Irregular Galaxy NGC 4449
The Astrophysical Journal
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. 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
Patnaude, Daniel J. and Fesen, Robert A., "Chandra Observations of the Luminous, Oxygen‐rich Supernova Remnants in the Irregular Galaxy NGC 4449" (2003). Open Dartmouth: Faculty Open Access Articles. 2586.