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The Chandra Carina Complex Project: Deciphering the Enigma of Carina's Diffuse X-ray Emission

Abstract : We present a 1.42 deg2 mosaic of diffuse X-ray emission in the Great Nebula in Carina from the Chandra X-ray Observatory Advanced CCD Imaging Spectrometer camera. After removing >14,000 X-ray point sources from the field, we smooth the remaining unresolved emission, tessellate it into segments of similar apparent surface brightness, and perform X-ray spectral fitting on those tessellates to infer the intrinsic properties of the X-ray-emitting plasma. By modeling faint resolved point sources, we estimate the contribution to the extended X-ray emission from unresolved point sources and show that the vast majority of Carina's unresolved X-ray emission is truly diffuse. Line-like correlated residuals in the X-ray spectral fits suggest that substantial X-ray emission is generated by charge exchange at the interfaces between Carina's hot, rarefied plasma and its many cold neutral pillars, ridges, and clumps.
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Submitted on : Tuesday, April 19, 2022 - 4:25:51 PM
Last modification on : Wednesday, April 20, 2022 - 3:40:06 AM

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Leisa K. Townsley, Patrick S. Broos, You-Hua Chu, Marc Gagné, Gordon P. Garmire, et al.. The Chandra Carina Complex Project: Deciphering the Enigma of Carina's Diffuse X-ray Emission. The Astrophysical Journal Supplement, 2011, 194, ⟨10.1088/0067-0049/194/1/15⟩. ⟨insu-03645989⟩

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