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Kenji Hamaguchi, Robert Petre, Hironori Matsumoto, Masahiro Tsujimoto, Stephen S. Holt, Yuichiro Ezoe, Hideki Ozawa, Yohko Tsuboi, Yang Soong, Shunji Kitamoto, Akiko Sekiguchi, Motohide Kokubun, Suzaku Observation of Diffuse X-Ray Emission from the Carina Nebula, Publications of the Astronomical Society of Japan, Volume 59, Issue sp1, 30 January 2007, Pages S151–S161, https://doi.org/10.1093/pasj/59.sp1.S151
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Abstract
We studied extended X-ray emission from the Carina Nebula taken with the Suzaku CCD camera XIS on 2005 August 29. The X-ray morphology, plasma temperature, and absorption to the plasma are consistent with the earlier Einstein results. The Suzaku spectra newly revealed emission lines from various species, including oxygen, but not from nitrogen. This result restricts the |$\mathrm{N/O}$| ratio to be significantly low, compared with evolved massive stellar winds, suggesting that the diffuse emission originated in an old supernova remnant or a super shell produced by multiple supernova remnants. The X-ray spectra from the north and south of |$\eta$| Car showed distinct differences between 0.3–2 keV. The south spectrum shows strong L-shell lines of iron ions and K-shell lines of silicon ions, while the north spectrum shows them weak in intensity. This means that the silicon and iron abundances are a factor of 2–4 higher in the south region than in the north region. The abundance variation may be produced by an SNR ejecta, or related to dust formation around the star-forming core.
