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Suzaku Observation of Diffuse X-ray Emission from the Carina NebulaWe studied extended X-ray emission from the Carina Nebula taken with the Suzaku CCD camera XIS on 2005 Aug. 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 spices including oxygen, but not from nitrogen. This result restricts the N/O ratio significantly low, compared with evolved massive stellar winds, suggesting that the diffuse emission is 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 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 relate to the dust formation around the star forming core.
Document ID
20070016618
Acquisition Source
Goddard Space Flight Center
Document Type
Preprint (Draft being sent to journal)
Authors
Hamaguchi, Kenji (NASA Goddard Space Flight Center Greenbelt, MD, United States)
Petre, Robert (NASA Goddard Space Flight Center Greenbelt, MD, United States)
Matsumoti, Hironori (Kyoto Univ. Sakyo, Japan)
Tsujimoto, Masahiro (Rikkyo Univ. Tokyo, Japan)
Holt, Stephan S. (Franklin W. Olin Coll. of Engineering Needham, MA, United States)
Ezoe, Yuichiro (Institute of Space and Astronautical Science Sagamihara, Japan)
Ozawa, Hideki (Osaka Univ. Toyonaka, Japan)
Tsuboi, Yohko (Chuo Univ. Tokyo, Japan)
Soong, Yang (NASA Goddard Space Flight Center Greenbelt, MD, United States)
Kitamoto, Shunji (Rikkyo Univ. Tokyo, Japan)
Sekiguchi, Akiko (Rikkyo Univ. Tokyo, Japan)
Kokubun, Motohide (Tokyo Univ. Japan)
Date Acquired
August 23, 2013
Publication Date
January 1, 2007
Subject Category
Astrophysics
Distribution Limits
Public
Copyright
Public Use Permitted.

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