2008/09/20 by Yuichiro Ezoe, Kenji Hamaguchi, Ezoe, Yuichiro +12
Biochemistry, Genetics and Molecular Biology · Engineering · Physics and Astronomy · #Astro and Planetary Science #Astronomical Observations and Instrumentation #Astrophysics (astro-ph) #FOS: Physical sciences #Geomagnetism and Paleomagnetism Studies #astro-ph
paper · pdf · doi:10.48550/arxiv.0809.3495
29 pages, 8 figures, accepted for publication in PASJ
arxiv created 2008/09/20 · openalex publication_date 2008/09/20 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
The eastern tip region of the Carina Nebula was observed with the Suzaku XIS for 77 ks to conduct a high-precision spectral study of extended X-ray emission. XMM-Newton EPIC data of this region were also utilized to detect point sources. The XIS detected strong extended X-ray emission from the entire field-of-view with a 0.2--5 keV flux of 0.7∼4×10-14 erg s-1 arcmin-2. The emission has a blob-like structure that coincides with an ionized gas filament observed in mid-infrared images. Contributions of astrophysical backgrounds and the detected point sources were insignificant. Thus the emission is diffuse in nature. The X-ray spectrum of the diffuse emission was represented by a two-temperature plasma model with temperatures of 0.3 and 0.6 keV and an absorption column density of 2×1021 cm-1. The X-ray emission showed normal nitrogen-to-oxygen abundance ratios and a high iron-to-oxygen abundance ratio. The spectrally deduced parameters, such as temperatures and column densities, are common to the diffuse X-ray emission near η Car. Thus, the diffuse X-ray emission in these two fields may have the same origin. The spectral fitting results are discussed to constrain the origin in the context of stellar winds and supernovae.