arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1909.00501astro-ph.HE
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朱雀号对船底座星云西南区弥散X射线发射的观测

Suzaku Observation of Diffuse X-Ray Emission from a Southwest Region of the Carina Nebula

Yuichiro Ezoe, Kenji Hamaguchi, Aoto Fukushima, Tomohiro Ogawa, Takaya Ohashi

摘要:

2010年12月,朱雀天文台观测了船底座星云的西南区域,观测时间为47公里。在钱德拉战役观测中,这一区域显示出明显的软X射线发射。朱雀号在3.3x10^-14 erg s^{-1} arcmin^{-2}的表面亮度下,清晰地探测到了高于已知前景和背景成分的0.4-5 keV的漫发射。该光谱需要两个等离子体发射分量,kT约为0.2和0.5 keV,它们遭受N_H~ 1.9 × 10 ^{21} cm^{-2}的星际吸收。对假设两种温度等离子体处于电离平衡或非平衡状态的多种吸收模型进行了测试,但在chi ^2/d.o.f.方面没有显著差异。这些等离子体温度与早期朱雀观测中测量的船底座星云中部和东部的温度相似,但热成分的表面亮度明显低于其他区域。这意味着这两种血浆成分是物理分离的,并且具有不同的来源。相对于Fe的O,Ne和Mg的元素丰度有利于扩散等离子体起源于核心坍塌的超新星或大规模的恒星风。

英文摘要:

A southwest region of the Carina nebula was observed with the Suzaku observatory for 47 ks in 2010 December. This region shows distinctively soft X-ray emission in the Chandra campaign observations. Suzaku clearly detects the diffuse emission above known foreground and background components between 0.4-5 keV at the surface brightness of 3.3x10^-14 erg s^{-1} arcmin^{-2}. The spectrum requires two plasma emission components with kT~0.2 and 0.5 keV, which suffer interstellar absorption of N_H~1.9x10^{21} cm^{-2}. Multiple absorption models assuming two temperature plasmas at ionization equilibrium or non-equilibrium are tested but there is no significant difference in terms of chi^2/d.o.f.. These plasma temperatures are similar to those of the central and eastern parts of the Carina nebula measured in earlier Suzaku observations, but the surface brightness of the hot component is significantly lower than those of the other regions. This means that these two plasma components are physically separated and have different origins. The elemental abundances of O, Ne and Mg with respect to Fe favor that the diffuse plasma originates from core-collapsed supernovae or massive stellar winds.

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