Recombining Plasma and Gamma-Ray Emission in the Mixed-morphology Supernova Remnant 3C 400.2
Recombining Plasma and Gamma-Ray Emission in the Mixed-morphology Supernova Remnant 3C 400.2
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DOI：
10.3847/1538-4357/aa72ee
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发表时间：
2017-05
期刊：
影响因子：
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通讯作者：
T. Ergin;A. Sezer;H. Sano;R. Yamazaki;Y. Fukui
中科院分区：
文献类型：
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作者：
T. Ergin;A. Sezer;H. Sano;R. Yamazaki;Y. Fukui
3C 4002属于混合形态的超新星遗迹类，显示出中心填充的x射线和贝壳状的射电形态。我们提出了一项研究3C 4002与档案Suzaku和费米- lat观测。我们在东北和东南地区的Suzaku光谱中发现了重组等离子体（RP）。两组分热等离子体模型很好地描述了这些区域的光谱：硬组分处于RP状态，而软组分处于碰撞电离平衡（CIE）状态。RP具有增强的丰度，表明x射线发射具有抛射起源，而CIE具有与星际物质相关的太阳丰度。西北和西南地区的x射线光谱最适合于双组分热等离子体模型：电离等离子体和CIE等离子体。我们已经检测到来自3C 4002的GeV伽玛射线发射在~ 5σ水平，假设具有幂律（PL）型光谱的点状源模型。我们还发现了一个新的GeV源，在~ 13σ水平，假设高斯扩展模型，在超新星遗迹附近具有pl型光谱。我们报告了3C 4002和新的扩展伽玛射线源的分析结果，并在现有NANTEN CO数据、Dominion射电天体物理天文台H i数据和Suzaku x射线分析结果的背景下讨论了3C 4002的伽玛射线发射性质。
3C 400.2 belongs to the mixed-morphology supernova remnant class, showing center-filled X-ray and shell-like radio morphology. We present a study of 3C 400.2 with archival Suzaku and Fermi-LAT observations. We find recombining plasma (RP) in the Suzaku spectra of north–east and south–east regions. The spectra of these regions are well described by two-component thermal plasma models: the hard component is in RP, while the soft component is in collisional ionization equilibrium (CIE) conditions. The RP has enhanced abundances, indicating that the X-ray emission has an ejecta origin, while the CIE has solar abundances associated with the interstellar material. The X-ray spectra of north–west and south–west regions are best fitted by a two-component thermal plasma model: an ionizing and a CIE plasma. We have detected GeV gamma-ray emission from 3C 400.2 at the level of ∼5σ, assuming a point-like source model with a power-law (PL) type spectrum. We have also detected a new GeV source at the level of ∼13σ, assuming a Gaussian extension model with a PL-type spectrum in the neighborhood of the supernova remnant. We report the analysis results of 3C 400.2 and the new extended gamma-ray source, and discuss the nature of gamma-ray emission of 3C 400.2 in the context of existing NANTEN CO data, Dominion Radio Astrophysical Observatory H i data, and the Suzaku X-ray analysis results.