通过 "铃作 "观测对超新星残余物 3C 400.2 进行等离子体诊断

IF 2.2 4区物理与天体物理 Q2 ASTRONOMY & ASTROPHYSICS

Publications of the Astronomical Society of Japan Pub Date : 2024-09-11 DOI:10.1093/pasj/psae081

Masataka Onuma, Kumiko K Nobukawa, Masayoshi Nobukawa, Shigeo Yamauchi, Hideki Uchiyama

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引用次数: 0

摘要

我们报告了对超新星残余物（SNR）3C 400.2 的等离子体诊断结果，之前的研究报告称该残余物具有重组等离子体。为了仔细估计背景，我们同时拟合了从SNR和背景区提取的光谱，并评估了污染背景区光谱的SNR发射以及源区光谱中的背景发射。与之前的研究不同，SNR 辐射是由源自星际介质的碰撞电离平衡等离子体和源自喷出物的电离等离子体所产生的。此外，我们还在SNR附近发现了一个不明X射线源，即Suzaku J1937.4$+$1718，它伴随着一条置信度为2.8\sigma$的$\sim$4.4 keV的发射线。由于在静止帧中没有明显的原子线，所以Suzaku J1937.4$$+$1718可能是一个银河系外的天体，它的铁线发生了红移。

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Plasma diagnostics of supernova remnant 3C 400.2 by Suzaku observations

We report on the results of plasma diagnostics of the supernova remnant (SNR) 3C 400.2, which has been reported to have a recombining plasma by previous studies. For careful background estimation, we simultaneously fitted spectra extracted from the SNR and background regions and evaluated the SNR emission contaminating the background-region spectrum as well as the background emission in the source-region spectrum. The SNR emission is explained by the collisional ionization equilibrium plasma originating from the interstellar medium and the ionizing plasma originating from the ejecta, in contrast to previous studies. In addition, we found an unidentified X-ray source near the SNR, Suzaku J1937.4$+$1718, which is accompanied by an emission line at $\sim$4.4 keV with a $2.8\sigma$ confidence level. Because there is no striking atomic line at the energy in the rest frame, Suzaku J1937.4$+$1718 could be an extragalactic object with a redshifted Fe line.

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来源期刊

Publications of the Astronomical Society of Japan 地学天文-天文与天体物理

CiteScore

4.10

自引率

13.00%

发文量

审稿时长

4-8 weeks

期刊介绍： Publications of the Astronomical Society of Japan (PASJ) publishes the results of original research in all aspects of astronomy, astrophysics, and fields closely related to them.