A Diffuse X-Ray Source, AX J1843.80352: Association with the Radio Complex G28.6-0.1 and Identification of a New Supernova Remnant
A Diffuse X-Ray Source, AX J1843.80352: Association with the Radio Complex G28.6-0.1 and Identification of a New Supernova Remnant
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DOI：
10.1093/pasj/53.4.l21
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发表时间：
2001-07
影响因子：
2.3
通讯作者：
A. Bamba;M. Ueno;K. Koyama;S. Yamauchi
中科院分区：
文献类型：
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作者：
A. Bamba;M. Ueno;K. Koyama;S. Yamauchi
ASCA在盾牌座中发现了一个扩展源。X射线形态为南北长的椭圆形，平均直径约10 '。图像中心位于RA = 18 h43 m53 s，DEC = 03 D52 '55“”（以下简称AX J1843.8-0352）。AX J1843.8-0352的南北边缘与G28.6-0.1复合体的非热射电源C和F有关（Helfand et al. 1989）。的X-射线光谱拟合与一个模型的薄的热等离子体在非平衡电离的温度为5.4千电子伏或幂律的光子指数为2.1。吸收柱为（2.4-4.0）E ~（22）/cm ~ 2，可能位于盾臂，在距离约为7 kpc的合理假设下，我们估计其平均直径约为20 pc，平均X射线光度约为3E ~（34）erg/s。虽然一个薄的热等离子体模型的Sedov解决方案给出了一个年轻的壳状SNR的参数，没有强的发射线被发现与金属丰度太阳。因此，对于射电和X射线光谱以及形态而言，更可能的情况是AX J1843.8-0352是一个主要发射同步加速器X射线的壳状SNR。
ASCA discovered an extended source in the Scutum constellation. The X-ray morphology is an elliptical shape elongated from north to south with a mean diameter of about 10'. The image center is located at RA = 18h43m53s, DEC = 03D52'55'' (hereafter, AX J1843.8-0352). The north and south rims of AX J1843.8-0352 are associated with non-thermal radio sources C and F of the G28.6-0.1 complex (Helfand et al. 1989). The X-ray spectrum was fitted with a model of either a thin thermal plasma in non-equilibrium ionization of a temperature 5.4 keV or a power-law of photon index 2.1. The absorption column is (2.4-4.0)E22 /cm2, which probably places this source in the Scutum arm. With a reasonable distance assumption of about 7 kpc, we estimate the mean diameter and X-ray luminosity to be ~20 pc and ~3E34 erg/s, respectively. Although a Sedov solution for a thin thermal plasma model gives parameters of a young shell-like SNR, no strong emission lines are found with the metal abundances being ~solar. Thus, a more likely scenario for both the radio and X-ray spectra and the morphologies is that AX J1843.8-0352 is a shell-like SNR which predominantly emits synchrotron X-rays.