arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2002.06537astro-ph.GAhep-ph
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发现一个新的超新星遗迹G21 .8-3.0

Discovery of a new supernova remnant G21.8-3.0

X. Y. Gao, P. Reich, W. Reich, L. G. Hou, J. L. Han

摘要:

对银河系平面进行高灵敏度的射电连续巡天是发现新的超新星遗迹(SNRs)的理想方法。在中德λ6厘米银道面偏振巡天中,在l = 21.8度,b = -3.0度处发现了一个扩展的壳状结构,其大小约为1度。利用Effelsberg 100-m射电望远镜在λ11 cm处进行了新的观测,以结合乌鲁木齐λ6 cm和Effelsberg λ21 cm数据来估计源谱。发现G21.8-3.0的光谱指数为α = -0.72 { \pm } 0.16。偏振发射主要在G21.8-3.0的东半部在λ6 cm和λ11 cm处被检测到。这些性质,连同沿着其北部外围的Hα灯丝和红外发射的缺乏,表明发射是非热的,这在壳型SNR中是常见的。

英文摘要:

Sensitive radio continuum surveys of the Galactic plane are ideal for discovering new supernova remnants (SNRs). From the Sino-German λ6 cm polarisation survey of the Galactic plane, an extended shell-like structure has been found at l = 21.8 degree, b = -3.0 degree, which has a size of about 1 degree. New observations were made with the Effelsberg 100-m radio telescope at λ11 cm to estimate the source spectrum together with the Urumqi λ6 cm and the Effelsberg λ21 cm data. The spectral index of G21.8-3.0 was found to be α = -0.72 {\pm} 0.16. Polarised emission was mostly detected in the eastern half of G21.8-3.0 at both λ6 cm and λ11 cm. These properties, together with the Hα filament along its northern periphery and the lack of infrared emission, indicate that the emission is non-thermal as is usual in shell-type SNRs.

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