论文标题
发现新的超新星残留G21.8-3.0
Discovery of a new supernova remnant G21.8-3.0
论文作者
论文摘要
银河平面的敏感无线电连续调查是发现新的超新星残留物（SNR）的理想选择。从银河平面的中间λ6cm极化调查中，在L = 21.8度，b = -3.0度下发现了延长的壳状结构，其大小约为1度。用Effelsberg 100 m射电望远镜在λ11cm处进行了新的观察结果，以估计源光谱与Urumqiλ6cm和Effelsbergλ21cm数据。发现G21.8-3.0的光谱指数为α= -0.72 {\ pm} 0.16。在λ6cm和λ11cm处的G21.8-3.0的东半部中，大多数都检测到极化发射。这些特性，以及沿北部外围的Hα细丝以及缺乏红外发射，表明在壳型SNR中，发射是非热的。
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.
