期刊
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
卷 493, 期 2, 页码 2188-2194出版社
OXFORD UNIV PRESS
DOI: 10.1093/mnras/staa419
关键词
methods: observational; ISM: supernova remnants; radio continuum: general
资金
- National Natural Science Foundation of China [11988101, U1831103, 11933011, 11833009]
- National Key R&D Program of China [2017YFA0402701]
- CAS-NWO cooperation programme
- Youth Innovation Promotion Association CAS
Sensitive radio continuum surveys of the Galactic plane are ideal for discovering new supernova remnants (SNRs). From the Sino-German lambda 6-cm polarization survey of the Galactic plane, an extended shell-like structure has been found at l = 21 degrees.8, b = -3 degrees.0, which has a size of about 1 degrees. New observations were made with the Effelsberg 100-m radio telescope at lambda 11 cm to estimate the source spectrum, together with Urumqi lambda 6-cm and Effelsberg lambda 21-cm data. The spectral index of G21.8-3.0 was found to be alpha = -0.72 +/- 0.16. Polarized emission was mostly detected in the eastern half of G21.8-3.0 at both lambda 6 and lambda 11 cm. These properties, together with the Ha 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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