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Discovery of a new supernova remnant G21.8−3.0 by Gao, X Y; Reich, P; Reich, W; Hou, L G; Han, J L is a Physics and Astronomy article available to read on EtoBox.

What is Discovery of a new supernova remnant G21.8−3.0 about?

## ABSTRACT Sensitive radio continuum surveys of the Galactic plane are ideal for discovering new supernova remnants (SNRs). From the Sino-German λ6-cm polarization survey of the Galactic plane, an extended shell-like structure has been found at l = 21${^{\circ}\_{.}}$8, b = −3${^{\circ}\_{.}}$0, which has a size of about 1°. New observations were made with the Effelsberg 100-m radio telescope at λ11 cm to estimate the source spectrum, together with Urumqi λ6-cm and Effelsberg λ21-cm data. The spectral index of G21.8−3.0 was found to be α = −0.72 ± 0.16. Polarized emission was mostly detected in the eastern half of G21.8−3.0 at both λ6 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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Author

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

Publisher

John Wiley and Sons; Oxford University Press; Oxford University Press (OUP) (ISSN 0035-8711)

Published

2020

Language

EN

Field

Physics and Astronomy (Physical Sciences)