论文标题
可能发现Calvera的超新星残留物
Possible discovery of Calvera's supernova remnant
论文作者
论文摘要
我们报告了在Lofar两米高的Sky Survey（Lots）中发现Calvera Pulsar周围的低表面亮度无线电发射的环。它的中心为$α= 14 \ mathrm {h} 11 \ mathrm {m} 12.6 \ mathrm {s} $，$δ=+79^\ Mathrm {o} 23'15“ $，内部和外部半径为$ 14.2' $ 14.2' $，$ 28.4'$，和一个集成的弗莱兹，均为144 ats at 1444444444。 $ 1.08 \ PM0.15 $ JY。我们考虑了对环的三种可能的解释：它是H〜II区域，超新星残留（SNR）或一个奇数无线电圆（ORC）。环，脉冲星和X射线发射非平衡离子化等离子体的位置巧合，这使我们更喜欢SNR解释。如果源确实是SNR，并且证实了其与Calvera Pulsar的关联，则Calvera的SNR或G118.4+37.0将是银河系中的少数SNR之一。
We report the discovery of a ring of low surface brightness radio emission around the Calvera pulsar, a high Galactic latitude, isolated neutron star, in the LOFAR Two-metre Sky Survey (LoTSS). It is centered at $α=14\mathrm{h}11\mathrm{m}12.6\mathrm{s}$, $δ=+79^\mathrm{o}23'15"$, has inner and outer radii of $14.2'$ and $28.4'$, and an integrated flux density at 144 MHz of $1.08\pm0.15$ Jy. The ring center is offset by $4.9'$ from the location of the Calvera pulsar. H$α$ observations with the Isaac Newton Telescope show no coincident optical emission, but do show a small ($\sim20"$) optical structure internal to the ring. We consider three possible interpretations for the ring: that it is an H~II region, a supernova remnant (SNR), or an Odd Radio Circle (ORC). The positional coincidence of the ring, the pulsar, and an X-ray-emitting non-equilibrium ionisation plasma previously detected, lead us to prefer the SNR interpretation. If the source is indeed a SNR and its association with the Calvera pulsar is confirmed, then Calvera's SNR, or G118.4+37.0, will be one of few SNRs in the Galactic halo.
