Multi-epoch radio imaging of γ-ray Nova V959 Mon
Multi-epoch radio imaging of γ-ray Nova V959 Mon
复制标题
γ 射线 Nova V959 Mon 的多历元射电成像
DOI：
10.1093/mnras/stx1087
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发表时间：
2017
影响因子：
4.8
通讯作者：
M. Argo
中科院分区：
文献类型：
--
作者：
F. Healy;T. O’brien;R. Beswick;A. Avison;M. Argo;M. Argo
V959 Mon (Nova Mon 2012) 于 2012 年 6 月首次被费米大面积望远镜探测到，作为瞬态伽马射线源。随后的光学观测表明，这种伽马射线发射是由于经典的新星爆炸造成的。 2012 年 6 月至 9 月期间，用甚大阵列 (VLA) 对 V959 Mon 进行的多频观测显示出显着的增亮，并且光谱随着频率的增加而变陡。这里展示了使用 e-MERLIN 的 V959 Mon 的高分辨率射电图像，在 2012 年 9 月至 2014 年 2 月之间的六个时期显示了源的形态演化。虽然 V959 Mon 的早期 e-MERLIN 观测显示喷射物形态呈东西向拉长，但随后的观测表明喷射物在南北方向上拉长。
我们对 V959 Mon 结构这一令人惊讶的演化的高分辨率观察可以帮助我们进一步了解新星喷射物的行为和形态。
V959 Mon (Nova Mon 2012) was first detected by the Fermi Large Area Telescope in June 2012, as a transient gamma-ray source. Subsequent optical observations showed that this gamma-ray emission was due to a classical nova explosion. Multifrequency observations of V959 Mon with the Very Large Array (VLA) between 2012 June and September revealed dramatic brightening, and a spectrum that steepened with increasing frequency. High-resolution radio images of V959 Mon using e-MERLIN are presented here, at six epochs between 2012 September and 2014 February that show morphological evolution of the source. While early e-MERLIN observations of V959 Mon showan east–west elongation in the ejecta morphology, subsequent observations suggest that the ejecta become elongated in the north–south direction.
Our high-resolution observations of this surprising evolution in the structure of V959 Mon can assist us in further understanding the behaviour and morphology of nova ejecta.