天鹅座X-3周围微弱的弧分扩展射电发射
Faint arc-minute extended radio emission around Cygnus X-3
摘要：
目标。我们在无线电波长上重新审视了微类星体天鹅座X-3的附近。我们的目标是改善我们以前的搜索可能相关的扩展无线电功能/热点的位置角的天鹅座X-3相对论性喷流集中在较短的角尺度比以前探索。方法.我们的工作主要是基于分析现代调查和档案无线电数据，主要包括使用甚大阵列和赖尔望远镜进行的观测。我们还使用了2005年获得的深近红外图像。结果我们提出了新的无线电地图的天鹅座X-3领域的计算后，结合多配置甚大阵列档案数据在6厘米和不同的观测运行在2厘米的赖尔望远镜。这些可能是迄今为止报道的天鹅座X-3在厘米波长下最深的无线电图像之一。这两个干涉仪揭示了一个扩展的无线电功能在几个弧分的微类星体的位置，从而使我们的探测更可信。此外，这种扩展的发射可能是非热的，尽管这一点仍然需要确认。在不同的物理情景下，初步考虑了它与微类星体的物理联系。我们还报告了一个可能的Fanaroff-Riley II型射电星系的偶然发现，距离天鹅座X-3只有3弧分。
英文摘要：
Aims. We revisit the vicinity of the microquasar Cygnus X-3 at radio wavelengths. We aim to improve our previous search for possible associated extended radio features/hot spots in the position angle of the Cygnus X-3 relativistic jets focusing on shorter angular scales than previously explored. Methods. Our work is mostly based on analyzing modern survey and archive radio data, mainly including observations carried out with the Very Large Array and the Ryle Telescopes. We also used deep near-infrared images that we obtained in 2005. Results. We present new radio maps of the Cygnus X-3 field computed after combining multi-configuration Very Large Array archive data at 6 cm and different observing runs at 2 cm with the Ryle Telescope. These are probably among the deepest radio images of Cygnus X-3 reported to date at cm wavelengths. Both interferometers reveal an extended radio feature within a few arc-minutes of the microquasar position, thus making our detection more credible. Moreover, this extended emission is possibly non-thermal, although this point still needs confirmation. Its physical connection with the microquasar is tentatively considered under different physical scenarios. We also report on the serendipitous discovery of a likely Fanaroff-Riley type II radio galaxy only 3 arc-minute away from Cygnus X-3.
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