来自东西向原恒星喷流 RAFGL2591 的秒差距尺度新射电瓣
New radio lobes at parsec scale from the East-West protostellar jet RAFGL2591
AI总结：
本文利用 GMRT 在 325、610 和 1280 MHz 首次探测到 RAFGL2591 东西向原恒星喷流的秒差距尺度射电瓣，结合 H₂ 发射和数值模型揭示了热与非热混合辐射、数密度及约 20° 弯曲的反射对称错位，并归因于双星进动或侧风作用。
摘要：
RAFGL2591 是 Cygnus-X 区域中的一个高质量恒星形成复合体，由一群嵌入的原恒星和年轻恒星天体组成，距离为 3.33 kpc。我们利用巨米波射电望远镜（GMRT）在 325、610 和 1280 MHz 频率上研究了与 RAFGL2591 相关的原恒星喷流的低频射电辐射。我们首次探测到东西方向的射电喷流瓣，标记为 GMRT-1 和 GMRT-2。GMRT-1 显示出平坦的射电谱指数 α = -0.10，而 GMRT-2 显示出陡峭的负值 α = -0.62，表明存在非热辐射。H₂ 发射图显示在东西向喷流方向上存在大量节点、弧状结构和延展发射，这些结构由原恒星 VLA 3 激发。此外，我们首次报告了东北和西南方向的若干 H₂ 节点。该区域的射电瓣（GMRT-1、GMRT-2）和 H₂ 发射可以在显著的东西向喷流及其较不为人知的东北-西南方向姊妹喷流的背景下理解。为了模拟射电瓣的射电辐射，我们采用了一个同时包含热辐射和非热辐射的数值模型，发现这些射电瓣的数密度在 100 - 1000 cm⁻³ 范围内。东西向喷流瓣的错位表现出反射对称性，弯曲角度约为 20°。我们尝试通过双星伴星引起的进动和/或来自附近源的超音速侧风来理解这种错位。
英文摘要：
RAFGL2591 is a massive star-forming complex in the Cygnus-X region comprising of a cluster of embedded protostars and young stellar objects located at a distance of 3.33 kpc. We investigate low-frequency radio emission from the protostellar jet associated with RAFGL2591 using the Giant Metrewave Radio Telescope (GMRT) at 325, 610 and 1280 MHz. For the first time, we have detected radio jet lobes in the E-W direction, labelled as GMRT-1 and GMRT-2. While GMRT-1 displays a flat radio spectral index of $α$ = -0.10 , GMRT-2 shows a steeply negative value $α$ = -0.62 suggestive of non-thermal emission. H$_2$ emission maps show the presence of numerous knots, arcs and extended emission towards the East-West jet, excited by the protostar VLA 3. In addition, we report a few H$_2$ knots in the North-East and South-West for the first time. The radio lobes (GMRT-1, GMRT-2) and H$_2$ emission towards this region are understood in the context of the prominent East-West jet as well as its lesser-known sibling jet in the North-East and South-West direction. To model the radio emission from the lobes, we have employed a numerical model including both thermal and non-thermal emission and found number densities towards these lobes in the range 100 - 1000 cm$^{-3}$ . The misalignment of the East-West jet lobes exhibits a reflection symmetry with a bending of $\sim$ 20$\circ$ . We attempt to understand this misalignment through precession caused by a binary partner and/or a supersonic side wind from source(s) in the vicinity.
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