论文标题
探索与Uchii区域相关的紧凑型无线电的性质
Exploring the nature of compact radio sources associated to UCHII regions
论文作者
论文摘要
我们提出了非常大的阵列7 mm连续观测的四个超紧凑（UC）HII区域，以前在1.3 cm处观察到，以研究与这些区域相关的紧凑型无线电源的性质。我们总共检测到七个紧凑型无线电来源，其中四个具有热发射，两个紧凑型无线电源具有明显的非热发射。热发射与存在电离包膜的存在一致，即静态（即被困在相关的大型恒星的重力半径中）或流失（即光蒸发流）。另一方面，非热来源的性质尚不清楚，并提出了几种可能性。这些紧凑的无线电源中的大多数是光蒸发物体和其余的对象的可能性与先前对UCHII区域的研究一致。
We present Very Large Array 7 mm continuum observations of four Ultra-Compact (UC)HII regions, observed previously at 1.3 cm, in order to investigate the nature of the compact radio sources associated with these regions. We detected a total of seven compact radio sources, four of them with thermal emission, and two compact radio sources have clear non-thermal emission. The thermal emission is consistent with the presence of an ionized envelope, either static (i.e., trapped in the gravitational radius of an associated massive star) or flowing away (i.e., a photo-evaporative flow). On the other hand, the nature of the non-thermal sources remains unclear and several possibilities are proposed. The possibility that most of these compact radio sources are photo-evaporating objects and the remaining ones more-evolved objects is consistent with previous studies on UCHII regions.
