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首页> 外文期刊>The Astrophysical journal >A CLUSTER OF 1.3 CENTIMETER CONTINUUM SOURCES IN OMC-1 SOUTH
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A CLUSTER OF 1.3 CENTIMETER CONTINUUM SOURCES IN OMC-1 SOUTH

机译:南部OMC-1的1.3厘米连续性来源

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We present sensitive 1.3 cm radio continuum observations of the region OMC-1 South (OMC-1S) in Orion using the Very Large Array in its B configuration. We detect 11 radio sources clustered in a 30″ x 30″ region, of which only three had been detected previously at radio wavelengths in deep 3.6 cm observations. The eight new radio sources are compact (θ_s ≤ 0.1′), and we set lower limits to their spectral indices, α > 0.8 ± 0.3 (with S_v ∝ v~α), that suggest that they may be optically thick H II regions. However, one of the new sources exhibits significant circular polarization, indicating that gyrosynchrotron emission with large positive spectral indices may be an alternative explanation. Furthermore, we find that four other sources are associated with infrared sources of low bolometric luminosity that cannot drive an H II region. Finally, two of the sources previously detected at 3.6 cm are angularly resolved in the 1.3 cm image, and their major axes have position angles that align well with large-scale outflows emanating from OMC-1S. The radio source 143-353 has a major axis with a position angle consistent with those of the HH 202 and HH 528 flows, while the radio source 134 — 411 has a major axis with a position angle consistent with that of the low-velocity molecular outflow associated with the far-infrared source FIR 4.
机译:我们使用Oriental Array的B型结构,对Orion中的OMC-1 South(OMC-1S)区域进行了1.3厘米敏感的连续无线电观测。我们检测到11个聚集在30英寸x 30英寸区域的无线电源,其中在以前的3.6厘米深观测中,只有三个在无线电波长处被检测到。八个新的无线电源是紧凑的(θ_s≤0.1'),我们对其光谱指数设置了下限α> 0.8±0.3(S_v ∝ v〜α),这表明它们可能是光学上较厚的H II区域。然而,其中一种新的辐射源表现出显着的圆极化现象,表明具有大正光谱指数的陀螺回旋加速器发射可能是另一种解释。此外,我们发现其他四个源与无法驱动H II区域的低辐射热亮度红外源相关。最后,先前在3.6厘米处检测到的两个源在1.3厘米图像中被分解,其主轴的位置角与从OMC-1S发出的大规模流出物很好地对准。无线电源143-353具有与HH 202和HH 528流动的位置角一致的长轴,而无线电源134_411具有与低速分子的位置角一致的长轴。与远红外源FIR相关的流出4。

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