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Line Imaging of Orion KL at 865 μm with the Submillimeter Array

机译:亚毫米级阵列在865μm处对Orion KL进行线成像

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摘要

[[abstract]]We present the first submillimeter (865 mu m) imaging spectral line survey at 1 '' resolution conducted with the Sub-millimeter Array toward Orion KL. Within the 2 x 2 GHz bandpasses ( lower and upper sidebands, 337.2 - 339.2 and 347.2 - 349.2 GHz), we find about 145 spectral lines from 13 species, six isotopologues, and five vibrational excited states. Most nitrogen-bearing molecules are strong toward the hot core, whereas the oxygen-bearing molecules peak toward the southwest in the so-called compact ridge. Imaging of spectral lines is shown to be an additional tool to improve the identifications of molecular lines. Arcsecond spatial resolution allows us to distinguish the molecular line emission of the sources I and n from that of the hot core. The only molecular species detected strongly toward source I is SiO, delineating mainly the collimated northeast- southwest low- velocity outflow. The two positions close to source I, which have previously been reported to show maser emission in the v = 0 (SiO)-Si-28 (1 - 0) and (2 - 1) lines, show no detectable maser emission in the v =0 (SiO)-Si-28 (8 - 7) line at our spatial resolution. SiO is weak toward source n, and thus source n may not currently be driving a molecular outflow. CH3OH is the molecule with the highest number of identified lines (46) in this spectral window. This ''line forest'' allows us to estimate temperatures in the region, and we find temperatures between 50 and 350 K, with the peak temperatures occurring toward the hot core. The detection of strong vibrational excited line emission from the
机译:[[摘要]]我们提出了使用亚毫米波阵列对Orion KL进行的第一次亚毫米(865微米)成像光谱线调查,分辨率为1英寸。在2 x 2 GHz带通(下边带和上边带,分别为337.2-339.2和347.2-349.2 GHz)中,我们发现了来自13种,六个同位素和五个振动激发态的约145条谱线。大多数含氮分子在热核中很强,而含氧分子在所谓的致密脊中向西南峰。光谱线成像显示为改善分子线识别的另一工具。 Arcsecond空间分辨率使我们能够区分源I和源n与热核源的分子线发射。对源I强烈检测到的唯一分子种类是SiO,主要描绘了准直的东北-西南低速流出。先前已报道,靠近源I的两个位置在v = 0(SiO)-Si-28(1-0)和(2-1)线中显示出maser发射,但在v中没有可检测到的maser发射。在我们的空间分辨率下,= 0(SiO)-Si-28(8-7)线。 SiO对源n较弱,因此源n当前可能不会驱动分子流出。 CH3OH是在此光谱窗口中具有最高识别线数(46)的分子。这种“线林”使我们能够估计该地区的温度,发现温度在50到350 K之间,峰值温度朝着热核。检测来自强振动激发线的

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    Beuther H;

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  • 年度 2011
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  • 原文格式 PDF
  • 正文语种 [[iso]]en
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