猎户座BN/KL 42.3-43.6 GHz光谱测量：首次探测到同位素体29 SiO和30 SiO的v=0 J=1-0线
A 42.3-43.6 GHz spectral survey of Orion BN/KL: First detection of the v=0 J=1-0 line from the isotopologues 29SiO and 30SiO
摘要：
我们用绿岸望远镜观测了猎户座BN/KL在42.3 - 43.6GHz的分子谱线发射。鉴定了67个品系，并将其归因于13个不同的分子物种。7 mm处的光谱主要由SiO、SO2、CH 3 OCH 3和C2 H5 CN组成。从SiO同位素28 SiO、29 SiO和30 SiO中检测到五个跃迁。本文首次报道了Orion BN/KL中29 SiO和30 SiO v=0 J=1-0发射的光谱，并表明它们具有双峰分布，速度范围与主要同位素相似。调查的主要动机是寻找由SiO多普勒成分追踪的BN/KL区域的高速（100-1000公里/秒）外流。原则上，一些未识别的线条可能是高速SiO特征，但如果没有成像数据，则无法确定其位置。在v=0的28 SiO、29 SiO和30 SiO剖面中存在发射翼，我们认为这三种同位素的v=0发射可能追踪猎户座BN/KL区高质量原恒星源I周围气流的中等高速（~30-50 km/s）分量。我们还确认了7毫米的检测复杂的含氧物种，丙酮（CH 3COCH 3），这是最近观察到的热核心在3毫米，我们已经发现了进一步的迹象存在的长期cyanopolyynes（HC 5 N和HC 7 N）在静态冷气体的扩展脊。
英文摘要：
We have surveyed molecular line emission from Orion BN/KL from 42.3 to 43.6 GHz with the Green Bank Telescope. Sixty-seven lines were identified and ascribed to 13 different molecular species. The spectrum at 7 mm is dominated by SiO, SO2, CH3OCH3, and C2H5CN. Five transitions have been detected from the SiO isotopologues 28SiO, 29SiO, and 30SiO. We report here for the first time the spectra of the 29SiO and 30SiO v=0 J=1-0 emission in Orion BN/KL, and we show that they have double-peaked profiles with velocity extents similar to the main isotopologue. The main motivation for the survey was the search of high-velocity (100-1000 km/s) outflows in the BN/KL region as traced by SiO Doppler components. Some of the unidentified lines in principle could be high-velocity SiO features, but without imaging data their location cannot be established. Wings of emission are present in the v=0 28SiO, 29SiO and 30SiO profiles, and we suggest that the v=0 emission from the three isotopologues might trace a moderately high-velocity (~30-50 km/s) component of the flows around the high-mass protostar Source I in the Orion BN/KL region. We also confirm the 7 mm detection of a complex oxygen-bearing species, acetone (CH3COCH3), which has been recently observed towards the hot core at 3 mm, and we have found further indications of the presence of long cyanopolyynes (HC5N and HC7N) in the quiescent cold gas of the extended ridge.
机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。
