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arXiv 1105.3496astro-ph.GA
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与IRAS 16562-3959有关的电离喷流驱动的热分子外流

A hot molecular outflow driven by the ionized jet associated with IRAS 16562-3959

A. E. Guzmán, G. Garay, K. J. Brooks, J. Rathborne, R. Güsten

备注：
Accepted for publication in the ApJ
发表信息：
ApJ, 736, 150, (2011)
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摘要：

我们报告的CO J=3 $\rightarrow$ 2，6 $\rightarrow$ 5和7 $\rightarrow$ 6跃迁的分子线观测，使用阿塔卡马探路者实验望远镜（APEX），向大质量和致密的核心IRAS 16562 $-$ 3959。这个核心拥有一串无线电源，被认为是由电离气体的中央准直射流提供动力。分子观测表明，存在的高速气体表现出四极形态，最有可能产生的存在下，两个准直的流出。东南-西北方向的分子外流与无线电连续源的弦对齐，表明它是由喷流驱动的。我们发现，在东南-西北流出的气体的激发温度高，蓝移和红移的瓣，分别为145和120 K的值。这个外流的总质量为1.92 \Msun，总动量为$\sim 89$ \Msun \kms，平均动量率为$\sim 3.0\times10^{-2}$ \Msun \kms yr $^{-1}$，数值特征是由具有高光度的年轻大质量恒星天体（$L_{\rm bol} \sim 2\times10^4$ \Lsun）驱动的流动。阿塔卡马亚毫米望远镜实验（ASTE）在高密度和激波示踪剂中获得的补充数据支持IRAS 16562 $-$ 3959是一颗吸积的年轻大质量恒星，与电离喷流有关，这是分子外流的能量来源。

英文摘要：

We report molecular line observations in the CO J=3$\rightarrow$2, 6$\rightarrow$5 and 7$\rightarrow$6 transitions, made using the Atacama Pathfinder Experiment Telescope (APEX), toward the massive and dense core IRAS 16562$-$3959. This core harbors a string of radio sources thought to be powered by a central collimated jet of ionized gas. The molecular observations show the presence of high velocity gas exhibiting a quadrupolar morphology, most likely produced by the presence of two collimated outflows. The southeast-northwest molecular outflow is aligned with the string of radio continuum sources, suggesting it is driven by the jet. We find that the excitation temperature of the gas in the SE-NW outflow is high, with values of 145 and 120 K for the blueshifted and redshifted lobes, respectively. This outflow has a total mass of 1.92 \Msun, a total momentum of $\sim 89$ \Msun \kms and an averaged momentum rate of $\sim 3.0\times10^{-2}$ \Msun \kms yr$^{-1}$, values characteristics of flows driven by young massive stellar objects with high luminosities ($L_{\rm bol} \sim 2\times10^4$ \Lsun). Complementary data taken with the Atacama Submillimeter Telescope Experiment (ASTE) in high density and shock tracers support the picture that IRAS 16562$-$3959 is an accreting young massive star associated with an ionized jet, which is the energy source of a molecular outflow.

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