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arXiv 2303.01583astro-ph.SRastro-ph.GA
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水喷泉源IRAS 18043$-$2116外流的演化

Evolution of the outflow in the water fountain source IRAS 18043$-$2116

L. Uscanga, H. Imai, J. F. Gómez, D. Tafoya, G. Orosz, T. P. McCarthy, Y. Hamae, K. Amada

AI总结:

本研究通过观测水喷泉源IRAS 18043$-$2116的H$_2$O脉泽,发现速度跨度约540 km/s的快速外流,张角约60度,时间尺度约30年,并确认连续谱增强,探讨了其向行星状星云演化的过程。

摘要:

我们展示了在日本野边山45米望远镜和澳大利亚望远镜致密阵列观测中发现的与水喷泉源IRAS 18043$-$2116相关的H$_2$O脉泽的光谱和空间演化。我们发现了H$_2$O脉泽新的最高速度分量(红移侧$V_{\rm LSR}\simeq376~\mathrm{km~s}^{-1}$,蓝移侧$V_{\rm LSR}\simeq$ $-165~\mathrm{km~s}^{-1}$),由此产生的速度跨度约为$\simeq 540~\mathrm{km~s}^{-1}$,打破了此类源中快速喷流/外流的速度记录。这些分量的位置相对于连接两个主要脉泽团的轴有偏移,表明外流具有较大的张角($\sim60^{\circ}$)。脉泽团分离的演化速度约为$\sim$2.9 mas yr$^{-1}$,以及用阿塔卡马大型毫米/亚毫米阵列测绘到的致密($\sim0.''2$)CO发射源,表明外流的时间尺度非常短($\sim$30年)。我们还确认了22 GHz连续谱源的流量密度增加。喷流和连续谱源的性质及其在向行星状星云阶段过渡中可能的演化得到了进一步讨论。

英文摘要:

We present the spectral and spatial evolution of H$_2$O masers associated with the water fountain source IRAS 18043$-$2116 found in the observations with the Nobeyama 45 m telescope and the Australia Telescope Compact Array. We have found new highest velocity components of the H$_2$O masers (at the red-shifted side $V_{\rm LSR}\simeq376~\mathrm{km~s}^{-1}$ and at the blue-shifted side $V_{\rm LSR}\simeq$ $-165~\mathrm{km~s}^{-1}$), and the resulting velocity spread of $\simeq 540~\mathrm{km~s}^{-1}$ breaks the speed record of fast jets/outflows in this type of sources. The locations of those components have offsets from the axis joining the two major maser clusters, indicating a large opening angle of the outflow ($\sim60^{\circ}$). The evolution of the maser cluster separation of $\sim$2.9 mas yr$^{-1}$ and the compact ($\sim0.''2$) CO emission source mapped with the Atacama Large Millimeter-submillimeter Array suggest a very short ($\sim$30 yr) timescale of the outflow. We also confirmed the increase in the flux density of the 22 GHz continuum source. The properties of the jet and the continuum sources and their possible evolution in the transition to the planetary nebula phase are further discussed.

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