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首页> 外文期刊>The Astrophysical Journal. Letters >ALMA 690 GHz observations of IRAS 16293-2422B: Infall in a highly optically thick disk
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ALMA 690 GHz observations of IRAS 16293-2422B: Infall in a highly optically thick disk

机译：IRAS 16293-2422B的ALMA 690 GHz观测值：侵入高度光学厚度的磁盘

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摘要

We present sensitive, high angular resolution (～0.″2) submillimeter continuum and line observations of IRAS 16293-2422B made with the Atacama Large Millimeter/Submillimeter Array. The 0.45 mm continuum observations reveal a single and very compact source associated with IRAS 16293-2422B. This submillimeter source has a deconvolved angular size of about 400 mas (50 AU) and does not show any inner structure inside of this diameter. The H ~(13)CN, HC~(15)N, and CH_3OH line emission regions are about twice as large as the continuum emission and reveal a pronounced inner depression or "hole" with a size comparable to that estimated for the submillimeter continuum. We suggest that the presence of this inner depression and the fact that we do not see an inner structure (or a flat structure) in the continuum are produced by very optically thick dust located in the innermost parts of IRAS 16293-2422B. All three lines also show pronounced inverse P-Cygni profiles with infall and dispersion velocities larger than those recently reported from observations at lower frequencies, suggesting that we are detecting faster and more turbulent gas located closer to the central object. Finally, we report a small east-west velocity gradient in IRAS 16293-2422B that suggests that its disk plane is likely located very close to the plane of the sky.
机译：我们展示了用Atacama大毫米波/亚毫米波阵列制作的IRAS 16293-2422B的灵敏，高角分辨率（〜0。″ 2）亚毫米连续谱和线观测。 0.45毫米连续观测表明，与IRAS 16293-2422B相关的单一且非常紧凑的来源。该亚毫米源的反卷角大小约为400 mas（50 AU），在该直径范围内未显示任何内部结构。 H〜（13）CN，HC〜（15）N和CH_3OH线发射区域大约是连续发射的两倍，并显示出明显的内部凹陷或“孔”，其大小可与亚毫米连续发射的估计值相媲美。 。我们建议，这种内部凹陷的存在以及在连续体中看不到内部结构（或平坦结构）的事实是由位于IRAS 16293-2422B最内部的非常光学上较厚的尘埃产生的。所有这三条线还显示出明显的P-Cygni逆剖面，其入射和分散速度大于最近在较低频率下的观测所报告的速度，这表明我们正在检测到更靠近中心物体的更快且更湍流的气体。最后，我们在IRAS 16293-2422B中报告了一个小的东西向速度梯度，这表明它的磁盘平面可能非常靠近天空平面。

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