Probing Jets from Young Embedded Sources: Clues from HST Near-IR [Fe ii] Images
Probing Jets from Young Embedded Sources: Clues from HST Near-IR [Fe ii] Images
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从年轻嵌入式光源探测喷气机：来自 HST 近红外 [Fe ii] 图像的线索
DOI：
10.3847/1538-4357/ac06c5
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发表时间：
2021
期刊：
影响因子：
--
通讯作者：
C. Manara
中科院分区：
文献类型：
--
作者：
J. Erkal;B. Nisini;D. Coffey;F. Bacciotti;P. Hartigan;S. Antoniucci;T. Giannini;J. Eislöffel;C. Manara
我们展示了用哈勃太空望远镜（HST）宽视场相机3观测到的4个0/I类喷流（HH 1/2, HH 34, HH 111, HH 46/47）的近红外[Fe ii]图像。前所未有的角度分辨率使我们能够测量适当的运动，射流宽度和轨迹，以及沿射流的消光。在所有情况下，我们都能探测到反喷流，它在较短的波长下几乎不可见或不可见。我们测量的切向速度为每秒几百公里，与10多年前的HST测量结果一致。我们在距离恒星近几十个天文单位的地方测量了喷流的宽度，发现HH 1、HH 34和HH 111的高度准直度约为2°，HH 46的高度准直度约为8°，所有这些都被保存到很远的地方。对于HH 34，我们发现了更大的初始开口角约7°的证据。结点位置的测量揭示了所有源的射流和反射流的轨迹偏差。对HH 111内部结位置的不对称分析表明，在距离20-30 au的地方存在一颗低质量恒星伴星。最后，我们发现震源附近的消光值为15 ~ 20等，沿射流向下游移动逐渐减小。这些观测使我们能够以前所未有的高角度分辨率研究反喷流，并将为规划未来JWST中红外观测提供有价值的参考，这些观测将更近距离地观察喷气发动机。
We present near-infrared [Fe ii] images of four Class 0/I jets (HH 1/2, HH 34, HH 111, HH 46/47) observed with the Hubble Space Telescope (HST) Wide Field Camera 3. The unprecedented angular resolution allows us to measure proper motions, jet widths and trajectories, and extinction along the jets. In all cases, we detect the counterjet, which was barely visible or invisible at shorter wavelengths. We measure tangential velocities of a few hundred kilometers per second, consistent with previous HST measurements over 10 years ago. We measure the jet width as close as a few tens of au from the star, revealing high collimations of about 2° for HH 1, HH 34, and HH 111 and about 8° for HH 46, all of which are preserved up to large distances. For HH 34, we find evidence of a larger initial opening angle of about 7°. Measurement of knot positions reveals deviations in trajectory of both the jet and counterjet of all sources. Analysis of asymmetries in the inner knot positions for HH 111 suggests the presence of a low mass stellar companion at separation 20–30 au. Finally, we find extinction values of 15–20 mag near the source, which gradually decrease moving downstream along the jet. These observations have allowed us to study the counterjet at unprecedentedly high angular resolution and will be a valuable reference for planning future JWST mid-infrared observations that will peer even closer into the jet engine.
由包络吸积驱动的嵌入式原恒星盘中的螺旋结构
影响因子：
14.1
作者：
Lee, Chin-Fei;Li, Zhi-Yun;Turner, Neal J.
通讯作者：
Turner, Neal J.