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arXiv 2008.03466astro-ph.GAastro-ph.SR
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HH 32恒星喷流的发射线数据管

Emission-Line Datacubes of the HH 32 Stellar Jet

Patrick Hartigan, Lynne Hillenbrand, Matuesz Matuszewski, Arlindo Chan Borges, James D. Neill, D. Christopher Martin, Patrick Morrissey, Anna M. Moore

摘要:

我们分析了60多个发射线的HH 32恒星喷流与凯克宇宙网络成像仪(KCWI)获得的数据管。这些数据覆盖了3586 A和6351 A之间的光谱中较少探索的蓝色部分,并且具有高光谱(R $\sim$ 10000)和空间($\lesssim$ 1”)分辨率。该研究包括氧的所有三种主要电离状态,三条巴耳末线,Fe II和Fe III的多条线,以及首次获得的重要非混合诊断线,如He II $λ$ 4686,Ca I $λ$ 3933和Mg I] $λ$ 4571。数据立方体通常根据激发进行分类,并且具有从最高激发离子(He II、O III)通过中间激发离子(O I和H I)到最低激发离子(Ca II和Mg I)的相对连续的进程。合并KCWI立方体与HST图像导致几个新的见解的流动,包括弓形激波,部分弓形激波,马刺冲击,马赫盘,射流偏转激波,摆动射流,和潜在的冲击前兆的证据。最令人惊讶的结果是,Fe II在马赫盘中的速度分量之一的通量相对于其他线突然增加了两倍,这意味着马赫盘蒸发了喷流中的灰尘。因此,喷流必须加速或夹带尘埃到超过300公里/秒的速度,而不会破坏颗粒。

英文摘要:

We analyze datacubes of over 60 emission lines in the HH 32 stellar jet acquired with the Keck Cosmic Web Imager (KCWI). The data cover the less-explored blue portion of the spectrum between 3586A and 6351A , and have both high spectral (R $\sim$ 10000) and spatial ($\lesssim$ 1" ) resolution. The study includes all three major ionization states of oxygen, three Balmer lines, multiple lines of Fe II and Fe III, as well as the first datacubes ever acquired for important unblended diagnostic lines such as He II $λ$4686, Ca I $λ$3933, and Mg I] $λ$4571. The data cubes generally sort according to excitation, and have a relatively continuous progression from the highest-excitation ions (He II, O III) through the intermediate-excitation ions (O I and H I) to the lowest-excitation ions (Ca II and Mg I). Merging the KCWI cubes with HST images leads to several new insights about the flow, including evidence for bow shocks, partial bow shocks, spur shocks, Mach disks, jet deflection shocks, a wiggling jet, and potential shock precursors. The most surprising result is that one of the velocity components of Fe II in the Mach disk suddenly increases in flux relative to other lines by a factor of two, implying that the Mach disk vaporizes dust in the jet. Hence, jets must accelerate or entrain dust to speeds of over 300 km/s without destroying the grains.

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