arXiv 1804.016732018-04-05astro-ph.GAastro-ph.SR

LkH $α$ 234周围多个流出物的H $_{2}$和[Fe II ]线的高分辨率近红外光谱图

High-resolution near-IR Spectral mapping with H$_{2}$ and [Fe II] lines of Multiple Outflows around LkH$α$ 234

Heeyoung Oh, Tae-Soo Pyo, Bon-Chul Koo, In-Soo Yuk, Kyle F. Kaplan, Yong-Hyun Lee, Kimberly Sokal, Gregory Mace, Chan Park, Jae-Joon Lee, Byeong-Gon Park, Narae… 展开作者

Heeyoung Oh, Tae-Soo Pyo, Bon-Chul Koo, In-Soo Yuk, Kyle F. Kaplan, Yong-Hyun Lee, Kimberly Sokal, Gregory Mace, Chan Park, Jae-Joon Lee, Byeong-Gon Park, Narae Hwang, Hwihyun Kim, Daniel T. Jaffe

备注：: 32 pages, 12 figures, 2 tables, Accepted for publication in the Astrophysical Journal
DOI：: 10.3847/1538-4357/aabba4

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摘要：

我们提出了一个高分辨率，近红外光谱研究的多个外流在LkH $α$ 234恒星形成区使用浸没光栅红外光谱仪（IGRINS）。光谱映射的蓝移发射的HH 167使我们能够区分至少三个独立的，空间重叠，流出的H ${_2}$和[Fe II]的排放。我们发现，H ${_2}$排放代表不是一个单一的射流，但复杂的多个外流驱动的三个已知的嵌入源：MM 1，VLA 2，和VLA 3。相对于$\VLSR$ $=$ $-$ 11.5 { \kms }的系统速度，有一个低速的红移H ${_2}$外流，$\VLSR$ $<$ $+$ 50 { \kms }，这与早期射电观测中在VLA 2西南两角秒处看到的H ${_2}$ O脉泽相一致。我们发现，以前检测到的[Fe II]喷流与$|$ $\VLSR$ $|$ $>$ 100 { \kms }驱动的VLA 3 B也检测到H ${_2}$发射，并确认该喷流具有约240 $\degree$的位置角。首次给出了LkH $α$ 234东北方14 $\arcsec$ $-$ 65 $\arcsec$的红移结的光谱。这些光谱也提供了存在多个外流的线索。我们在LkH $α$ 234周围的多个流出物中检测到高速（50 $-$ 120 { \kms }）H ${_2}$气体。由于这些气体以远高于离解速度（$>$ 40 { \kms }）的速度移动，因此发射必须源自射流本身，而不是环境介质中的H ${_2}$气体。另外，位置-速度图和激发图表明，HH 167中C结的辐射来自两种不同的现象：激波和光解。

英文摘要：

We present a high-resolution, near-IR spectroscopic study of multiple outflows in the LkH$α$ 234 star formation region using the Immersion GRating INfrared Spectrometer (IGRINS). Spectral mapping over the blueshifted emission of HH 167 allowed us to distinguish at least three separate, spatially overlapped, outflows in H${_2}$ and [Fe II] emission. We show that the H${_2}$ emission represents not a single jet, but complex multiple outflows driven by three known embedded sources: MM1, VLA 2, and VLA 3. There is a redshifted H${_2}$ outflow at a low velocity, $\VLSR$ $<$ $+$50 {\kms}, with respect to the systemic velocity of $\VLSR$ $=$ $-$11.5 {\kms}, that coincides with the H${_2}$O masers seen in earlier radio observations two arcseconds southwest of VLA 2. We found that the previously detected [Fe II] jet with $|$$\VLSR$$|$ $>$ 100 {\kms} driven by VLA 3B is also detected in H${_2}$ emission, and confirm that this jet has a position angle about 240$\degree$. Spectra of the redshifted knots at 14$\arcsec$$-$65$\arcsec$ northeast of LkH$α$ 234 are presented for the first time. These spectra also provide clues to the existence of multiple outflows. We detected high-velocity (50$-$120 {\kms}) H${_2}$ gas in the multiple outflows around LkH$α$ 234. Since these gases move at speeds well over the dissociation velocity ($>$ 40 {\kms}), the emission must originate from the jet itself rather than H${_2}$ gas in the ambient medium. Also, position-velocity diagrams and excitation diagram indicate that emission from knot C in HH 167 come from two different phenomena, shocks and photodissociation.

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