DEEP IMAGING SURVEYS OF STAR-FORMING CLOUDS. V. NEW HERBIG–HARO SHOCKS AND GIANT OUTFLOWS IN TAURUS
DEEP IMAGING SURVEYS OF STAR-FORMING CLOUDS. V. NEW HERBIG–HARO SHOCKS AND GIANT OUTFLOWS IN TAURUS
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恒星形成云的深度成像调查。V. 新的赫比格-哈罗冲击和金牛座的巨大外流
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发表时间：
2012
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通讯作者：
B. Reipurth
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作者：
J. Bally;J. Walawender;B. Reipurth
我们报道在金牛座分子云复合体的东南部发现了新的HerBig-Haro激波。嵌入其中的原恒星IRAS04325+2402位于B18暗云的东端，位于被称为L1535的云区，它驱动着一条至少134‘(5.5pc)长的秒级流出，流向P.A.=17°/197°，这是迄今为止在金牛座发现的最大的原恒星流出。这股气流的南端距离IRAS源约65‘(∼2.7pc)，由先前发现的大激波HH434-436组成。北半球有三次微弱的地震，最远的一次是震源以北2.8pc的HH696。在IRAS源和HH434-436之间发现了两个较小的激波，HH699和HH703。HH703的自行S−1向P.A.=195°±10°。此外，我们还报告了在B18和IC2087附近发现了十几个追踪流出和原恒星喷流的新的HerBig-Haro天体，其中至少有两个也达到了秒尺度。这些观测表明，一些由金牛座星云形成的低质量恒星驱动着巨大的气流，可以在距其来源中等度的云间激发激波，为原恒星外流产生大范围质量运动和湍流提供了进一步的证据。
We report the discovery of new Herbig–Haro shocks in the southeastern portion of the Taurus molecular cloud complex. The embedded protostar IRAS04325+2402, located in the eastern end of the B18 dark cloud in the cloud region known as L1535, drives a parsec-scale outflow with a length of at least 134′ (5.5 pc) toward P.A. = 17°/197° making this the largest protostellar outflow found thus far in Taurus. The southern terminus of this flow located about 65′ (∼2.7 pc) from the IRAS source consists of a large previously discovered shock, HH 434–436. The northern lobe contains three faint shocks with the most distant being HH 696 located 2.8 pc north of the source. Two smaller shocks, HH 699 and HH 703, are found midway between the IRAS source and HH 434–436. HH 703 has a proper motion of 170 ± 30 km s−1 toward P.A. = 195° ± 10°. Additionally, we report the discovery of a dozen new Herbig–Haro objects tracing outflows and protostellar jets in B18 and near IC 2087, at least two of which have also attained parsec-scale dimensions. These observations demonstrate that some low-mass stars forming from the Taurus clouds drive giant flows which can excite shocks in the inter-cloud medium degrees from their sources, providing further evidence for the generation of large-scale mass motions and turbulence by protostellar outflows.