论文标题
一列3000 au量表的冲击火车？探索向NGC 1333 IRAS 4地区扩展气泡的冲突。 Solis XIV
A train of shocks at 3000 au scale? Exploring the clash of an expanding bubble into the NGC 1333 IRAS 4 region. SOLIS XIV
论文作者
论文摘要
有证据表明，恒星形成过程与分子云中细丝的复杂净相关，这也可能是由于外部触发器的气体压缩所致。我们研究了珀尔修斯NGC 1333分子云的南部区域，该云被相似的外部触发器塑造了很大的形状，以阐明扰动0级IRAS4 Protostars所在的细丝的过程。我们将新的IRAM-NOEMA对SIO和CH3OH的观察结果（都称为暴力事件是冲击事件），这是IRAS 4A，作为太空中生命的大型生命种子（SOLIS）的一部分。我们检测到三个平行拉长（$> $ 6000 au）的结构，称为手指，具有狭窄的线轮廓（〜1.5 $ km s^{ - 1} $）在云的系统性速度上达到峰值，跟踪具有高密度的气体（5-20美元$ 10^5 cm^{ - 3} $）和高温（80-160 K）。它们在化学上是不同的，北指的是Sio和Ch3OH（[CH3OH]/[SIO] 〜160-300），而另外两个仅由Sio（[CH3OH]/[SIO] $ <$ <$ 40）。 Among various possibilities, a train of three shocks, distanced by $>$5000 yr, would be consistent with the observations if a substantial fraction of silicon, frozen onto the grain mantles, is released by the shocks.We suggest that the shock train is due to an expanding gas bubble, coming behind NGC 1333 from the southwest and clashing against the filament, where IRAS 4A lies.最后，我们提出了一个解决方案，该解决方案是关于在NGC 1333的南部观察到的广泛狭窄SIO发射的性质和起源的长期辩论，即是由于未解决的冲击火车。
There is evidence that the star formation process is linked to the intricate net of filaments in molecular clouds, which may be also due to gas compression from external triggers. We studied the southern region of the Perseus NGC 1333 molecular cloud, known to be heavily shaped by similar external triggers, to shed light on the process that perturbed the filament where the Class 0 IRAS4 protostars lie. We use new IRAM-NOEMA observations of SiO and CH3OH, both known to trace violent events as shocks, toward IRAS 4A as part of the Large Program Seeds Of Life in Space (SOLIS). We detected three parallel elongated ($>$6000 au) structures, called fingers, with narrow line profiles (~1.5 $km s^{-1}$) peaked at the cloud systemic velocity, tracing gas with high density (5-20 $10^5 cm^{-3}$) and high temperature (80-160 K). They are chemically different, with the northern finger traced by both SiO and CH3OH ([CH3OH]/[SiO]~160-300), while the other two only by SiO ([CH3OH]/[SiO]$<$ 40). Among various possibilities, a train of three shocks, distanced by $>$5000 yr, would be consistent with the observations if a substantial fraction of silicon, frozen onto the grain mantles, is released by the shocks.We suggest that the shock train is due to an expanding gas bubble, coming behind NGC 1333 from the southwest and clashing against the filament, where IRAS 4A lies. Finally, we propose a solution to the two-decades long debate on the nature and origin of the widespread narrow SiO emission observed in the south part of NGC 1333, namely that it is due to unresolved trains of shocks.
