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TRACING THE SHOCK PRECURSORS IN THE L1448-mm/IRS 3 OUTFLOWS

机译:跟踪L1448-mm / IRS 3流量中的冲击前兆

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We present the detection of the SiO v = 0, J = 2-1, and J = 3-2 lines and of the HCO 1_(01)-0_(00), J = 3/2-1/2, F = 2-1 line at ambient velocities toward the molecular outflows in L1448-mm and L1448 IRS 3. This is the first detection of HCO in a dark cloud. We have also measured lines of H~(13)CO~+, H~(13)CN, HN~(13)C, CH_3OH, and N_2H~+. While the HCO and the SiO lines have the narrowest profiles with line widths of ~0.5 km s~(-1), the other lines have widths of ~1 km s~(-1). Toward L-1448-mm, all lines except those of SiO and HCO show two distinct velocity components centered at 4.7 and 5.2 km s~(-1). HCO is only observed in the 4.7 km s~(-1) cloud and SiO in the 5.2 km s~(-1) component. The SiO abundance is ~10~(-11) in the 5.2 km s~(-1) clouds, 1 order of magnitude larger than in the 4.7 km s~(-1) component and in other dark clouds. The HCO abundance is ~10~(-11), similar to that predicted by the ion-molecule reactions models for the quiescent gas in dark clouds. The large change in the SiO/HCO abundance ratio ( > 150) from the 4.7 to the 5.2 km s~(-1) component, and the distribution and kinematics of the SiO emission toward L1448-mm suggest that the ambient SiO is associated with the molecular outflows. We propose that the narrow line widths and the abundances of SiO in the ambient gas are produced by the interaction of the magnetic and/or radiative precursors of the shocks with the clumpy preshocked ambient gas.
机译:我们介绍了SiO v = 0,J = 2-1和J = 3-2线以及HCO 1_(01)-0_(00),J = 3 / 2-1 / 2,F =在环境速度下,2-1线朝向L1448-mm和L1448 IRS 3中的分子流出。这是在暗云中首次检测到HCO。我们还测量了H〜(13)CO〜+,H〜(13)CN,HN〜(13)C,CH_3OH和N_2H〜+的谱线。 HCO和SiO线的轮廓最窄,线宽为〜0.5 km s〜(-1),其他线的宽度为〜1 km s〜(-1)。在L-1448-mm处,除SiO和HCO以外的所有线都表现出以4.7和5.2 km s〜(-1)为中心的两个明显的速度分量。仅在4.7 km s〜(-1)云中观测到HCO,而在5.2 km s〜(-1)成分中观测到SiO。 5.2 km s〜(-1)云中的SiO丰度为〜10〜(-11),比4.7 km s〜(-1)和其他暗云中的SiO丰度大1个数量级。 HCO丰度约为〜10〜(-11),与暗云中静态气体的离子分子反应模型所预测的相近。 SiO / HCO丰度比(> 150)从4.7 km s〜(-1)到5.2 km s〜(-1)发生了很大变化,并且SiO朝L1448-mm方向的发射分布和运动学表明,周围SiO与分子流出。我们提出,环境气体中较窄的线宽和SiO的丰度是通过冲击的磁性和/或辐射前体与块状预激环境气体的相互作用而产生的。

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