On the kinematics of massive star forming regions: the case of IRAS 17233-3606
On the kinematics of massive star forming regions: the case of IRAS 17233-3606
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大质量恒星形成区域的运动学：以 IRAS 17233-3606 为例
DOI：
10.1051/0004-6361/201016190
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发表时间：
2011
影响因子：
6.5
通讯作者：
U. Koeln
中科院分区：
文献类型：
--
作者：
S. Leurini;C. Codella;L. Zapata;M. Beltrán;P. Schilke;R. C. M. F. Radioastronomie;;O. Arcetri;C. D. Astrofisica;U. Mexico;P. Institut;U. Koeln
语境。 Direct observations of accretion disks around high-mass young stellar objects would help to discriminate between different models of formation of massive stars.然而，考虑到大质量恒星形成区域的复杂性，此类研究的数量仍然有限。此外，对于用于此类研究的分子示踪剂尚未达成普遍共识。目标。 Because of its close distance and high luminosity, IRAS 17233−3606 is a potential good laboratory to search for traces of rotation in the inner gas around the protostar(s).因此，我们选择 d 源，使用 SMA 在 230 GHz 下对其分子发射进行详细分析。方法。 We systematically investigated the velocity fields of transitions in the SMA spectra which are not affected by overlap with other transitions, and searched for coherent velocity gradients to comp are them to the distribution of outflows in the region.除了 CO 排放之外，我们还使用高角度 H2 图像来追踪 IRAS 17233−3606 星团驱动的流出运动。结果。我们在同一分子种类和多个分子的许多跃迁中发现了线速度梯度。我们报告了首次在大量 YSO 的分子流出物中检测到 HNCO。 We disc uss the CH3CN velocity gradient taking into account various scenarios: rotation, expansion, presence of multiple unresolv ed sources with different velocities, and outflow(s).尽管不能排除其他解释，但我们认为 CH3CN 排放可能受到该地区外流的影响。需要更高的角度观察来区分不同的场景。结论。 The present observations, with the possible association of CH3CN with outflows in a few thousands AU around the YSOs’ cluster, (i) question the choice of the tracer to probe rotating structu res, and (ii) show the importance of the use of H2 images for detailed studies of kinematics.
Context. Direct observations of accretion disks around high-mass young stellar objects would help to discriminate between different models of formation of massive stars. However, given the complexity of massive star forming regions, such studies are still limited in number. Additionally, there is still no general consensus on the molecular tracers to be used for such investigations. Aims. Because of its close distance and high luminosity, IRAS 17233−3606 is a potential good laboratory to search for traces of rotation in the inner gas around the protostar(s). Therefore, we selecte d the source for a detailed analysis of its molecular emission at 230 GHz with the SMA. Methods. We systematically investigated the velocity fields of transitions in the SMA spectra which are not affected by overlap with other transitions, and searched for coherent velocity gradients to comp are them to the distribution of outflows in the region. Beside CO emission we also used high-angular H2 images to trace the outflow motions driven by the IRAS 17233−3606 cluster. Results. We find linear velocity gradients in many transitions of the same molecular spe cies and in several molecules. We report the first detection of HNCO in molecular outflows from massive YSOs. We disc uss the CH3CN velocity gradient taking into account various scenarios: rotation, expansion, presence of multiple unresolv ed sources with different velocities, and outflow(s). Although other interpretations cannot be ruled out, we propose that the CH3CN emission might be affected by the outflows of the region. Higher angular observations are needed to discriminate between the different scenarios. Conclusions. The present observations, with the possible association of CH3CN with outflows in a few thousands AU around the YSOs’ cluster, (i) question the choice of the tracer to probe rotating structu res, and (ii) show the importance of the use of H2 images for detailed studies of kinematics.
影响因子：
6.5
作者：
Bottinelli, S.;Ceccarelli, C.;Lefloch, B.
通讯作者：
Lefloch, B.