Report
Probing the kinematics and chemistry of the hot core Mon R 2 IRS 3 using ALMA observations
| العنوان: | Probing the kinematics and chemistry of the hot core Mon R 2 IRS 3 using ALMA observations |
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| المؤلفون: | Fuente, A., Treviño-Morales, S. P., Alonso-Albi, T., Sánchez-Monge, A., Rivière-Marichalar, P., Navarro-Almaida, D. |
| سنة النشر: | 2021 |
| المجموعة: | Astrophysics |
| مصطلحات موضوعية: | Astrophysics - Astrophysics of Galaxies, Astrophysics - Solar and Stellar Astrophysics |
| الوصف: | We present high angular resolution 1.1mm continuum and spectroscopic ALMA observations of the well-known massive proto-cluster Mon R 2 IRS 3.The continuum image at 1.1mm shows two components, IRS 3 A and IRS 3 B, that are separated by $\sim$0.65$"$. We estimate that IRS 3 A is responsible of $\sim$80 % of the continuum flux, being the most massive component. We explore the chemistry of IRS 3 A based on the spectroscopic observations. In particular, we have detected intense lines of S-bearing species such as SO, SO$_2$, H$_2$CS and OCS, and of the Complex Organic Molecules (COMs) methyl formate (CH$_3$OCHO) and dimethyl ether (CH$_3$OCH$_3$). The integrated intensity maps of most species show a compact clump centered on IRS 3 A, except the emission of the COMs that is more intense towards the near-IR nebula located to the south of IRS 3 A, and HC$_3$N whose emission peak is located $\sim$0.5$"$ NE from IRS 3 A. The kinematical study suggests that the molecular emission is mainly coming from a rotating ring and/or an unresolved disk. Additional components are traced by the ro-vibrational HCN $\nu_2$=1 3$\rightarrow$2 line which is probing the inner disk/jet region, and the weak lines of CH$_3$OCHO, more likely arising from the walls of the cavity excavated by the molecular outflow. Based on SO$_2$ we derive a gas kinetic temperature of T$_k$$\sim$ 170 K towards the IRS 3 A. The most abundant S-bearing species is SO$_2$ with an abundance of $\sim$ 1.3$\times$10$^{-7}$, and $\chi$(SO/SO$_2$) $\sim$ 0.29. Assuming the solar abundance, SO$_2$ accounts for $\sim$1 % of the sulphur budget. Comment: 12 pages, 8 figures, accepted for publication in MNRAS |
| نوع الوثيقة: | Working Paper |
| DOI: | 10.1093/mnras/stab2216 |
| URL الوصول: | http://arxiv.org/abs/2107.14532 |
| رقم الانضمام: | edsarx.2107.14532 |
| قاعدة البيانات: | arXiv |
| DOI: | 10.1093/mnras/stab2216 |
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