Universität zu Köln

Fuente, A., Trevino-Morales, S. P., Alonso-Albi, T., Sanchez-Monge, A., Riviere-Marichalar, P. and Navarro-Almaida, D. (2021). Probing the kinematics and chemistry of the hot core Mon R2 IRS 3 using ALMA observations. Mon. Not. Roy. Astron. Soc., 507 (2). S. 1886 - 1899. OXFORD: OXFORD UNIV PRESS. ISSN 1365-2966

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Abstract

We present high angular resolution 1.1mm continuum and spectroscopic Atacama Large Millimeter/submillimeter Array observations of the well-known massive protocluster Mon R2 IRS 3. The continuum image at 1.1mm shows two components, IRS 3 A and IRS 3 B, that are separated by similar to 0.65 arcsec. We estimate that IRS 3 A is responsible of similar to 80 percent 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, SO2, H2CS, and OCS, and of the complex organic molecules (COMs) methyl formate (CH3OCHO) and dimethyl ether (CH3OCH3). The integrated intensity maps of most species show a compact clump centred 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 HC3N whose emission peak is located similar to 0.5arcsec NE from IRS 3 A. The kinematical study suggests that the molecular emission is mainly coming from a rotating ring and/or an unresolved disc. Additional components are traced by the ro-vibrational HCN nu(2) = 1 3 -> 2 line which is probing the inner disc/jet region, and the weak lines of CH3OCHO, more likely arising from the walls of the cavity excavated by the molecular outflow. Based on SO2 we derive a gas kinetic temperature of T 170 K towards the IRS 3 A. The most abundant S-bearing species is SO2 with an abundance of similar to 1.3 x 10(-7), and chi(SO/SO2) similar to 0.29. Assuming the solar abundance, SO2 accounts for similar to 1 percent of the sulphur budget.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Fuente, A. UNSPECIFIED UNSPECIFIED UNSPECIFIED Trevino-Morales, S. P. UNSPECIFIED UNSPECIFIED UNSPECIFIED Alonso-Albi, T. UNSPECIFIED UNSPECIFIED UNSPECIFIED Sanchez-Monge, A. UNSPECIFIED UNSPECIFIED UNSPECIFIED Riviere-Marichalar, P. UNSPECIFIED UNSPECIFIED UNSPECIFIED Navarro-Almaida, D. UNSPECIFIED UNSPECIFIED UNSPECIFIED
URN:	urn:nbn:de:hbz:38-577486
DOI:	10.1093/mnras/stab2216
Journal or Publication Title:	Mon. Not. Roy. Astron. Soc.
Volume:	507
Number:	2
Page Range:	S. 1886 - 1899
Date:	2021
Publisher:	OXFORD UNIV PRESS
Place of Publication:	OXFORD
ISSN:	1365-2966
Language:	English
Faculty:	Unspecified
Divisions:	Unspecified
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language COMPLEX ORGANIC-MOLECULES; FAR-INFRARED OBSERVATIONS; YOUNG STELLAR OBJECTS; MASS STAR-FORMATION; SULFUR CHEMISTRY; HIGH-RESOLUTION; FORMING REGION; DARK CLOUDS; LINE SURVEY; GAS Multiple languages Astronomy & Astrophysics Multiple languages
URI:	http://kups.ub.uni-koeln.de/id/eprint/57748