Probing the kinematics and chemistry of the hot core Mon R2 IRS 3 using ALMA observations

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Fuente, A.Observatorio Astronómico Nacional (OAN),Spanish National Observatory (OAN) (author)

Probing the kinematics and chemistry of the hot core Mon R2 IRS 3 using ALMA observations

Article/chapterEnglish2021

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2021-08-02
Oxford University Press (OUP),2021

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LIBRIS-ID:oai:research.chalmers.se:1dda36eb-62f9-4d37-8218-6df038ff3aaa
https://research.chalmers.se/publication/526581URI
https://doi.org/10.1093/mnras/stab2216DOI

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Language:English
Summary in:English

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Subject category:ref swepub-contenttype

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We present high angular resolution 1.1 mm continuum and spectroscopic Atacama Large Millimeter/submillimeter Array observations of the well-known massive protocluster Mon R2 IRS 3. The continuum image at 1.1 mm shows two components, IRS 3 A and IRS 3 B, that are separated by ∼0.65 arcsec. We estimate that IRS 3 A is responsible of ∼80 per cent 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 ∼0.5 arcsec 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 ν2 = 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$_k\, \sim$ 170 K towards the IRS 3 A. The most abundant S-bearing species is SO2 with an abundance of ∼1.3 × 10-7, and χ(SO/SO2) ∼0.29. Assuming the solar abundance, SO2 accounts for ∼1 per cent of the sulphur budget.

Subject headings and genre

NATURVETENSKAP Biologi Botanik hsv//swe
NATURAL SCIENCES Biological Sciences Botany hsv//eng
NATURVETENSKAP Fysik Astronomi, astrofysik och kosmologi hsv//swe
NATURAL SCIENCES Physical Sciences Astronomy, Astrophysics and Cosmology hsv//eng
NATURVETENSKAP Biologi Zoologi hsv//swe
NATURAL SCIENCES Biological Sciences Zoology hsv//eng
ISM: molecules; ISM: individual objects: Monoceros R2
stars: massive
stars: protostars
ISM: abundances
ISM: kinematics and dynamics

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Treviño Morales, Sandra,1985Chalmers tekniska högskola,Chalmers University of Technology(Swepub:cth)trevino (author)
Alonso-Albi, T.Observatorio Astronómico Nacional (OAN),Spanish National Observatory (OAN) (author)
Sanchez-Monge, A.Universität zu Köln,University of Cologne (author)
Riviere-Marichalar, P.Observatorio Astronómico Nacional (OAN),Spanish National Observatory (OAN) (author)
Navarro-Almaida, D.Observatorio Astronómico Nacional (OAN),Spanish National Observatory (OAN) (author)
Observatorio Astronómico Nacional (OAN)Chalmers tekniska högskola (creator_code:org_t)

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In:Monthly Notices of the Royal Astronomical Society: Oxford University Press (OUP)507:2, s. 1886-18980035-87111365-2966

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