ALMA Observations of Molecular Complexity in the Large Magellanic Cloud: The N83 Star-Forming Region
Abstract
We report the results of the 1.2 mm continuum and molecular line ∼0.1 parsec-scale observations with the Atacama Large Millimeter/submillimeter Array of two fields in the star-forming region N83 in the Large Magellanic Cloud (LMC). This study is third in a series of investigations exploring molecular complexity in a low-metallicity and high UV flux environment of the LMC. We determine the physical and chemical properties of five sources detected with ALMA based on spectral modeling with XCLASS and the analysis of the continuum emission. The temperatures exceeding 100 K, small sizes, and high H2 volume densities of sources N83A-mm A and B indicate that they are hot cores. N83A-mm A/B are associated with complex organic molecules: methanol (CH3OH), methyl cyanide (CH3CN), and dimethyl ether (CH3OCH3). We also found CH3OH in three cold cores, and extended cold CH3OH emission in both fields. We detected SO, 33SO, SO2, OCS, H2CS, CS, C33S, HC15N, H13CN, HNCO, HDCO, H13CO+, SiO, and CH2CO in at least one core. Molecular abundances with respect to H2 fit into the trends previously reported for the Magellanic hot cores: the CH3OH abundance varies significantly, while the abundances of S-bearing species show small variations. We found evidence for strong UV radiation and complex kinematics in both ALMA fields in N83. The feedback-produced shocks are important drivers of the chemistry of S-bearing species, SiO, and CH3OH in and outside hot cores. Local effects have a large impact on the chemical composition and abundances of star-forming cores in the LMC.
Related
- ALMA Observations of DEM L241/LMC P3 in the Large Magellanic Cloud: Evidence for the Formation of Cool Molecular Jets Driven by a Microquasar
- ALMA Observations of DEM L241/LMC P3 in the Large Magellanic Cloud: Evidence for the Formation of Cool Molecular Jets Driven by a Microquasar
- B-fields In STar-forming Region Observations (BISTRO): Dual-Wavelength Constraints on Size-Dependent Grain Alignment in Star-Forming Regions
- B-fields In STar-forming Region Observations (BISTRO): Technical Foundations for Quantitative 450/850 μm JCMT SCUBA-2/POL-2 Polarimetry
- Detection of Aliphatically Deuterated Aromatic Hydrocarbons in the Large Magellanic Cloud 30 Doradus Star-forming Complex
BibTeX
@misc{sewilo2026alma,
title = {{ALMA Observations of Molecular Complexity in the Large Magellanic Cloud: The N83 Star-Forming Region}},
author = {Marta Sewiło and Amanda Broadmeadow and Roya Hamedani Golshan and Steven B. Charnley and Lee Mundy and Kazuki Tokuda and Thomas Möller and Jennifer Wiseman and C. -H. Rosie Chen and Remy Indebetouw and Joana M. Oliveira and Peter Schilke},
howpublished = {arXiv},
year = {2026},
month = oct,
doi = {10.48550/arxiv.2610.05447},
eprint = {2610.05447},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2610.05447},
note = {CC BY 4.0},
}
RIS
TY - UNPB
TI - ALMA Observations of Molecular Complexity in the Large Magellanic Cloud: The N83 Star-Forming Region
AU - Marta Sewiło
AU - Amanda Broadmeadow
AU - Roya Hamedani Golshan
AU - Steven B. Charnley
AU - Lee Mundy
AU - Kazuki Tokuda
AU - Thomas Möller
AU - Jennifer Wiseman
AU - C. -H. Rosie Chen
AU - Remy Indebetouw
AU - Joana M. Oliveira
AU - Peter Schilke
PY - 2026
DA - 2026/10/04
PB - arXiv
DO - 10.48550/arxiv.2610.05447
UR - https://arxiv.org/abs/2610.05447
AB - We report the results of the 1.2 mm continuum and molecular line ∼0.1 parsec-scale observations with the Atacama Large Millimeter/submillimeter Array of two fields in the star-forming region N83 in the Large Magellanic Cloud (LMC). This study is third in a series of investigations exploring molecular complexity in a low-metallicity and high UV flux environment of the LMC. We determine the physical and chemical properties of five sources detected with ALMA based on spectral modeling with XCLASS and the analysis of the continuum emission. The temperatures exceeding 100 K, small sizes, and high H_2 volume densities of sources N83A-mm A and B indicate that they are hot cores. N83A-mm A/B are associated with complex organic molecules: methanol (CH_3OH), methyl cyanide (CH_3CN), and dimethyl ether (CH_3OCH_3). We also found CH_3OH in three cold cores, and extended cold CH_3OH emission in both fields. We detected SO, ^33SO, SO_2, OCS, H_2CS, CS, C^33S, HC^15N, H^13CN, HNCO, HDCO, H^13CO^+, SiO, and CH_2CO in at least one core. Molecular abundances with respect to H_2 fit into the trends previously reported for the Magellanic hot cores: the CH_3OH abundance varies significantly, while the abundances of S-bearing species show small variations. We found evidence for strong UV radiation and complex kinematics in both ALMA fields in N83. The feedback-produced shocks are important drivers of the chemistry of S-bearing species, SiO, and CH_3OH in and outside hot cores. Local effects have a large impact on the chemical composition and abundances of star-forming cores in the LMC.
ER -