ALMA Observations of Molecular Complexity in the Large Magellanic Cloud: The N105 Star-Forming Region

Abstract

The Large Magellanic Cloud (LMC) is the nearest laboratory for detailed studies on the formation and survival of complex organic molecules (COMs), including biologically important ones, in low-metallicity environments--typical for earlier cosmological epochs. We report the results of 1.2 mm continuum and molecular line observations of three fields in the star-forming region N105 with the Atacama Large Millimeter/submillimeter Array (ALMA). N105 lies at the western edge of the LMC bar with on-going star formation traced by H${}_2$O, OH, and CH${}_3$OH masers, ultracompact H II regions, and young stellar objects. Based on the spectral line modeling, we estimated rotational temperatures, column densities, and fractional molecular abundances for twelve 1.2 mm continuum sources. We identified sources with a range of chemical make-ups, including two bona fide hot cores and four hot core candidates. The CH${}_3$OH emission is widespread and associated with all the continuum sources. COMs CH${}_3$CN and CH${}_3$OCH${}_3$ are detected toward two hot cores in N105 together with smaller molecules typically found in Galactic hot cores (e.g., SO${}_2$, SO, and HNCO) with the molecular abundances roughly scaling with metallicity. We report a tentative detection of the astrobiologically relevant formamide molecule (NH${}_2$CHO) toward one of the hot cores; if confirmed, this would be the first detection of NH${}_2$CHO in an extragalactic sub-solar metallicity environment. We suggest that metallicity inhomogeneities resulting from the tidal interactions between the LMC and the Small Magellanic Cloud (SMC) might have led to the observed large variations in COM abundances in LMC hot cores.

75 pages, 48 figures, 7 tables (including appendices); Accepted for publication in the Astrophysical Journal

References in corpus (113)

• The chemical composition of the Sun
• Cosmic Star Formation History
• Observations of the Icy Universe
• Physical Properties of Wolf-Rayet Stars
• Interpreting Spectral Energy Distributions from Young Stellar Objects. I. A grid of 200,000 YSO model SEDs
• Spitzer Survey of the Large Magellanic Cloud, Surveying the Agents of a Galaxy's Evolution (SAGE) I: Overview and Initial Results
• An eclipsing binary distance to the Large Magellanic Cloud accurate to 2 per cent
• New Interstellar Dust Models Consistent with Extinction, Emission, and Abundance Constraints
• Gas-to-Dust mass ratios in local galaxies over a 2 dex metallicity range
• MAMBO Mapping of Spitzer c2d Small Clouds and Cores
• Our astrochemical heritage
• Photochemistry and astrochemistry: photochemical pathways to interstellar complex organic molecules
• Massive Stars: Their Environment and Formation
• Testing grain-surface chemistry in massive hot-core regions
• The VMC Survey - I. Strategy and First Data
• Cosmic Histories of Stars, Gas, Heavy Elements, and Dust
• Tracing the Mass during Low-Mass Star Formation. I. Submillimeter Continuum Observations
• Astrochemistry During the Formation of Stars
• The Second Survey of the Molecular Clouds in the Large Magellanic Cloud by NANTEN I: Catalog of Molecular Clouds
• The Magellanic Mopra Assessment (MAGMA). I. The Molecular Cloud Population of the Large Magellanic Cloud
• The origin of complex organic molecules in prestellar cores
• Astrochemistry and compositions of planetary systems
• The Interstellar dust properties of nearby galaxies
• Non-Standard Grain Properties, Dark Gas Reservoir, and Extended Submillimeter Excess, Probed by Herschel in the Large Magellanic Cloud
• SiO line emission from C-type shock waves : interstellar jets and outflows
• A 2 mm spectral line survey of the starburst galaxy NGC 253
• The VISTA Science Archive
• Methanol masers : Reliable tracers of the early stages of high-mass star formation
• Complex Molecules in the L1157 Molecular Outflow
• Gas phase formation of the prebiotic molecule formamide: insights from new quantum computations
• Dust and Gas in the Magellanic Clouds from the HERITAGE Herschel Key Project. I. Dust Properties and Insights into the Origin of the Submm Excess Emission
• Linking dust emission to fundamental properties in galaxies: The low-metallicity picture
• Astrochemistry of dust, ice and gas: introduction and overview
• High and Intermediate-Mass Young Stellar Objects in the Large Magellanic Cloud
• UV photodesorption of methanol in pure and CO-rich ices: desorption rates of the intact molecule and of the photofragments
• Shedding light on the formation of the pre-biotic molecule formamide with ASAI
• Seeds Of Life In Space (SOLIS): The organic composition diversity at 300--1000 au scale in Solar-type star forming regions
• Chemical evolution in the early phases of massive star formation. I
• VLT/UVES Observations of Interstellar Molecules and Diffuse Bands in the Magellanic Clouds
• The ALMA-PILS survey: First detections of deuterated formamide and deuterated isocyanic acid in the interstellar medium
• Seeds of Life in Space (SOLIS) III. Formamide in protostellar shocks: evidence for gas-phase formation
• Observations of the Large Magellanic Cloud with Fermi
• eXtended CASA Line Analysis Software Suite (XCLASS)
• Dust and Gas in the Magellanic Clouds from the HERITAGE Herschel Key Project. II. Gas-to-Dust Ratio Variations across ISM Phases
• Formation and recondensation of complex organic molecules during protostellar luminosity outbursts
• Sensitivity analysis of grain surface chemistry to binding energies of ice species
• The census of interstellar complex organic molecules in the Class I hot corino of SVS13-A
• New quantum chemical computations of formamide deuteration support a gas-phase formation of this prebiotic molecule
• Molecules with a peptide link in protostellar shocks: a comprehensive study of L1157
• Chemical modelling of complex organic molecules with peptide-like bonds in star-forming regions
• The Software Package for Astronomical Reductions with KMOS: SPARK
• Formation of the Young Massive Cluster R136 triggered by Tidally-driven Colliding HI Flows
• X-Rays from Superbubbles in the Large Magellanic Cloud. VI. A Sample of Thirteen Superbubbles
• Interstellar formamide (NH${}_2$CHO), a key prebiotic precursor
• Detection of the Small Magellanic Cloud in gamma-rays with Fermi/LAT
• Abundances and Isotope Ratios in the Magellanic Clouds: The Star Forming Environment of N113
• Bipolar Molecular Outflows and Hot Cores in GLIMPSE Extended Green Objects (EGOs)
• The Evolution of Massive YSOs in the LMC: Part I. Identification and Spectral Classification
• O-bearing complex organic molecules at the cyanopolyyne peak of TMC-1: detection of C2H3CHO, C2H3OH, HCOOCH3, and CH3OCH3
• Inferring physical conditions in interstellar clouds of H_2
• An ALMA view of molecular filaments in the Large Magellanic Cloud II: An early stage of high-mass star formation embedded at colliding clouds in N159W-South
• Reactive Desorption of CO Hydrogenation Products under Cold Pre-stellar Core Conditions
• The SAGE-Spec Spitzer Legacy program: The life-cycle of dust and gas in the Large Magellanic Cloud. Point source classification III
• Efficiency of non-thermal desorptions in cold-core conditions. Testing the sputtering of grain mantles induced by cosmic rays
• Early-stage young stellar objects in the Small Magellanic Cloud
• Hydrogenation at low temperatures does not always lead to saturation: the case of HNCO
• Kinematics and Chemistry of the Hot Molecular Core in G34.26+0.15 at High Resolution
• An ALMA view of molecular filaments in the Large Magellanic Cloud I: The formation of high-mass stars and pillars in the N159E-Papillon Nebula triggered by a cloud-cloud collision
• The Detection of Hot Cores and Complex Organic Molecules in the Large Magellanic Cloud
• Dynamical Influences of the Last Magellanic Interaction On the Magellanic Clouds
• Chemical complexity induced by efficient ice evaporation in the Barnard 5 molecular cloud
• A Spitzer Space Telescope far-infrared spectral atlas of compact sources in the Magellanic Clouds. II. The Small Magellanic Cloud
• Multibeam Maser Survey of methanol and excited OH in the Magellanic Clouds: new detections and maser abundance estimates
• Chemical distribution of HII regions towards the Galactic anticentre
• ALMA observations of the young protostellar system Barnard 1b: signatures of an incipient hot corino in B1b-S
• AKARI Near Infrared Spectroscopy: Detection of H2O and CO2 Ices toward Young Stellar Objects in the Large Magellanic Cloud
• The Life and Death of Dense Molecular Clumps in the Large Magellanic Cloud
• The Magellanic Squall: Gas Replenishment from the Small to Large Magellanic Cloud
• Detection of a hot molecular core in the Large Magellanic Cloud with ALMA
• Masers associated with high-mass star formation regions in the Large Magellanic Cloud
• Formation of the active star forming region LHA 120-N 44 triggered by tidally-driven colliding HI flows
• Massive Young Stellar Objects in the Large Magellanic Cloud: water masers and ESO-VLT 3-4 micron spectroscopy
• Study of the photon-induced formation and subsequent desorption of CH3 OH and H2 CO in interstellar ice analogs
• Evidence for chemical evolution in the spectra of high redshift galaxies
• The detection of a hot molecular core in the extreme outer Galaxy
• Chemical Segregation in Hot Cores With Disk Candidates: An investigation with ALMA
• Deep K-band observations of TMC-1 with the Green Bank Telescope: Detection of HC7O, non-detection of HC11N, and a search for new organic molecules
• Ice chemistry in massive Young Stellar Objects: the role of metallicity
• Ice chemistry in embedded young stellar objects in the Large Magellanic Cloud
• Spectral Line Survey toward Molecular Clouds in the Large Magellanic Cloud
• A population of hypercompact HII regions identified from young HII regions
• A search for hypercompact HII regions in the Galactic Plane
• The youngest massive protostars in the Large Magellanic Cloud
• Intermediate-mass hot cores at 500 AU: disks or outflows?
• $K$-band integral field spectroscopy and optical spectroscopy of massive young stellar objects in the Small Magellanic Cloud
• Evaporation of grain-surface species by shock waves in proto-planetary disk
• Evolution of dust and molecular hydrogen in the Magellanic System
• The ASKAP-EMU Early Science Project: 888 MHz Radio Continuum Survey of the Large Magellanic Cloud
• Observations of ground-state OH in the Large Magellanic Cloud
• VLT/ISAAC infrared spectroscopy of embedded high-mass YSOs in the Large Magellanic Cloud: Methanol and the 3.47 micron band
• Chemistry and physics of a low-metallicity hot core in the Large Magellanic Cloud
• Efficient methanol production on the dark side of a prestellar core
• Integral Field Spectroscopy of Massive Young Stellar Objects in the N113 H\,{\sc ii} Region in the Large Magellanic Cloud
• Complex Organic Molecules in Star-Forming Regions of the Magellanic Clouds
• Modeling CO, CO${}_2$ and H${}_2$O ice abundances in the envelopes of young stellar objects in the Magellanic Clouds
• Herschel spectroscopy of Massive Young Stellar Objects in the Magellanic Clouds
• Cold Water Vapor in the Barnard 5 Molecular Cloud
• ATCA survey of water masers in the Large Magellanic Cloud
• The TOPGöt high-mass star-forming sample. I. Methyl cyanide emission as tracer of early phases of star formation
• Observations of chemical differentiation in clumpy molecular clouds
• Detection of deuterated molecules, but not of lithium hydride, in the z=0.89 absorber toward PKS1830-211
• VLT/X-shooter spectroscopy of massive young stellar objects in the 30 Doradus region of the Large Magellanic Cloud
• An ALMA archival study of the clump mass function in the Large Magellanic Cloud

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• An ALMA Glimpse of Dense Molecular Filaments Associated with High-mass Protostellar Systems in the Large Magellanic Cloud
• CHEMOUT: CHEMical complexity in star-forming regions of the OUTer Galaxy. II. Methanol formation at low metallicity
• Near-infrared spectroscopy of embedded protostars in the massive metal-poor star-forming region NGC 346
• The Detection of Deuterated Water in the Large Magellanic Cloud with ALMA
• An ALCHEMI inspection of sulphur-bearing species towards the central molecular zone of NGC 253
• Protostars at Subsolar Metallicity: First Detection of Large Solid-state Complex Organic Molecules in the Large Magellanic Cloud
• CHEMOUT: CHEMical complexity in star-forming regions of the OUTer Galaxy. V. Chemical composition gradients as a function of the galactocentric radius
• MAGellanic Outflow and chemistry Survey (MAGOS): Hot cores in the LMC
• First detection of CF${}^{+}$ in the Large Magellanic Cloud
• Chemistry of Dark Molecular Clouds
• Molecular Formation in Low-Metallicity Hot Cores