ALMA Observations of the IRDC Clump G34.43+00.24 MM3: Complex Organic and Deuterated Molecules

Abstract

We have observed complex organic molecules (COMs) and deuterated species toward a hot core/corino (HC) associated with the infrared dark cloud (IRDC) clump G34.43+00.24 MM3 with the Atacama Large Millimeter/submillimeter Array (ALMA). We have detected six normal-COMs (CH3OH, CH3CHO, CH3CH2CN, CH3OCH3, HCOOCH3, and NH2CHO), one deuterated-COM (CH2DCN), and two deuterated fundamental molecules (D2CO and DNC) toward G34.43+00.24 MM3 HC. None of these lines, except for CH3OH, are detected toward the shocked regions in our data, which suggests that COMs do not originate in shocks. The abundance of the COMs relative to CH3OH in G34.43+00.24 MM3 HC is found to be similar to those in high-mass hot cores, rather than those in hot corinos in low-mass star-forming regions. This result suggests that the physical conditions of the warm-up phase of G34.43+00.24 MM3 HC are similar to those of high-mass sources. On the other hand, the D2CO abundance relative to CH${}_3$OH in G34.43+00.24 MM3 HC is higher than that of other hot cores, and seems to be comparable to that of hot corinos. The relatively high D2CO/CH3OH ratio of G34.43+00.24 MM3 HC implies a long cold starless phase of G34.43+00.24 MM3 HC.

arXiv commentaccepted to ApJ

References in corpus (44)

• A computer program for fast non-LTE analysis of interstellar line spectra
• Formation of methyl formate and other organic species in the warm-up phase of hot molecular cores
• Infrared Dark Clouds: precursors to star clusters
• A three-phase chemical model of hot cores: the formation of glycine
• The ALMA Protostellar Interferometric Line Survey (PILS): First results from an unbiased submillimeter wavelength line survey of the Class 0 protostellar binary IRAS 16293-2422 with ALMA
• Star formation through gravitational collapse and competitive accretion
• Outflow Feedback Regulated Massive Star Formation in Parsec-Scale Cluster Forming Clumps
• Testing grain-surface chemistry in massive hot-core regions
• Molecular Evolution and Star Formation: From Prestellar Cores to Protostellar Cores
• Chemistry in Infrared Dark Cloud Clumps: a Molecular Line Survey at 3 mm
• Fragmentation at the Earliest Phase of Massive Star Formation
• Constraining the abundances of complex organics in the inner regions of solar-type protostars
• Exploring Molecular Complexity with ALMA (EMoCA): Deuterated complex organic molecules in Sagittarius B2(N2)
• Fragmentation of Molecular Clumps and Formation of Protocluster
• CO Depletion and Deuterium Fractionation in Prestellar Cores
• Testing grain surface chemistry : a survey of deuterated formaldehyde and methanol in low-mass Class 0 protostars
• The H2CO abundance in the inner warm regions of low mass protostellar envelopes
• Infalling-Rotating Motion and Associated Chemical Change in the Envelope of IRAS 16293-2422 Source A Studied with ALMA
• From Prestellar to Protostellar Cores II. Time Dependence and Deuterium Fractionation
• A Massive Prestellar Clump Hosting no High-Mass Cores
• Massive Protostars in the Infrared Dark Cloud MSXDC G034.43+00.24
• The HNC/HCN Ratio in Star-Forming Regions
• The census of complex organic molecules in the solar type protostar IRAS16293-2422
• Formaldehyde and methanol deuteration in protostars: fossiles from a past fast high density pre-collapse phase
• Exploring molecular complexity with ALMA (EMoCA): Simulations of branched carbon-chain chemistry in Sgr B2(N)
• A Molecular Line Observation toward Massive Clumps Associated with Infrared Dark Clouds
• Dust and gas emission in the prototypical hot core G29.96-0.02 at sub-arcsecond resolution
• L1521E: the first starless core with no molecular depletion
• Dense core properties in the Infrared Dark cloud G14.225-0.506 revealed by ALMA
• The ALMA-PILS survey: Formaldehyde deuteration in warm gas on small scales toward IRAS 16293-2422 B
• Annual Parallax Measurements of an Infrared Dark Cloud MSXDC G034.43+00.24 with VERA
• Molecular outflows within the filamentary infrared dark cloud G34.43+0.24
• Kinematics and Chemistry of the Hot Molecular Core in G34.26+0.15 at High Resolution
• L1521E: A Starless Core in the Early Evolutionary Stage ?
• The Deuterium Fraction in Massive Starless Cores and Dynamical Implications
• Distances to Dark Clouds: Comparing Extinction Distances to Maser Parallax Distances
• Distributed Low-Mass Star Formation in the IRDC G34.43+00.24
• ALMA Observations of the IRDC Clump G34.43+00.24 MM3: Hot Core and Molecular Outflows
• Intermediate-mass hot cores at 500 AU: disks or outflows?
• Gas Kinematics and Star Formation in the Filamentary IRDC G34.43+0.24
• SMA Observations of W3(OH) Complex: Physical and Chemical Differentiation between W3(H${}_2$O) and W3(OH)
• SMA observations of the W3(OH) complex: Dynamical differentiation between W3(H${}_2$O) and W3(OH)
• ALMA Observations of the IRDC Clump G34.43+00.24 MM3: 278 GHz Class I Methanol Masers
• ALMA Observations of the IRDC Clump G34.43+00.24 MM3: DNC/HNC Ratio

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• The ALMA Survey of 70 $\mu$m Dark High-mass Clumps in Early Stages (ASHES). IX. Physical Properties and Spatial Distribution of Cores in IRDCs
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• ATOMS: ALMA Three-millimeter Observations of Massive Star-forming regions -- VIII. A search for hot cores by using C${}_2$H${}_5$CN, CH${}_3$OCHO and CH${}_3$OH lines
• Molecular Cloud Cores with High Deuterium Fraction: Nobeyama Single-Pointing Survey
• Influence of Wolf-Rayet stars on surrounding star-forming molecular clouds
• Sulphur-Bearing and Complex Organic Molecules in an Infrared Cold Core
• Multiple molecular outflows and fragmentation in the IRDC core G34.43+00.24 MM1
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