ATOMS: ALMA Three-millimeter Observations of Massive Star-forming regions -- X. Chemical differentiation among the massive cores in G9.62+0.19

Abstract

Investigating the physical and chemical structures of massive star-forming regions is critical for understanding the formation and the early evolution of massive stars. We performed a detailed line survey toward six dense cores named as MM1, MM4, MM6, MM7, MM8, and MM11 in G9.62+0.19 star-forming region resolved in ALMA band 3 observations. Toward these cores, about 172 transitions have been identified and attributed to 16 species including organic Oxygen-, Nitrogen-, Sulfur-bearing molecules and their isotopologues. Four dense cores MM7, MM8, MM4, and MM11 are line rich sources. Modeling of these spectral lines reveals the rotational temperature in a range of 72$-$115~K, 100$-$163~K, 102$-$204~K, and 84$-$123~K for the MM7, MM8, MM4, and MM11, respectively. The molecular column densities are 1.6 $\times$ 10${}^{15}$ $-$ 9.2 $\times$ 10${}^{17}$~cm${}^{-2}$ toward the four cores. The cores MM8 and MM4 show chemical difference between Oxygen- and Nitrogen-bearing species, i.e., MM4 is rich in oxygen-bearing molecules while nitrogen-bearing molecules especially vibrationally excited HC${}_3$N lines are mainly observed in MM8. The distinct initial temperature at accretion phase may lead to this N/O differentiation. Through analyzing column densities and spatial distributions of O-bearing Complex Organic Molecules (COMs), we found that C${}_2$H${}_5$OH and CH${}_3$OCH${}_3$ might have a common precursor, CH${}_3$OH. CH${}_3$OCHO and CH${}_3$OCH${}_3$ are likely chemically linked. In addition, the observed variation in HC${}_3$N and HC${}_5$N emission may indicate that their different formation mechanism at hot and cold regions.

40 pages, 23 figures

References in corpus (39)

• Complex Chemistry in Star-Forming Regions: An Expanded Gas-Grain Warm-up Chemical Model
• Formation of methyl formate and other organic species in the warm-up phase of hot molecular cores
• MAMBO Mapping of Spitzer c2d Small Clouds and Cores
• 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
• Testing grain-surface chemistry in massive hot-core regions
• Formation of complex organic molecules in cold objects: the role of gas phase reactions
• The origin of complex organic molecules in prestellar cores
• The Spatial Distribution of Complex Organic Molecules in the L1544 Pre-stellar Core
• The largest oxigen bearing organic molecule repository
• Constraining the abundances of complex organics in the inner regions of solar-type protostars
• Modeling Complex Organic Molecules in dense regions: Eley-Rideal and complex induced reaction
• Herschel observations of EXtra-Ordinary Sources: Analysis of the HIFI 1.2 THz Wide Spectral Survey Toward Orion KL I. Methods
• The formation of ethylene glycol and other complex organic molecules in star-forming regions
• Thiols in the ISM: first detection of HC(O)SH and confirmation of C${}_2$H${}_5$SH
• ATOMS: ALMA Three-millimeter Observations of Massive Star-forming regions -- I. Survey description and a first look at G9.62+0.19
• SOLIS II. Carbon-chain growth in the Solar-type protocluster OMC2-FIR4
• O-bearing complex organic molecules at the cyanopolyyne peak of TMC-1: detection of C2H3CHO, C2H3OH, HCOOCH3, and CH3OCH3
• Evolutionary study of complex organic molecules in high-mass star-forming regions
• A systematic TMRT observational study of Galactic ${}^{12}$C/${}^{13}$C ratios from Formaldehyde
• Methanol formation via oxygen insertion chemistry in ice
• ATOMS:ALMA Three-millimeter Observations of Massive Star-forming regions -- III :Catalogues of candidate hot molecular cores and Hyper/Ultra compact HII regions
• The family of amide molecules toward NGC 6334I
• Complex organic molecules in comets from remote-sensing observations at millimeter wavelengths
• The GUAPOS project II. A comprehensive study of peptide-like bond molecules
• History of the solar-type protostar IRAS16293-2422 as told by the cyanopolyynes
• Modeling and Analysis Generic Interface for eXternal numerical codes (MAGIX)
• A simple prescription for simulating and characterizing gravitational arcs
• On Simulating the Proton-Irradiation of O${}_2$ and H${}_2$O Ices Using Astrochemical-type Models, with Implications for Bulk Reactivity
• On the chemical ladder of esters. Detection and formation of ethyl formate in the W51 e2 hot molecular core
• Formation of complex organic molecules in molecular clouds: acetaldehyde, vinyl alcohol, ketene, and ethanol via the "energetic" processing of C${}_2$H${}_2$ ice
• ATOMS: ALMA Three-millimeter Observations of Massive Star-forming regions -- II. Compact objects in ACA observations and star formation scaling relations
• SMA Observations of W3(OH) Complex: Physical and Chemical Differentiation between W3(H${}_2$O) and W3(OH)
• Molecular analysis of a high-mass prestellar core candidate in W43-MM1
• Identification of Methyl Isocyanate and Other Complex Organic Molecules in a Hot Molecular Core, G31.41+0.31
• ALMA reveals the magnetic field evolution in the high-mass star forming complex G9.62+0.19
• Observations of Cyanopolyynes toward Four High-Mass Star-Forming Regions Containing Hot Cores
• New detections of HC${}_5$N toward hot cores associated with 6.7 GHz methanol masers
• ALMA Observations of the massive molecular outflow G331.512-0.103 II: physical properties, kinematics, and geometry modeling
• Carbon-chain molecule survey toward four low-mass molecular outflow sources