The physical and chemical structure of Sagittarius B2, VIII. Full molecular line survey of hot cores

Abstract

The giant molecular cloud complex Sagittarius B2 (Sgr~B2) in the central molecular zone of our Galaxy hosts several high-mass star formation sites, with Sgr~B2(M) and Sgr~B2(N) being the main centers of activity. This analysis aims to comprehensively model each core spectrum, considering molecular lines, dust attenuation, and free-free emission interactions. We describe the molecular content analysis of each hot core and identify the chemical composition of detected sources. Using ALMA's high sensitivity, we aim to characterize the hot core population in Sgr~B2(M) and N, gaining a better understanding of the different evolutionary phases of star formation processes in this complex. We conducted an unbiased ALMA spectral line survey of 47 sources in band 6 (211-275 GHz). Chemical composition and column densities were derived using XCLASS, assuming local thermodynamic equilibrium. Quantitative descriptions for each molecule were determined, considering all emission and absorption features across the spectral range. Temperature and velocity distributions were analyzed, and derived abundances were compared with other spectral line surveys. We identified 65 isotopologs from 41 different molecules, ranging from light molecules to complex organic compounds, originating from various environments. Most sources in the Sgr~B2 complex were assigned different evolutionary phases of high-mass star formation. Sgr~B2(N) hot cores show more complex molecules such as CH${}_3$OH, CH${}_3$OCHO, and CH${}_3$OCH${}_3$, while M cores contain lighter molecules such as SO${}_2$, SO, and NO. Some sulfur-bearing molecules are more abundant in N than in M. The derived molecular abundances can be used for comparison and to constrain astrochemical models. Inner sources in both regions were generally more developed than outer sources, with some exceptions.

References in corpus (93)

• SciPy 1.0--Fundamental Algorithms for Scientific Computing in Python
• emcee: The MCMC Hammer
• A geometric distance measurement to the Galactic Center black hole with 0.3% uncertainty
• Formation of methyl formate and other organic species in the warm-up phase of hot molecular cores
• The Cologne Database for Molecular Spectroscopy, CDMS, in the Virtual Atomic and Molecular Data Centre, VAMDC
• Complex organic molecules in the interstellar medium: IRAM 30 m line survey of Sagittarius B2(N) and (M)
• An Ice Age JWST inventory of dense molecular cloud ices
• Testing grain-surface chemistry in massive hot-core regions
• Formation of complex organic molecules in cold objects: the role of gas phase reactions
• Increased complexity in interstellar chemistry: Detection and chemical modeling of ethyl formate and n-propyl cyanide in Sgr B2(N)
• Detection of a branched alkyl molecule in the interstellar medium: iso-propyl cyanide
• SiO line emission from C-type shock waves : interstellar jets and outflows
• Spatially Resolved Chemistry in Nearby Galaxies I. The Center of IC 342
• Exploring Molecular Complexity with ALMA (EMoCA): Deuterated complex organic molecules in Sagittarius B2(N2)
• Gas phase formation of the prebiotic molecule formamide: insights from new quantum computations
• Resetting chemical clocks of hot cores based on S-bearing molecules
• Formation of complex organic molecules in hot molecular cores through nondiffusive grain-surface and ice-mantle chemistry
• Water in star-forming regions (WISH): Physics and chemistry from clouds to disks as probed by Herschel spectroscopy
• Re-exploring Molecular Complexity with ALMA (ReMoCA): Interstellar detection of urea
• The Circumstellar Environment of High Mass Protostellar Objects. III Evidence of Infall?
• Shedding light on the formation of the pre-biotic molecule formamide with ASAI
• The physical and chemical structure of Sagittarius B2, I. Three-dimensional thermal dust and free-free continuum modeling on 100 au to 45 pc scales
• Complex organic molecules in the Galactic Centre: the N-bearing family
• Comparative Chemistry of Diffuse Clouds II: CN, HCN, HNC, CH3CN & N2H+
• eXtended CASA Line Analysis Software Suite (XCLASS)
• An Overview of the 2014 ALMA Long Baseline Campaign
• Formation and recondensation of complex organic molecules during protostellar luminosity outbursts
• CN and HCN in Dense Interstellar Clouds
• ALMA and ROSINA detections of phosphorus-bearing molecules: the interstellar thread between star-forming regions and comets
• Class I and Class II methanol masers in high-mass star forming regions
• Herschel observations of EXtraordinary Sources: Analysis of the full Herschel/HIFI molecular line survey of Sagittarius B2(N)
• Chemistry in Infrared Dark Clouds
• Ethynyl (C2H) in massive star formation: Tracing the initial conditions?
• The complex chemistry of hot cores in Sagittarius B2(N): Influence of cosmic-ray ionization and thermal history
• Molecular ions in the protostellar shock L1157-B1
• Sulphur-bearing species in the star forming region L1689N
• Efficient Production of S${}_8$ in Interstellar Ices: The effects of cosmic ray-driven radiation chemistry and non-diffusive bulk reactions
• Exploring molecular complexity with ALMA (EMoCA): Detection of three new hot cores in Sagittarius B2(N)
• Exploring molecular complexity with ALMA (EMoCA): Simulations of branched carbon-chain chemistry in Sgr B2(N)
• The physical and chemical structure of Sagittarius B2. II. Continuum millimeter emission of SgrB2(M) and SgrB2(N) with ALMA
• A Unified Monte Carlo Treatment of Gas-Grain Chemistry for Large Reaction Networks. I. Testing Validity of Rate Equations in Molecular Clouds
• On the Relationship of UC H II Regions and Class II Methanol Masers: I. Source Catalogs
• The (impossible?) formation of acetaldehyde on the grain surfaces: insights from quantum chemical calculations
• STATCONT: A statistical continuum level determination method for line-rich sources
• Hydrogenation at low temperatures does not always lead to saturation: the case of HNCO
• A new look at sulphur chemistry in hot cores and corinos
• S-bearing molecules in Massive Dense Cores
• First detection of cyanamide (NH${}_2$CN) towards solar-type protostars
• Sulfur chemistry: 1D modeling in massive dense cores
• Submillimeter continuum observations of Sagittarius B2 at subarcsecond spatial resolution
• The ALMA-PILS survey: Stringent limits on small amines and nitrogen-oxides towards IRAS 16293-2422B
• Vibrationally excited HC3N in NGC 4418
• Dissecting the molecular structure of the Orion B cloud: Insight from Principal Component Analysis
• The Physical and chemical structure of Sagittarius B2 -- IV. Converging filaments in the high-mass cluster forming region Sgr B2(N)
• A Census of Early Phase High-Mass Star Formation in the Central Molecular Zone
• Modeling and Analysis Generic Interface for eXternal numerical codes (MAGIX)
• A simple prescription for simulating and characterizing gravitational arcs
• A Spectral Line Survey of Selected 3 mm Bands Toward Sagittarius B2(N-LMH) Using the NRAO 12 Meter Radio Telescope and the BIMA Array I. The Observational Data
• An Extensive, Sensitive Search for SiO Masers in High- and Intermediate-Mass Star-Forming Regions
• The first steps of Interstellar Phosphorus Chemistry
• On the origin of phosphorus nitride in star-forming regions
• Shocks in dense clouds. IV. Effects of grain-grain processing on molecular line emission
• Chemical modeling for predicting the abundances of certain aldimines and amines in hot cores
• The physical and chemical structure of Sagittarius B2 -- V. Non-thermal emission in the envelope of Sgr B2
• 13C Isotopic Fractionation of HC3N in Star-Forming Regions -Low-Mass Star Forming Region L1527 and High-Mass Star Forming Region G28.28-0.36-
• An ATCA Survey of Sagittarius~B2 at 7~mm: Chemical Complexity Meets Broadband Interferometry
• Water Masers in W49 North and Sagittarius B2
• ALMA view of G0.253+0.016: Can cloud-cloud collision form the cloud?
• Revisiting the reactivity between HCO and CH${}_3$ on interstellar grain surfaces
• Evidence of Short Timescale Flux Density Variations of UC HII regions in Sgr B2 Main and North
• The First Very Long Baseline Interferometry Image of 44 GHz Methanol Maser with the KVN and VERA Array (KaVA)
• Sulphur and carbon isotopes towards Galactic centre clouds
• Widespread Rotationally-Hot Hydronium Ion in the Galactic Interstellar Medium
• The Formaldehyde Masers in Sgr B2: Very Long Baseline Array and Very Large Array Observations
• The physical and chemical structure of Sagittarius B2 -- VI. UCHII regions in Sgr B2
• Reliability of NH3 as the temperature probe of cold cloud cores
• Isocyanic acid (HNCO) in the Hot Molecular Core G331.512-0.103: Observations and Chemical Modelling
• Search for methylamine in high mass hot cores
• SiS formation in the interstellar medium through Si+SH gas phase reactions
• Infrared Detection of Abundant CS in the Hot Core AFGL 2591 at High Spectral Resolution with SOFIA/EXES
• Chemical composition in the IRAS 16562--3959 high-mass star-forming region
• Herschel observations of extraordinary sources: Full Herschel/HIFI molecular line survey of Sagittarius B2(M)
• Interferometric Observations of Cyanopolyynes toward the G28.28-0.36 High-Mass Star-Forming Region
• The physical and chemical structure of Sagittarius B2. III. Radiative transfer simulations of the hot core SgrB2(M) for methyl cyanide
• Chemical modeling of the complex organic molecules in the extended region around Sagittarius B2
• Discovery of 14NH3 (2,2) maser emission in Sgr B2-Main
• ATLASGAL: 3-mm class I methanol masers in high-mass star formation regions
• An OH(1720 MHz) Maser and a Nonthermal Radio Source in Sgr B2(M): A SNR--Molecular Cloud Interaction Site?
• The physical and chemical structure of Sagittarius B2 VIIIa. Dust and ionized gas contributions to the full molecular line survey of 47 hot cores
• Discovery of ammonia (9,6) masers in two high-mass star-forming regions
• HyGAL: Characterizing the Galactic ISM with observations of hydrides and other small molecules II. The absorption line survey with the IRAM 30 m telescope
• Discovery of non-metastable ammonia masers in Sagittarius B2
• Problems of Star Formation Theory and Prospects of Submillimeter Observations

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