Complex Organic Molecules towards the central molecular zone of NGC 253

Abstract

Interstellar complex organic molecules (iCOMs) may have a link to prebiotic species, key building blocks for life. In Galactic star-forming (SF) regions, spatial variations of iCOMs emission could reflect the source physical structure or different chemical formation pathways. Investigating iCOMs in extragalactic SF regions may thus provide crucial information about these regions. As an active extragalactic SF region, the central molecular zone (CMZ) of the nearby galaxy NGC 253 provides an ideal template for studying iCOMs under more extreme conditions. We aim to investigate the emission of a few selected iCOMs and understand if a difference between the iCOMs could reflect on the source's chemical or physical structure. Using the high angular resolution ($\sim 27$ pc) observations from the ALCHEMI ALMA large program, we imaged the emission of selected iCOMs and precursors; CH${}_3$CHO, C${}_2$H${}_5$OH, NH${}_2$CHO, CH${}_2$NH, and CH${}_3$NH${}_2$. We estimated the iCOMs gas temperatures and column densities using a rotational diagram analysis, and by performing a non-LTE analysis for CH${}_2$NH.The iCOM emission concentrates mostly towards the inner part of the CMZ of NGC 253 and can be reproduced with two gas components. Different emission processes can explain iCOM emission towards the CMZ of NGC 253: at Giant Molecular Cloud (GMC) scales ($\sim 27$ pc), the iCOMs could trace large-scale shocks whilst at smaller scales (few pc), both shock and heating processes linked with ongoing star formation may be involved. Using column density correlation trends and known formation pathways, we find that more than one formation path could be involved to explain the iCOM emission. Finally, we found chemical differences between the GMCs, such as a decrease of abundance for the N-bearing species towards one of the GMCs or different excitation conditions for NH${}_2$CHO and CH${}_3$CHO towards two of the GMCs.

48 pages, 38 figures, accepted in A&A

References in corpus (117)

• Complex Chemistry in Star-Forming Regions: An Expanded Gas-Grain Warm-up Chemical Model
• 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)
• Evaporation of ices near massive stars: models based on laboratory TPD data
• Reactive Desorption and Radiative Association as Possible Drivers of Complex Molecule Formation in the Cold Interstellar Medium
• Astrochemistry During the Formation of Stars
• A 2 mm spectral line survey of the starburst galaxy NGC 253
• ALMA Reveals the Molecular Medium Fueling the Nearest Nuclear Starburst
• The ALMA-PILS survey: Isotopic composition of oxygen-containing complex organic molecules toward IRAS 16293-2422B
• Elemental and molecular abundances in comet 67P/Churyumov-Gerasimenko
• Complex Molecules in the L1157 Molecular Outflow
• Gas phase formation of the prebiotic molecule formamide: insights from new quantum computations
• Modeling Complex Organic Molecules in dense regions: Eley-Rideal and complex induced reaction
• Formation of complex organic molecules in hot molecular cores through nondiffusive grain-surface and ice-mantle chemistry
• Weeds: a CLASS extension for the analysis of millimeter and sub-millimeter spectral surveys
• Re-exploring Molecular Complexity with ALMA (ReMoCA): Interstellar detection of urea
• Molecules at z=0.89: A 4-mm-rest-frame absorption line survey toward PKS 1830-211
• Shedding light on the formation of the pre-biotic molecule formamide with ASAI
• Formation of Complex Organic Molecules in Cold Interstellar Environments through non-diffusive grain-surface and ice-mantle chemistry
• Seeds Of Life In Space (SOLIS): The organic composition diversity at 300--1000 au scale in Solar-type star forming regions
• The genealogical tree of ethanol: gas-phase formation of glycolaldehyde, acetic acid and formic acid
• Complex organic molecules in the Galactic Centre: the N-bearing family
• Seeds of Life in Space (SOLIS) III. Formamide in protostellar shocks: evidence for gas-phase formation
• Can Formamide Be Formed on Interstellar Ice? An Atomistic Perspective
• Desorption From Interstellar Ices
• Questioning the spatial origin of complex organic molecules in young protostars with the CALYPSO survey
• L1157-B1, a factory of complex organic molecules in a Solar-type star forming region
• Binding energies of interstellar molecules on crystalline and amorphous models of water ice by ab-initio calculations
• ALMA Multi-line Imaging of the Nearby Starburst Galaxy NGC 253
• The Perseus ALMA Chemistry Survey (PEACHES). I. The Complex Organic Molecules in Perseus Embedded Protostars
• 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
• Chemical modelling of complex organic molecules with peptide-like bonds in star-forming regions
• Forming Super Star Clusters in the Central Starburst of NGC 253
• The complex chemistry of hot cores in Sagittarius B2(N): Influence of cosmic-ray ionization and thermal history
• Simultaneous Hydrogenation and UV-photolysis Experiments of NO in CO-rich Interstellar Ice Analogues; linking HNCO, OCN-, NH2CHO and NH2OH
• The Submillimeter Array 1.3 mm line survey of Arp 220
• Interstellar formamide (NH${}_2$CHO), a key prebiotic precursor
• The formation of peptide-like molecules on interstellar dust grains
• Cloud-cloud collision as drivers of the chemical complexity in Galactic Centre molecular clouds
• H-atom bombardment of CO2, HCOOH and CH3CHO containing ices
• Theoretical HDO emission from low-mass protostellar envelopes
• Star-forming Cloud Complexes in the Central Molecular Zone of NGC 253
• ALCHEMI: an ALMA Comprehensive High-resolution Extragalactic Molecular Inventory. Survey presentation and first results from the ACA array
• The (impossible?) formation of acetaldehyde on the grain surfaces: insights from quantum chemical calculations
• An IR study of pure and ion irradiated frozen formamide
• The Stellar Kinematic Center and the True Galactic Nucleus of NGC253
• Quantum mechanical simulations of the radical-radical chemistry on icy surfaces
• Evolutionary study of complex organic molecules in high-mass star-forming regions
• First Abundance Measurement of Organic Molecules in the Atmosphere of HH 212 Protostellar Disk
• Exploring the molecular chemistry and excitation in obscured luminous infrared galaxies: An ALMA mm-wave spectral scan of NGC 4418
• Survey Observations of a Possible Glycine Precursor, Methanimine (CH${}_2$NH)
• ALMA observations of 99 GHz free-free and H40$\alpha$ line emission from star formation in the centre of NGC 253
• The Detection of Hot Cores and Complex Organic Molecules in the Large Magellanic Cloud
• Identification of pre-biotic molecules containing Peptide-like bond in a hot molecular core, G10.47+0.03
• Gas-phase formation of acetaldehyde: review and new theoretical computations
• Formation of NH2CHO and CH3CHO upon UV photoprocessing of interstellar ice analogs
• Radiative and mechanical feedback into the molecular gas of NGC 253
• Chemical segregation of complex organic O-bearing species in Orion KL
• Chemical Diversity in High-Mass Star Formation
• Methylamine and other simple N-bearing species in the hot cores NGC 6334I MM1-3
• Thermal desorption of formamide and methylamine from graphite and amorphous water ice surfaces
• Deuteration of ammonia with D atoms on oxidized partly ASW covered graphite surface
• Formation of complex molecules in translucent clouds: Acetaldehyde, vinyl alcohol, ketene, and ethanol via nonenergetic processing of C2H2 ice
• Chemical Variation among Protostellar Cores: Dependence on Prestellar Core Conditions
• Seeds of Life in Space (SOLIS) V. Methanol and acetaldehyde in the protostellar jet-driven shocks L1157-B0 and B1
• Super Hot Cores in NGC 253: Witnessing the formation and early evolution of Super Star Clusters
• N-bearing complex organics toward high-mass protostars: Constant ratios pointing to formation in similar pre-stellar conditions across a large mass range
• Hydrogenation of accreting C-atoms and CO molecules -- simulating ketene and acetaldehyde formation under dark and translucent cloud conditions
• Seeds of Life in Space (SOLIS). X. Interstellar Complex Organic Molecules in the NGC 1333 IRAS 4A outflows
• Tracing Interstellar Heating: An ALCHEMI Measurement of the HCN Isomers in NGC 253
• CoCCoA: Complex Chemistry in hot Cores with ALMA. Selected oxygen-bearing species
• Survey of Water and Ammonia in Nearby galaxies (SWAN): Resolved Ammonia Thermometry, Water and Methanol Masers in the Nuclear Starburst of NGC 253
• Outflows from Super Star Clusters in the Central Starburst of NGC253
• JOYS+: link between ice and gas of complex organic molecules. Comparing JWST and ALMA data of two low-mass protostars
• Fire in the Heart: A Characterization of the High Kinetic Temperatures and Heating Sources in the Nucleus of NGC253
• Modeling C-Shock Chemistry in Isolated Molecular Outflows
• Chemical modeling for predicting the abundances of certain aldimines and amines in hot cores
• The Difference in Abundances between N-bearing and O-bearing Species in High-Mass Star-Forming Regions
• First extragalactic detection of a phosphorus-bearing molecule with ALCHEMI: phosphorus nitride (PN)
• Formation of Acetaldehyde on CO-rich Ices
• Starburst Energy Feedback Seen Through HCO${}^{+}$/HOC${}^{+}$ Emission in NGC 253 from ALCHEMI
• The two hot corinos of the SVS13-A protostellar binary system: counterposed siblings
• Widespread Presence of Glycolaldehyde and Ethylene Glycol Around Sagittarius B2
• Energizing Star Formation: The Cosmic Ray Ionization Rate in NGC 253 Derived From ALCHEMI Measurements of H${}_3$O${}^{+}$ and SO
• Spectral imaging of the Sagittarius B2 region in multiple 7-mm molecular lines
• Diverse nuclear star-forming activities in the heart of NGC 253 resolved with ten-pc scale ALMA images
• Acetaldehyde binding energies: a coupled experimental and theoretical study
• Observations of CH${}_3$OH and CH${}_3$CHO in a Sample of Protostellar Outflow Sources
• VLA H53alpha and H92alpha line observations of the central region of NGC 253
• Methanol masers in NGC 253 with ALCHEMI
• Mapping Observations of complex organic molecules around Sagittarius B2 with ARO 12m telescope
• Protostellar Interferometric Line Survey of the Cygnus X region (PILS-Cygnus) -- First results: observations of CygX-N30
• A 2-3 mm high-resolution molecular line survey towards the centre of the nearby spiral galaxy NGC 6946
• Sulphur and carbon isotopes towards Galactic centre clouds
• A study of submillimeter methanol absorption toward PKS1830-211: Excitation, invariance of the proton-electron mass ratio, and systematics
• A thorough view of the nuclear region of NGC 253 - Combined Herschel, SOFIA and APEX dataset
• The Molecular ISM in the Super Star Clusters of the Starburst NGC 253
• The NIR structure of the barred galaxy NGC253 from VISTA
• Collisional Excitation and Weak Maser Action of Interstellar Methanimine
• Complex organic molecules detected in twelve high-mass star-forming regions with Atacama Large Millimeter/submillimeter Array (ALMA)
• Formation of the simplest amide in molecular clouds: formamide (NH${}_2$CHO) and its derivatives in H${}_2$O-rich and CO-rich interstellar ice analogs upon VUV irradiation
• Diagnostics of a Nuclear Starburst: Water and Methanol Masers
• The Detection of Hot Molecular Cores in the Small Magellanic Cloud
• Shocking Sgr B2(N1) with its own outflow: A new perspective on segregation between O- and N-bearing molecules
• Enhanced formation of interstellar complex organic molecules on carbon monoxide ice
• ALCHEMI finds a "shocking" carbon footprint in the starburst galaxy NGC~253
• Reconstructing the shock history in the CMZ of NGC 253 with ALCHEMI
• Correlations of Methyl Formate (CH3OCHO), Dimethyl Ether (CH3OCH3) and Ketene (H2CCO) in High-mass Star-forming Regions
• Complex organic molecules uncover deeply embedded precursors of hot cores
• The Opaque Heart of the Galaxy IC 860: Analogous Protostellar, Kinematics, Morphology, and Chemistry
• The physical and chemical structure of Sagittarius B2, VIII. Full molecular line survey of hot cores
• A study of three southern high-mass star-forming regions
• On Modelling Sputtering of Interstellar Grain Ices
• An ALCHEMI inspection of sulphur-bearing species towards the central molecular zone of NGC 253
• Binding energies of ethanol and ethylamine on interstellar water ices: synergy between theory and experiments
• The Cosmic-Ray Induced Sputtering Process On Icy Grains

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