S. Viti
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View article: Chemical templates of the Central Molecular Zone
Chemical templates of the Central Molecular Zone Open
Context . The Central Molecular Zone (CMZ) of the Milky Way exhibits extreme conditions, including high gas densities, elevated temperatures, enhanced cosmic-ray ionization rates, and large-scale dynamics. This makes it a perfect laborator…
View article: FAUST
FAUST Open
Context . The (sub-)millimetre dust opacity spectral index ( β ) is a critical observable for constraining dust properties, such as the maximum grain size of an observed dust population. It has been widely measured at Galactic scales and d…
View article: NeuralPDR: neural differential equations as surrogate models for photodissociation regions
NeuralPDR: neural differential equations as surrogate models for photodissociation regions Open
Computational astrochemical models are essential for helping us interpret and understand the observations of different astrophysical environments. In the age of high-resolution telescopes such as JWST and ALMA, the substructure of many obj…
View article: The rich JWST spectrum of the western nucleus of Arp 220: Shocked hot core chemistry dominates the inner disc
The rich JWST spectrum of the western nucleus of Arp 220: Shocked hot core chemistry dominates the inner disc Open
We present full 3–28 μm JWST MIRI/MRS and NIRSpec/IFU spectra of the western nucleus of Arp 220, the nearest ultraluminous infrared galaxy. This nucleus has long been suggested to possibly host an embedded Compton-thick AGN. Millimetre obs…
View article: Investigating the chemical link between H<sub>2</sub>CO and CH<sub>3</sub>OH within the central molecular zone of NGC 253
Investigating the chemical link between H<sub>2</sub>CO and CH<sub>3</sub>OH within the central molecular zone of NGC 253 Open
Context. The formaldehyde (H 2 CO) and methanol (CH 3 OH) molecules have served as traditional tracers of the star formation process for decades. Studies of the environments that produce formaldehyde and methanol emission, though, have poi…
View article: Atacama Large Aperture Submillimeter Telescope (AtLAST) science: Gas and dust in nearby galaxies
Atacama Large Aperture Submillimeter Telescope (AtLAST) science: Gas and dust in nearby galaxies Open
Understanding the physical processes that regulate star formation and galaxy evolution are major areas of activity in modern astrophysics. Nearby galaxies offer unique opportunities to inspect interstellar medium (ISM), star formation (SF)…
View article: Understanding molecular ratios in the carbon- and oxygen-poor outer Milky Way with interpretable machine learning
Understanding molecular ratios in the carbon- and oxygen-poor outer Milky Way with interpretable machine learning Open
Context . The outer Milky Way has a lower metallicity than our solar neighbourhood, but many molecules are still detected in the region. Molecular line ratios can serve as probes to understand the chemistry and physics in these regions bet…
View article: Hydrodynamic simulations of the Disc of Gas Around Supermassive black holes (HDGAS) – II. The transition from neutral atomic to molecular gas phases
Hydrodynamic simulations of the Disc of Gas Around Supermassive black holes (HDGAS) – II. The transition from neutral atomic to molecular gas phases Open
We use HDGAS (Hydrodynamic simulations of the Disc of Gas Around Supermassive black holes) hydrodynamic simulations to study the impact of active galactic nucleus (AGN) feedback on the conversion of atomic gas to molecular gas within the c…
View article: ALMA uncovers optically thin and multi-component CO gas in the outflowing circumnuclear disk of NGC1068
ALMA uncovers optically thin and multi-component CO gas in the outflowing circumnuclear disk of NGC1068 Open
Active galactic nuclei (AGNs) influence their host galaxies through winds and jets that can drive molecular outflows, traceable with CO line emissions using the Atacama Large Millimeter Array (ALMA). Recent studies leveraging ALMA data hav…
View article: Modelling methanol and hydride formation in the JWST Ice Age era
Modelling methanol and hydride formation in the JWST Ice Age era Open
Context. Recent JWST observations have measured the ice chemical composition towards two highly extinguished background stars, NIR38 and J110621, in the Chamaeleon I molecular cloud. The observed excess of extinction on the long-wavelength…
View article: FAUST
FAUST Open
Context . While protostellar outflows are important in terms of mass accretion and angular momentum transport in star formation processes, high-resolution observations of outflows in protobinary systems are still sparse. Aims . We aim to r…
View article: Evidence for Jet/Outflow Shocks Heating the Environment around the Class I Protostellar Source Elias 29: FAUST XXI
Evidence for Jet/Outflow Shocks Heating the Environment around the Class I Protostellar Source Elias 29: FAUST XXI Open
We have observed the late Class I protostellar source Elias 29 at a spatial resolution of 70 au with the Atacama Large Millimeter/submillimeter Array as part of the FAUST Large Program. We focus on the line emission of SO, while that of 34…
View article: Modelling methanol and hydride formation in the JWST Ice Age era
Modelling methanol and hydride formation in the JWST Ice Age era Open
(Abridged) JWST observations have measured the ice composition toward two highly-extinguished field stars in the Chamaeleon I cloud. The observed extinction excess on the long-wavelength side of the H2O ice band at 3 micron has been attrib…
View article: The Rich JWST Spectrum of the Western Nucleus of Arp 220: Shocked Hot Core Chemistry Dominates the Inner Disk
The Rich JWST Spectrum of the Western Nucleus of Arp 220: Shocked Hot Core Chemistry Dominates the Inner Disk Open
We present full 3-28 $\mathrm{μm}$ JWST MIRI/MRS and NIRSpec/IFU spectra of the western nucleus of Arp 220, the nearest ultraluminous infrared galaxy. This nucleus has long been suggested to possibly host an embedded Compton-thick AGN. Mil…
View article: The JCMT Gould Belt Survey: First results from the Corona Australis molecular cloud and evidence of variable dust emissivity indices in the Coronet region
The JCMT Gould Belt Survey: First results from the Corona Australis molecular cloud and evidence of variable dust emissivity indices in the Coronet region Open
We present 450$μ$m and 850$μ$m James Clerk Maxwell Telescope (JCMT) observations of the Corona Australis (CrA) molecular cloud taken as part of the JCMT Gould Belt Legacy Survey (GBLS). We present a catalogue of 39 starless and protostella…
View article: The JCMT Gould Belt Survey: first results from the Corona Australis molecular cloud and evidence of variable dust emissivity indices in the Coronet region
The JCMT Gould Belt Survey: first results from the Corona Australis molecular cloud and evidence of variable dust emissivity indices in the Coronet region Open
We present 450 and 850 $\mu$m James Clerk Maxwell Telescope (JCMT) observations of the Corona Australis (CrA) molecular cloud taken as part of the JCMT Gould Belt Legacy Survey (GBLS). We present a catalogue of 39 starless and protostellar…
View article: Ice inventory towards the protostar Ced 110 IRS4 observed with the James Webb Space Telescope. Results from the Early Release Science Ice Age program
Ice inventory towards the protostar Ced 110 IRS4 observed with the James Webb Space Telescope. Results from the Early Release Science Ice Age program Open
Protostars contain icy ingredients necessary for the formation of potential habitable worlds, therefore, it is crucial to understand their chemical and physical environments. This work is focused on the ice features towards the binary prot…
View article: Interaction between the supernova remnant W44 and the infrared dark cloud G034.77-00.55: Shock induced star formation
Interaction between the supernova remnant W44 and the infrared dark cloud G034.77-00.55: Shock induced star formation Open
Context . We have studied the dense gas morphology and kinematics towards the infrared dark cloud (IRDC) G034.77-00.55, shock-interacting with the SNR W44, to identify evidence of early-stage star formation induced by the shock. Aims . We …
View article: First detection of a deuterated molecule in a starburst environment within NGC 253
First detection of a deuterated molecule in a starburst environment within NGC 253 Open
Context. Deuterium was primarily created during the Big Bang nucleosynthesis. This fact, alongside its fractionation reactions resulting in enhanced abundances of deuterated molecules, means that deuterium abundances can be used to better …
View article: 3D-PDR Orion dataset and NeuralPDR: Neural Differential Equations for Photodissociation Regions
3D-PDR Orion dataset and NeuralPDR: Neural Differential Equations for Photodissociation Regions Open
We present a novel dataset of simulations of the photodissociation region (PDR) in the Orion Bar and provide benchmarks of emulators for the dataset. Numerical models of PDRs are computationally expensive since the modeling of these changi…
View article: Neural Network Constraints on the Cosmic-Ray Ionization Rate and Other Physical Conditions in NGC 253 with ALCHEMI Measurements of HCN and HNC
Neural Network Constraints on the Cosmic-Ray Ionization Rate and Other Physical Conditions in NGC 253 with ALCHEMI Measurements of HCN and HNC Open
We use a neural network model and Atacama Large Millimeter/submillimeter Array (ALMA) observations of HCN and HNC to constrain the physical conditions, most notably the cosmic-ray ionization rate (CRIR, ζ ), in the Central Molecular Zone (…
View article: Ice inventory towards the protostar Ced 110 IRS4 observed with the James Webb Space Telescope. Results from the ERS Ice Age program
Ice inventory towards the protostar Ced 110 IRS4 observed with the James Webb Space Telescope. Results from the ERS Ice Age program Open
This work focuses on the ice features toward the binary protostellar system Ced 110 IRS 4A and 4B, and observed with JWST as part of the Early Release Science Ice Age collaboration. We aim to explore the JWST observations of the binary pro…
View article: First detection of a deuterated molecule in a starburst environment within NGC 253
First detection of a deuterated molecule in a starburst environment within NGC 253 Open
Deuterium was primarily created during the Big Bang Nucleosynthesis (BBN). This fact, alongside its fractionation reactions resulting in enhanced abundances of deuterated molecules, means that these abundances can be used to better underst…
View article: Interaction between the Supernova Remnant W44 and the Infrared Dark Cloud G034.77-00.55: shock induced star formation?
Interaction between the Supernova Remnant W44 and the Infrared Dark Cloud G034.77-00.55: shock induced star formation? Open
How Supernova Remnant (SNR) shocks impact nearby molecular clouds is still poorly observationally constrained. It is unclear if SNRs can positively or negatively affect clouds star formation potential. We have studied the dense gas morphol…
View article: Components of star formation in NGC 253 : Non-negative Matrix Factorization Analysis with the ALCHEMI integrated intensity images
Components of star formation in NGC 253 : Non-negative Matrix Factorization Analysis with the ALCHEMI integrated intensity images Open
It is essential to examine the physical or chemical properties of molecular gas in starburst galaxies to reveal the underlying mechanisms characterizing starbursts. We used non-negative matrix factorization (NMF) to extract individual mole…
View article: Components of star formation in NGC 253: Non-negative matrix factorization analysis with the ALCHEMI integrated intensity images
Components of star formation in NGC 253: Non-negative matrix factorization analysis with the ALCHEMI integrated intensity images Open
It is essential to examine the physical or chemical properties of molecular gas in starburst galaxies to reveal the underlying mechanisms characterizing starbursts. We used non-negative matrix factorization (NMF) to extract individual mole…
View article: Neural Network Constraints on the Cosmic-Ray Ionization Rate and Other Physical Conditions in NGC 253 with ALCHEMI Measurements of HCN and HNC
Neural Network Constraints on the Cosmic-Ray Ionization Rate and Other Physical Conditions in NGC 253 with ALCHEMI Measurements of HCN and HNC Open
We use a neural network model and ALMA observations of HCN and HNC to constrain the physical conditions, most notably the cosmic-ray ionization rate (CRIR, zeta), in the Central Molecular Zone (CMZ) of the starburst galaxy NGC 253. Using o…
View article: Filamentary mass accretion towards the high-mass protobinary system G11.92–0.61 MM2
Filamentary mass accretion towards the high-mass protobinary system G11.92–0.61 MM2 Open
We present deep, sub-arcsecond ($\sim$2000 au) resolution ALMA 0.82-mm observations of the former high-mass prestellar core candidate G11.92–0.61 MM2, recently shown to be an $\sim$500 au-separation protobinary. Our observations show that …
View article: Detection of antifreeze molecule ethylene glycol in the hot molecular core G358.93–0.03 MM1
Detection of antifreeze molecule ethylene glycol in the hot molecular core G358.93–0.03 MM1 Open
The identification of complex pre-biotic molecules using millimetre and submillimetre telescopes allows us to understand how the basic building blocks of life are formed in the universe. In the interstellar medium, ethylene glycol ($({\rm …
View article: FAUST
FAUST Open
Context. Recent observations suggest that planet formation starts early, in protostellar disks of ≤10 5 yr, which are characterized by strong interactions with the environment, such as through accretion streamers and molecular outflows. Ai…