4 papers
A multi-scale investigation into the diagnostic potential of the HCN/HCO ratio for AGN and starburst activity in nearby galaxies
J. Butterworth, S. Viti, Y. Wang
(Abridged) The identification of AGN and SB regions in galaxies is crucial for understanding the role of various physical processes in galaxy evolution. Molecular line ratios, such…
First detection of a deuterated molecule in a starburst environment within NGC 253
J. Butterworth, S. MartÃn, V. M. Rivilla +7
Deuterium was primarily created during the Big Bang Nucleosynthesis (BBN). This fact, alongside its fractionation reactions resulting in enhanced abundances of deuterated molecules…
Neural Network Constraints on the Cosmic-Ray Ionization Rate and Other Physical Conditions in NGC 253 with ALCHEMI Measurements of HCN and HNC
Erica Behrens, Jeffrey G. Mangum, Serena Viti +15
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 Mo…
An ALCHEMI inspection of sulphur-bearing species towards the central molecular zone of NGC 253
M. Bouvier, S. Viti, E. Behrens +19
Sulphur-bearing species are detected in various environments within Galactic star-forming regions and are particularly abundant in the gas phase of outflows and shocks, and photo-d…