51 citations · 102 across the 11 of their papers we have counts for
11 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. Martín, 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…
A Comparative Study of the Ground State Transitions of CO and [C I] as Molecular Gas Tracers at High Redshift
Marta Frias Castillo, Matus Rybak, Jacqueline A. Hodge +22
The CO(1--0) and [\ion{C}{1}](1--0) emission lines are well-established tracers of cold molecular gas mass in local galaxies. At high redshift, where the interstellar medium (ISM)…
Molecular isotopologue measurements toward super star clusters and the relation to their ages in NGC253 with ALCHEMI
J. Butterworth, S. Viti, P. P. Van der Werf +18
Determining the evolution of the CNO isotopes in the interstellar medium (ISM) of starburst galaxies can yield important constraints on the ages of superstar clusters (SSCs), or on…
Volume density structure of the NGC253 CMZ through ALCHEMI excitation analysis
Kunihiko Tanaka, Jeffrey G. Mangum, Serena Viti +21
We present a spatially-resolved excitation analysis for the central molecular zone (CMZ) of the starburst galaxy NGC 253 using the data from the ALMA Large program ALCHEMI, whereby…
Understanding Molecular Abundances in Star-Forming Regions Using Interpretable Machine Learning
Johannes Heyl, Joshua Butterworth, Serena Viti
Astrochemical modelling of the interstellar medium typically makes use of complex computational codes with parameters whose values can be varied. It is not always clear what the ex…
Understanding if molecular ratios can be used as diagnostics of AGN and starburst activity: The case of NGC 1068
J. Butterworth, J. Holdship, S. Viti +1
Molecular line ratios, such as HCN(1-0)/HCO(1-0) and HCN(4-3)/CS(7-6), are routinely used to identify active galactic nuclei (AGN) activity in galaxies. Such ratios are, howeve…
The evolution of the UV luminosity and stellar mass functions of Lyman-alpha emitters from z~2 to z~6
Sérgio Santos, David Sobral, Josh Butterworth +7
We measure the evolution of the rest-frame UV luminosity function (LF) and the stellar mass function (SMF) of Lyman-alpha (Lya) emitters (LAEs) from z~2 to z~6 by exploring ~4000 L…
The evolution of rest-frame UV properties, Lya EWs and the SFR-Stellar mass relation at z~2-6 for SC4K LAEs
Sérgio Santos, David Sobral, Jorryt Matthee +6
We explore deep rest-frame UV to FIR data in the COSMOS field to measure the individual spectral energy distributions (SED) of the ~4000 SC4K (Sobral et al. 2018) Lyman-alpha (Lya)…