Alex R. Pettitt
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View article: Self-consistent modelling of the Milky Way structure using live potentials
Self-consistent modelling of the Milky Way structure using live potentials Open
To advance our understanding of the evolution of the interstellar medium (ISM) of our Galaxy, numerical models of Milky Way (MW) type galaxies are widely used. However, most models only vaguely resemble the MW (e.g. in total mass), and oft…
View article: Self-consistent modelling of the Milky Way structure using live potentials
Self-consistent modelling of the Milky Way structure using live potentials Open
To advance our understanding of the evolution of the interstellar medium (ISM) of our Galaxy, numerical models of Milky Way (MW) type galaxies are widely used. However, most models only vaguely resemble the MW (e.g. in total mass), and oft…
View article: JASMINE: Near-infrared astrometry and time-series photometry science
JASMINE: Near-infrared astrometry and time-series photometry science Open
The Japan Astrometry Satellite Mission for INfrared Exploration (JASMINE) is a planned M-class science space mission by the Institute of Space and Astronautical Science, the Japan Aerospace Exploration Agency. JASMINE has two main science …
View article: The impact of bar origin and morphology on stellar migration
The impact of bar origin and morphology on stellar migration Open
Different mechanisms driving bar structure formation indicate that bar origins should be distinguishable in the stellar populations of galaxies. To study how these origins affect different bar morphologies and impact stellar orbits and mig…
View article: The impact of bar origin and morphology on stellar migration
The impact of bar origin and morphology on stellar migration Open
Different mechanisms driving bar structure formation indicate that bar origins should be distinguishable in the stellar populations of galaxies. To study how these origins affect different bar morphologies and impact stellar orbits and mig…
View article: JASMINE: Near-Infrared Astrometry and Time Series Photometry Science
JASMINE: Near-Infrared Astrometry and Time Series Photometry Science Open
Japan Astrometry Satellite Mission for INfrared Exploration (JASMINE) is a planned M-class science space mission by the Institute of Space and Astronautical Science, the Japan Aerospace Exploration Agency. JASMINE has two main science goal…
View article: Star cluster formation and feedback in different environments of a Milky Way-like galaxy
Star cluster formation and feedback in different environments of a Milky Way-like galaxy Open
It remains unclear how galactic environment affects star formation and stellar cluster properties. This is difficult to address in Milky Way-mass galaxy simulations because of limited resolution and less accurate feedback compared to cloud…
View article: Star cluster formation and feedback in different environments of a Milky Way-like galaxy
Star cluster formation and feedback in different environments of a Milky Way-like galaxy Open
It remains unclear how galactic environment affects star formation and stellar cluster properties. This is difficult to address in Milky Way-mass galaxy simulations because of limited resolution and less accurate feedback compared to cloud…
View article: Large-scale velocity-coherent filaments in the SEDIGISM survey: Association with spiral arms and the fraction of dense gas
Large-scale velocity-coherent filaments in the SEDIGISM survey: Association with spiral arms and the fraction of dense gas Open
Context. Filamentary structures in the interstellar medium are closely related to star formation. It is possible that the dense gas mass fraction (DGMF) or clump formation efficiency in large-scale filaments determine whether or not they e…
View article: The formation of clusters and OB associations in different density spiral arm environments
The formation of clusters and OB associations in different density spiral arm environments Open
We present simulations of the formation and evolution of clusters in spiral arms. The simulations follow two different spiral arm regions, and the total gas mass is varied to produce a range of different mass clusters. We find that includi…
View article: Massive core/star formation triggered by cloud-cloud collision: II High-speed collisions of magnetized clouds
Massive core/star formation triggered by cloud-cloud collision: II High-speed collisions of magnetized clouds Open
We study the effects of the magnetic fields on the formation of massive, self-gravitationally bound cores (MBCs) in high-speed cloud-cloud collisions (CCCs). Extending our previous work (Sakre et al. 2021), we perform magnetohydrodynamic s…
View article: Multiwavelength and Multi-CO View of the Minor Merger Driven Star Formation in the Nearby LIRG NGC 3110
Multiwavelength and Multi-CO View of the Minor Merger Driven Star Formation in the Nearby LIRG NGC 3110 Open
We present Atacama Large Millimeter/submillimeter Array observations of multiple 12 CO, 13 CO, and C 18 O lines and 2.9 mm and 1.3 mm continuum emission toward the nearby interacting luminous infrared galaxy NGC 3110, supplemented with sim…
View article: Differences in star formation activity between tidally triggered and isolated bars: a case study of NGC 4303 and NGC 3627
Differences in star formation activity between tidally triggered and isolated bars: a case study of NGC 4303 and NGC 3627 Open
Galactic bars are important drivers of galactic evolution, and yet how they impact the interstellar medium and correspondingly star formation, remains unclear. We present simulation results for two barred galaxies with different formation …
View article: The formation of massive stellar clusters in converging galactic flows with photoionization
The formation of massive stellar clusters in converging galactic flows with photoionization Open
We have performed simulations of cluster formation along two regions of a spiral arm taken from a global Milky Way simulation, including photoionizing feedback. One region is characterized by strongly converging flows, the other represents…
View article: The SEDIGISM survey: The influence of spiral arms on the molecular gas distribution of the inner Milky Way
The SEDIGISM survey: The influence of spiral arms on the molecular gas distribution of the inner Milky Way Open
The morphology of the Milky Way is still a matter of debate. In order to shed light on uncertainties surrounding the structure of the Galaxy, in this paper, we study the imprint of spiral arms on the distribution and properties of its mole…
View article: The SEDIGISM survey: The influence of spiral arms on the molecular gas distribution of the inner Milky Way
The SEDIGISM survey: The influence of spiral arms on the molecular gas distribution of the inner Milky Way Open
The morphology of the Milky Way is still a matter of debate. In order to shed light on uncertainties surrounding the structure of the Galaxy, in this paper, we study the imprint of spiral arms on the distribution and properties of its mole…
View article: Birth sites of young stellar associations and recent star formation in a flocculent corrugated disc
Birth sites of young stellar associations and recent star formation in a flocculent corrugated disc Open
With backwards orbit integration, we estimate birth locations of young stellar associations and moving groups identified in the solar neighbourhood that are younger than 70 Myr. The birth locations of most of these stellar associations are…
View article: The anatomy of a star-forming galaxy II: FUV heating via dust
The anatomy of a star-forming galaxy II: FUV heating via dust Open
Far-ultraviolet (FUV) radiation greatly exceeds UV, supernovae (SNe), and winds in the energy budget of young star clusters but is poorly modelled in galaxy simulations. We present results of the first isolated galaxy disc simulations to i…
View article: SEDIGISM-ATLASGAL: dense gas fraction and star formation efficiency across the Galactic disc
SEDIGISM-ATLASGAL: dense gas fraction and star formation efficiency across the Galactic disc Open
By combining two surveys covering a large fraction of the molecular material in the Galactic disc, we investigate the role spiral arms play in the star formation process. We have matched clumps identified by APEX Telescope Large Area Surve…
View article: The SEDIGISM survey: molecular clouds in the inner Galaxy
The SEDIGISM survey: molecular clouds in the inner Galaxy Open
We use the 13CO (2–1) emission from the SEDIGISM (Structure, Excitation, and Dynamics of the Inner Galactic InterStellar Medium) high-resolution spectral-line survey of the inner Galaxy, to extract the molecular cloud population with a lar…
View article: The SEDIGISM survey: First Data Release and overview of the Galactic structure
The SEDIGISM survey: First Data Release and overview of the Galactic structure Open
The SEDIGISM (Structure, Excitation and Dynamics of the Inner Galactic Interstellar Medium) survey used the APEX telescope to map 84 deg2 of the Galactic plane between ℓ = −60° and +31° in several molecular transitions, including 13CO (2 –…
View article: How do different spiral arm models impact the ISM and GMC population?
How do different spiral arm models impact the ISM and GMC population? Open
The nature of galactic spiral arms in disc galaxies remains elusive. Regardless of the spiral model, arms are expected to play a role in sculpting the star-forming interstellar medium (ISM). As such, different arm models may result in diff…
View article: The power of coordinate transformations in dynamical interpretations of Galactic structure
The power of coordinate transformations in dynamical interpretations of Galactic structure Open
Gaia DR2 has provided an unprecedented wealth of information about the positions and motions of stars in our Galaxy and has highlighted the degree of disequilibria in the disc. As we collect data over a wider area of the disc, it becomes i…
View article: The Anatomy of a Star-Forming Galaxy II: the role of FUV heating in the structure of galaxies
The Anatomy of a Star-Forming Galaxy II: the role of FUV heating in the structure of galaxies Open
Far-Ultraviolet (FUV) radiation greatly exceeds ultraviolet, supernovae and winds in the energy budget of young star clusters but is poorly modelled in galaxy simulations. We present results of the first full isolated galaxy disk simulatio…
View article: Young stars as tracers of a barred-spiral Milky Way
Young stars as tracers of a barred-spiral Milky Way Open
Identifying the structure of our Galaxy has always been fraught with difficulties, and while modern surveys continue to make progress building a map of the Milky Way, there is still much to understand. The arm and bar features are importan…
View article: A Tale of Two Clump Masses: A new way to study clump formation in simulations
A Tale of Two Clump Masses: A new way to study clump formation in simulations Open
We present a new method to study the characteristic scales of collapse and fragmentation in galactic disks. Clump formation is seeded in simulations via controlled perturbations with a specified wavelength and velocity. These are applied t…
View article: Comparing the properties of GMCs in M33 from simulations and observations
Comparing the properties of GMCs in M33 from simulations and observations Open
We compare the properties of clouds in simulated M33 galaxies to those observed in the real M33. We apply a friends of friends algorithm and CPROPS to identify clouds, as well as a pixel by pixel analysis. We obtain very good agreement bet…
View article: Molecular Gas and Star Formation Properties in Early Stage Mergers: SMA CO(2-1) Observations of the LIRGs NGC 3110 and NGC 232
Molecular Gas and Star Formation Properties in Early Stage Mergers: SMA CO(2-1) Observations of the LIRGs NGC 3110 and NGC 232 Open
Mergers of galaxies are an important mode for galaxy evolution because they serve as an efficient trigger of powerful starbursts. However, observational studies of molecular gas properties during their early stages are scarce. We present i…
View article: The changing GMC population in galaxy interactions
The changing GMC population in galaxy interactions Open
With the advent of modern observational efforts providing extensive giant molecular cloud catalogues, understanding the evolution of such clouds in a galactic context is of prime importance. While numerous previous numerical and theoretica…
View article: Simulations of the flocculent spiral M33: what drives the spiral structure?
Simulations of the flocculent spiral M33: what drives the spiral structure? Open
We perform simulations of isolated galaxies in order to investigate the\nlikely origin of the spiral structure in M33. In our models, we find that\ngravitational instabilities in the stars and gas are able to reproduce the\nobserved spiral…