Thomas M. Callingham
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View article: Chronology of our Galaxy from <i>Gaia</i> colour–magnitude diagram fitting (ChronoGal)
Chronology of our Galaxy from <i>Gaia</i> colour–magnitude diagram fitting (ChronoGal) Open
Context . Investigation of the formation, origin, and evolution of the dichotomy of the Milky Way’s thin and thick disc components has been a focal point of research since it is key to understanding the formation of our Galaxy. One difficu…
View article: Chronology of our Galaxy from <i>Gaia</i> colour-magnitude diagram fitting (ChronoGal)
Chronology of our Galaxy from <i>Gaia</i> colour-magnitude diagram fitting (ChronoGal) Open
Context . Gaia -Sausage-Enceladus is considered the last major merger that contributed to the formation of the Milky Way. Its remnants dominate the nearby accreted stellar halo of the Milky Way. Aims . We aim to characterise the star forma…
View article: Group accretion in Milky Way-like stellar haloes
Group accretion in Milky Way-like stellar haloes Open
As galaxies form hierarchically, larger satellites can accrete alongside smaller companions in group infall events. This coordinated accretion is likely to have left signatures in the Milky Way's stellar halo that we can see today. Our goa…
View article: Chemical characterisation of small substructures in the local stellar halo
Chemical characterisation of small substructures in the local stellar halo Open
The local stellar halo of the Milky Way is known to contain the debris from accreted dwarf galaxies and globular clusters in the form of stellar streams and over-densities in the space of orbital properties (e.g. integrals of motion). Whil…
View article: Characterisation of local halo building blocks: Thamnos and Sequoia
Characterisation of local halo building blocks: Thamnos and Sequoia Open
Context . A crucial aspect of galaxy evolution is the pace at which galaxies build up their mass. We can investigate this hierarchical assembly by uncovering and timing accretion events experienced by our Galaxy. Aims . In the Milky Way, a…
View article: Assessing the robustness of the Galactic rotation curve inferred from the Jeans equations using <i>Gaia</i> DR3 and cosmological simulations
Assessing the robustness of the Galactic rotation curve inferred from the Jeans equations using <i>Gaia</i> DR3 and cosmological simulations Open
Context . Several authors have recently applied Jeans modelling to Gaia -based datasets to infer the circular velocity curve for the Milky Way. These works have consistently found evidence for a continuous decline in the rotation curve bey…
View article: Characterisation of local halo building blocks: Thamnos and Sequoia
Characterisation of local halo building blocks: Thamnos and Sequoia Open
A crucial aspect of galaxy evolution is the pace at which galaxies build up their mass. We investigate this hierarchical assembly by uncovering and timing accretion events experienced by our Galaxy. In the Milky Way, accreted debris has be…
View article: Filling in the blanks. A method to infer the substructure membership and dynamics of 5D stars
Filling in the blanks. A method to infer the substructure membership and dynamics of 5D stars Open
In the solar neighbourhood, only $ of stars in the survey have a line-of-sight velocity ( contained within the RVS catalogue. These limitations restrict conventional dynamical analysis, such as finding and studying substructures in the ste…
View article: The 33 <i>M</i><sub>⊙</sub> black hole <i>Gaia</i> BH3 is part of the disrupted ED-2 star cluster
The 33 <i>M</i><sub>⊙</sub> black hole <i>Gaia</i> BH3 is part of the disrupted ED-2 star cluster Open
Context. The Gaia Collaboration has recently reported the detection of a 33 M ⊙ black hole in a wide binary system located in the solar neighbourhood. Aims. Here we explore the relationship between this black hole, known as Gaia BH3, and t…
View article: On the Galactic rotation curve inferred from the Jeans equations Assessing its robustness using Gaia DR3 and cosmological simulations
On the Galactic rotation curve inferred from the Jeans equations Assessing its robustness using Gaia DR3 and cosmological simulations Open
Several works have recently applied Jeans modelling to Gaia-based datasets to infer the circular velocity curve for the Milky Way. Such works have consistently found evidence for a continuous decline in the rotation curve beyond $\sim$15kp…
View article: Can we really pick and choose? Benchmarking various selections of <i>Gaia</i> Enceladus/Sausage stars in observations with simulations
Can we really pick and choose? Benchmarking various selections of <i>Gaia</i> Enceladus/Sausage stars in observations with simulations Open
Large spectroscopic surveys plus Gaia astrometry have shown us that the inner stellar halo of the Galaxy is dominated by the debris of Gaia Enceladus/Sausage (GES). With the richness of data at hand, there are a myriad of ways these accret…
View article: ED-2: A cold but not so narrow stellar stream crossing the solar neighbourhood
ED-2: A cold but not so narrow stellar stream crossing the solar neighbourhood Open
Context. ED-2 is a stellar stream identified as a compact group in integrals-of-motion space in a local sample of halo stars from the third Gaia data release. Aims. We investigate its nature and possible association with known halo substru…
View article: ED-2: a cold but not so narrow stellar stream crossing the Solar neighbourhood
ED-2: a cold but not so narrow stellar stream crossing the Solar neighbourhood Open
ED-2 is a stellar stream identified as a compact group in integrals of motion space in a local sample of halo stars from the third Gaia data release. Here we investigate its nature and possible association with known halo substructures. We…
View article: Can we really pick and choose? Benchmarking various selections of Gaia Enceladus/Sausage stars in observations with simulations
Can we really pick and choose? Benchmarking various selections of Gaia Enceladus/Sausage stars in observations with simulations Open
Large spectroscopic surveys plus Gaia astrometry have shown us that the inner stellar halo of the Galaxy is dominated by the debris of Gaia Enceladus/Sausage (GES). With the richness of data at hand, there are a myriad of ways these accret…
View article: <i>Gaia</i> DR3 view of dynamical substructure in the stellar halo near the Sun
<i>Gaia</i> DR3 view of dynamical substructure in the stellar halo near the Sun Open
Context. Debris from past merger events is expected and also known, to some extent, to populate the stellar halo near the Sun. Aims. We aim to identify and characterise such merger debris using Gaia DR3 data supplemented with metallicity a…
View article: The Gaia DR3 view of dynamical substructure in the stellar halo near the Sun
The Gaia DR3 view of dynamical substructure in the stellar halo near the Sun Open
The debris from past merger events is expected and, to some extent, known to populate the stellar halo near the Sun. We aim to identify and characterise such merger debris using Gaia DR3 data supplemented by metallicity and chemical abunda…
View article: The chemo-dynamical groups of Galactic globular clusters
The chemo-dynamical groups of Galactic globular clusters Open
We introduce a multicomponent chemo-dynamical method for splitting the Galactic population of globular clusters (GCs) into three distinct constituents: bulge, disc, and stellar halo. The latter is further decomposed into the individual lar…
View article: The orbital phase space of contracted dark matter haloes
The orbital phase space of contracted dark matter haloes Open
We study the orbital phase space of dark matter (DM) haloes in the auriga suite of cosmological hydrodynamics simulations of Milky Way (MW) analogues. We characterize haloes by their spherical action distribution, $F\left(J_{{r}},L\right)$…
View article: Milky Way mass profile
Milky Way mass profile Open
Python code that implements the dark matter halo contraction given in Cautun et al (2020) and the best fitting Milky Way mass profile given the latest Gaia DR2 rotation curve of our galaxy.
View article: The mass of the Milky Way from satellite dynamics
The mass of the Milky Way from satellite dynamics Open
We present and apply a method to infer the mass of the Milky Way (MW) by comparing the dynamics of MW satellites to those of model satellites in the eagle cosmological hydrodynamics simulations. A distribution function (DF) for galactic sa…