Outputs (94)

The local high-velocity tail and the Galactic escape speed (2019)
Journal Article
Deason, A. J., Fattahi, A., Belokurov, V., Evans, N. W., Grand, R. J., Marinacci, F., & Pakmor, R. (2019). The local high-velocity tail and the Galactic escape speed. Monthly Notices of the Royal Astronomical Society, 485(3), 3514-3526. https://doi.org/10.1093/mnras/stz623

We model the fastest moving (⁠v tot >300kms −1 vtot>300kms−1 ⁠) local (D ≲ 3 kpc) halo stars using cosmological simulations and six-dimensional Gaia data. Our approach is to use our knowledge of the assembly history and phase-space distribution of ha... Read More about The local high-velocity tail and the Galactic escape speed.

The mass of the Milky Way from satellite dynamics (2019)
Journal Article
Callingham, T. M., Cautun, M., Deason, A. J., Frenk, C. S., Wang, W., Gómez, F. A., Grand, R. J., Marinacci, F., & Pakmor, R. (2019). The mass of the Milky Way from satellite dynamics. Monthly Notices of the Royal Astronomical Society, 484(4), 5453-5467. https://doi.org/10.1093/mnras/stz365

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 satellites is... Read More about The mass of the Milky Way from satellite dynamics.

The origin of galactic metal-rich stellar halo components with highly eccentric orbits (2019)
Journal Article
Fattahi, A., Belokurov, V., Deason, A. J., Frenk, C. S., Gómez, F. A., Grand, R. J., Marinacci, F., Pakmor, R., & Springel, V. (2019). The origin of galactic metal-rich stellar halo components with highly eccentric orbits. Monthly Notices of the Royal Astronomical Society, 484(4), 4471-4483. https://doi.org/10.1093/mnras/stz159

Using the astrometry from the ESA’s Gaia mission, previous works have shown that the Milky Way stellar halo is dominated by metal-rich stars on highly eccentric orbits. To shed light on the nature of this prominent halo component, we have analysed 28... Read More about The origin of galactic metal-rich stellar halo components with highly eccentric orbits.

The aftermath of the Great Collision between our Galaxy and the Large Magellanic Cloud (2018)
Journal Article
Cautun, M., Deason, A. J., Frenk, C. S., & McAlpine, S. (2018). The aftermath of the Great Collision between our Galaxy and the Large Magellanic Cloud. Monthly Notices of the Royal Astronomical Society, 483(2), 2185-2196. https://doi.org/10.1093/mnras/sty3084

The Milky Way (MW) offers a uniquely detailed view of galactic structure and is often regarded as a prototypical spiral galaxy. But recent observations indicate that the MW is atypical: it has an undersized supermassive black hole at its centre; it i... Read More about The aftermath of the Great Collision between our Galaxy and the Large Magellanic Cloud.

Aurigaia: mock Gaia DR2 stellar catalogues from the Auriga cosmological simulations (2018)
Journal Article
Grand, R., Helly, J., Fattahi, A., Cautun, M., Cole, S., Cooper, A., Deason, A., Frenk, C., Gómez, F., Hunt, J., Marinacci, F., Pakmor, R., Simpson, C., Springel, V., & Xu, D. (2018). Aurigaia: mock Gaia DR2 stellar catalogues from the Auriga cosmological simulations. Monthly Notices of the Royal Astronomical Society, 481(2), 1726-1743. https://doi.org/10.1093/mnras/sty2403

We present and analyse mock stellar catalogues that match the selection criteria and observables (including uncertainties) of the Gaia satellite data release 2 (DR2). The source are six cosmological high-resolution magneto-hydrodynamic ΛCDM zoom simu... Read More about Aurigaia: mock Gaia DR2 stellar catalogues from the Auriga cosmological simulations.

The Imprint of Cosmic Reionization on the Luminosity Function of Galaxies (2018)
Journal Article
Bose, S., Deason, A. J., & Frenk, C. S. (2018). The Imprint of Cosmic Reionization on the Luminosity Function of Galaxies. Astrophysical Journal, 863(2), Article 123. https://doi.org/10.3847/1538-4357/aacbc4

The (re)ionization of hydrogen in the early universe has a profound effect on the formation of the first galaxies: by raising the gas temperature and pressure, it prevents gas from cooling into small halos, thus affecting the abundance of present-day... Read More about The Imprint of Cosmic Reionization on the Luminosity Function of Galaxies.

Absolute Hubble Space Telescope Proper Motion (HSTPROMO) of Distant Milky Way Globular Clusters: Galactocentric Space Velocities and the Milky Way Mass (2018)
Journal Article
Sohn, S. T., Watkins, L. L., Fardal, M. A., van der Marel, R. P., Deason, A. J., Besla, G., & Bellini, A. (2018). Absolute Hubble Space Telescope Proper Motion (HSTPROMO) of Distant Milky Way Globular Clusters: Galactocentric Space Velocities and the Milky Way Mass. Astrophysical Journal, 862(1), Article 52. https://doi.org/10.3847/1538-4357/aacd0b

We present Hubble Space Telescope (HST) absolute proper motion (PM) measurements for 20 globular clusters (GCs) in the Milky Way (MW) halo at Galactocentric distances RGC » 10 100 – kpc, with a median per-coordinate PM uncertainty of 0.06 m - as yr 1... Read More about Absolute Hubble Space Telescope Proper Motion (HSTPROMO) of Distant Milky Way Globular Clusters: Galactocentric Space Velocities and the Milky Way Mass.

Apocenter Pile-up: Origin of the Stellar Halo Density Break (2018)
Journal Article
Deason, A. J., Belokurov, V., Koposov, S. E., & Lancaster, L. (2018). Apocenter Pile-up: Origin of the Stellar Halo Density Break. Astrophysical Journal Letters, 862(1), Article L1. https://doi.org/10.3847/2041-8213/aad0ee

We measure the orbital properties of halo stars using seven-dimensional information provided by Gaia and the Sloan Digital Sky Survey. A metal-rich population of stars, present in both local main sequence stars and more distant blue horizontal branch... Read More about Apocenter Pile-up: Origin of the Stellar Halo Density Break.

Evolution of LMC/M33-mass dwarf galaxies in the EAGLE simulation (2018)
Journal Article
Shao, S., Cautun, M., Deason, A., Frenk, C., & Theuns, T. (2018). Evolution of LMC/M33-mass dwarf galaxies in the EAGLE simulation. Monthly Notices of the Royal Astronomical Society, 479(1), 284-296. https://doi.org/10.1093/mnras/sty1470

We investigate the population of dwarf galaxies with stellar masses similar to the Large Magellanic Cloud (LMC) and M33 in the EAGLE galaxy formation simulation. In the field, galaxies reside in haloes with stellar-to-halo mass ratios of 1.03+0.50−0.... Read More about Evolution of LMC/M33-mass dwarf galaxies in the EAGLE simulation.

Co-formation of the disc and the stellar halo★ (2018)
Journal Article
Belokurov, V., Erkal, D., Evans, N., Koposov, S., & Deason, A. (2018). Co-formation of the disc and the stellar halo★. Monthly Notices of the Royal Astronomical Society, 478(1), 611-619. https://doi.org/10.1093/mnras/sty982

Using a large sample of main sequence stars with 7D measurements supplied by Gaia and SDSS, we study the kinematic properties of the local (within ∼10 kpc from the Sun) stellar halo. We demonstrate that the halo’s velocity ellipsoid evolves strongly... Read More about Co-formation of the disc and the stellar halo★.