All Outputs (18)

The impact and response of mini-haloes and the interhalo medium on cosmic reionization (2024)
Journal Article
Chan, T. K., Benítez-Llambay, A., Theuns, T., Frenk, C., & Bower, R. (2024). The impact and response of mini-haloes and the interhalo medium on cosmic reionization. Monthly Notices of the Royal Astronomical Society, 528(2), 1296-1326. https://doi.org/10.1093/mnras/stae114

An ionization front (I-front) that propagates through an inhomogeneous medium is slowed down by self-shielding and recombination's. We perform cosmological radiation hydrodynamics simulations of the I-front propagation during the epoch of cosmic reio... Read More about The impact and response of mini-haloes and the interhalo medium on cosmic reionization.

The diversity of rotation curves of simulated galaxies with cusps and cores (2023)
Journal Article
Roper, F. A., Oman, K. A., Frenk, C. S., Benítez-Llambay, A., Navarro, J. F., & Santos-Santos, I. M. E. (2023). The diversity of rotation curves of simulated galaxies with cusps and cores. Monthly Notices of the Royal Astronomical Society, 521(1), 1316-1336. https://doi.org/10.1093/mnras/stad549

We use ΛCDM cosmological hydrodynamical simulations to explore the kinematics of gaseous discs in late-type dwarf galaxies. We create high-resolution 21-cm ’observations’ of simulated dwarfs produced in two variations of the EAGLE galaxy formation mo... Read More about The diversity of rotation curves of simulated galaxies with cusps and cores.

The detailed structure and the onset of galaxy formation in low-mass gaseous dark matter haloes (2020)
Journal Article
Benitez-Llambay, A., & Frenk, C. (2020). The detailed structure and the onset of galaxy formation in low-mass gaseous dark matter haloes. Monthly Notices of the Royal Astronomical Society, 498(4), 4887-4900. https://doi.org/10.1093/mnras/staa2698

We present a model for the formation of the first galaxies before and after the reionization of hydrogen in the early universe. In this model, galaxy formation can only take place in dark matter haloes whose mass exceeds a redshift-dependent critical... Read More about The detailed structure and the onset of galaxy formation in low-mass gaseous dark matter haloes.

To β or not to β: can higher-order Jeans analysis break the mass–anisotropy degeneracy in simulated dwarfs? (2020)
Journal Article
Genina, A., Read, J., Frenk, C., Cole, S., Benítez-Llambay, A., Ludlow, A., …Robertson, A. (2020). To β or not to β: can higher-order Jeans analysis break the mass–anisotropy degeneracy in simulated dwarfs?. Monthly Notices of the Royal Astronomical Society, 498(1), 144-163. https://doi.org/10.1093/mnras/staa2352

We test a non-parametric higher-order Jeans analysis method, GRAVSPHERE, on 32 simulated dwarf galaxies comparable to classical Local Group dwarfs like Fornax. The galaxies are selected from the APOSTLE suite of cosmological hydrodynamics simulations... Read More about To β or not to β: can higher-order Jeans analysis break the mass–anisotropy degeneracy in simulated dwarfs?.

Baryonic clues to the puzzling diversity of dwarf galaxy rotation curves (2020)
Journal Article
Santos-Santos, I. M., Navarro, J. F., Robertson, A., Benítez-Llambay, A., Oman, K. A., Lovell, M. R., …Ritz, A. (2020). Baryonic clues to the puzzling diversity of dwarf galaxy rotation curves. Monthly Notices of the Royal Astronomical Society, 495(1), 58-77. https://doi.org/10.1093/mnras/staa1072

We use a compilation of disc galaxy rotation curves to assess the role of the luminous component (‘baryons’) in the rotation curve diversity problem. As in earlier work, we find that rotation curve shape correlates with baryonic surface density: high... Read More about Baryonic clues to the puzzling diversity of dwarf galaxy rotation curves.

The Milky Way total mass profile as inferred from Gaia DR2 (2020)
Journal Article
Cautun, M., Benítez-Llambay, A., Deason, A. J., Frenk, C. S., Fattahi, A., Gómez, F. A., …Simpson, C. M. (2020). The Milky Way total mass profile as inferred from Gaia DR2. Monthly Notices of the Royal Astronomical Society, 494(3), 4291-4313. https://doi.org/10.1093/mnras/staa1017

We determine the Milky Way (MW) mass profile inferred from fitting physically motivated models to the Gaia DR2 Galactic rotation curve and other data. Using various hydrodynamical simulations of MW-mass haloes, we show that the presence of baryons in... Read More about The Milky Way total mass profile as inferred from Gaia DR2.

Cusp or core? Revisiting the globular cluster timing problem in Fornax (2019)
Journal Article
Meadows, N., Navarro, J. F., Santos-Santos, I., Benítez-Llambay, A., & Frenk, C. (2020). Cusp or core? Revisiting the globular cluster timing problem in Fornax. Monthly Notices of the Royal Astronomical Society, 491(3), 3336-3342. https://doi.org/10.1093/mnras/stz3280

We use N-body simulations to revisit the globular cluster (GC) ‘timing problem’ in the Fornax dwarf spheroidal (dSph). In agreement with earlier work, we find that, due to dynamical friction, GCs sink to the centre of dark matter haloes with a cuspy... Read More about Cusp or core? Revisiting the globular cluster timing problem in Fornax.

Baryon-induced dark matter cores in the EAGLE simulations (2019)
Journal Article
Benítez-Llambay, A., Frenk, C. S., Ludlow, A. D., & Navarro, J. F. (2019). Baryon-induced dark matter cores in the EAGLE simulations. Monthly Notices of the Royal Astronomical Society, 488(2), 2387-2404. https://doi.org/10.1093/mnras/stz1890

We examine the formation of dark matter (DM) cores in dwarf galaxies simulated with the EAGLE model of galaxy formation. As in earlier work, we find that the star formation (SF) gas density threshold (ρth) plays a critical role. At low thresholds (LT... Read More about Baryon-induced dark matter cores in the EAGLE simulations.

The distinct stellar metallicity populations of simulated Local Group dwarfs (2019)
Journal Article
Genina, A., Frenk, C. S., Benítez-Llambay, A., Cole, S., Navarro, J. F., Oman, K. A., & Fattahi, A. (2019). The distinct stellar metallicity populations of simulated Local Group dwarfs. Monthly Notices of the Royal Astronomical Society, 488(2), 2312-2331. https://doi.org/10.1093/mnras/stz1852

A number of Local Group dwarf galaxies are known to have two spatially segregated stellar metallicity populations, a centrally concentrated metal-rich population and a more extended metal-poor population. In this work we discuss mechanisms that lead... Read More about The distinct stellar metallicity populations of simulated Local Group dwarfs.

Fluorescent rings in star-free dark matter haloes (2019)
Journal Article
Sykes, C., Fumagalli, M., Cooke, R., Theuns, T., & Benítez–Llambay, A. (2019). Fluorescent rings in star-free dark matter haloes. Monthly Notices of the Royal Astronomical Society, 487(1), 609-621. https://doi.org/10.1093/mnras/stz1234

Photoheating of the gas in low-mass dark matter (DM) haloes prevents baryons from cooling, leaving the haloes free of stars. Gas in these ‘dark’ haloes remains exposed to the ultraviolet background (UVB), and so is expected to emit via fluorescent re... Read More about Fluorescent rings in star-free dark matter haloes.

Non-circular motions and the diversity of dwarf galaxy rotation curves (2018)
Journal Article
Oman, K. A., Marasco, A., Navarro, J. F., Frenk, C. S., Schaye, J., & Benítez-Llambay, A. (2018). Non-circular motions and the diversity of dwarf galaxy rotation curves. Monthly Notices of the Royal Astronomical Society, 482(1), 821-847. https://doi.org/10.1093/mnras/sty2687

We use mock interferometric H I measurements and a conventional tilted-ring modelling procedure to estimate circular velocity curves of dwarf galaxy discs from the APOSTLE suite of Λ cold dark matter cosmological hydrodynamical simulations. The model... Read More about Non-circular motions and the diversity of dwarf galaxy rotation curves.

The innate origin of radial and vertical gradients in a simulated galaxy disc (2018)
Journal Article
Navarro, J., Yozin, C., Loewen, N., Benítez-Llambay, A., Fattahi, A., Frenk, C., …Theuns, T. (2018). The innate origin of radial and vertical gradients in a simulated galaxy disc. Monthly Notices of the Royal Astronomical Society, 476(3), 3648-3660. https://doi.org/10.1093/mnras/sty497

We examine the origin of radial and vertical gradients in the age/metallicity of the stellar component of a galaxy disc formed in the APOSTLE cosmological hydrodynamical simulations. Some of these gradients resemble those in the Milky Way, where they... Read More about The innate origin of radial and vertical gradients in a simulated galaxy disc.

The core–cusp problem: a matter of perspective (2017)
Journal Article
Genina, A., Benítez-Llambay, A., Frenk, C. S., Cole, S., Fattahi, A., Navarro, J. F., …Theuns, T. (2017). The core–cusp problem: a matter of perspective. Monthly Notices of the Royal Astronomical Society, 474(1), 1398-1411. https://doi.org/10.1093/mnras/stx2855

The existence of two kinematically and chemically distinct stellar subpopulations in the Sculptor and Fornax dwarf galaxies offers the opportunity to constrain the density profile of their matter haloes by measuring the mass contained within the well... Read More about The core–cusp problem: a matter of perspective.

HBT+: an improved code for finding subhaloes and building merger trees in cosmological simulations (2017)
Journal Article
Han, J., Cole, S., Frenk, C., Benitez-Llambay, A., & Helly, J. (2018). HBT+: an improved code for finding subhaloes and building merger trees in cosmological simulations. Monthly Notices of the Royal Astronomical Society, 474(1), 604-617. https://doi.org/10.1093/mnras/stx2792

Dark matter subhalos are the remnants of (incomplete) halo mergers. Identifying them and establishing their evolutionary links in the form of merger trees is one of the most important applications of cosmological simulations. The HBT (Hierachical Bou... Read More about HBT+: an improved code for finding subhaloes and building merger trees in cosmological simulations.

The vertical structure of gaseous galaxy discs in cold dark matter haloes (2017)
Journal Article
Benítez-Llambay, A., Navarro, J. F., Frenk, C. S., & Ludlow, A. D. (2018). The vertical structure of gaseous galaxy discs in cold dark matter haloes. Monthly Notices of the Royal Astronomical Society, 473(1), 1019-1037. https://doi.org/10.1093/mnras/stx2420

We study the vertical structure of polytropic centrifugally supported gaseous discs embedded in cold dark matter (CDM) haloes. At fixed radius, R, the shape of the vertical density profile depends weakly on whether the disc is self-gravitating (SG) o... Read More about The vertical structure of gaseous galaxy discs in cold dark matter haloes.

The origin of the mass discrepancy-acceleration relation in ΛCDM (2017)
Journal Article
Navarro, J., Benítez-Llambay, A., Fattahi, A., Frenk, C., Ludlow, A., Oman, K., …Theuns, T. (2017). The origin of the mass discrepancy-acceleration relation in ΛCDM. Monthly Notices of the Royal Astronomical Society, 471(2), 1841-1848. https://doi.org/10.1093/mnras/stx1705

We examine the origin of the mass discrepancy–radial acceleration relation (MDAR) of disc galaxies. This is a tight empirical correlation between the disc centripetal acceleration and that expected from the baryonic component. The MDAR holds for most... Read More about The origin of the mass discrepancy-acceleration relation in ΛCDM.

Mass-Discrepancy Acceleration Relation: A Natural Outcome of Galaxy Formation in Cold Dark Matter Halos (2017)
Journal Article
Ludlow, A., Benítez-Llambay, A., Schaller, M., Theuns, T., Frenk, C., Bower, R., …Oman, K. (2017). Mass-Discrepancy Acceleration Relation: A Natural Outcome of Galaxy Formation in Cold Dark Matter Halos. Physical Review Letters, 118(16), Article 161103. https://doi.org/10.1103/physrevlett.118.161103

We analyze the total and baryonic acceleration profiles of a set of well-resolved galaxies identified in the eagle suite of hydrodynamic simulations. Our runs start from the same initial conditions but adopt different prescriptions for unresolved ste... Read More about Mass-Discrepancy Acceleration Relation: A Natural Outcome of Galaxy Formation in Cold Dark Matter Halos.

The properties of ‘dark’ ΛCDM haloes in the Local Group (2016)
Journal Article
Benítez-Llambay, A., Navarro, J., Frenk, C., Sawala, T., Oman, K., Fattahi, A., …Theuns, T. (2017). The properties of ‘dark’ ΛCDM haloes in the Local Group. Monthly Notices of the Royal Astronomical Society, 465(4), 3913-3926. https://doi.org/10.1093/mnras/stw2982

We examine the baryon content of low-mass Λ cold dark matter (ΛCDM) haloes (108 < M200/M⊙ < 5 × 109) using the APOSTLE cosmological hydrodynamical simulations. Most of these systems are free of stars and have a gaseous content set by the combined eff... Read More about The properties of ‘dark’ ΛCDM haloes in the Local Group.