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Dr Vincent Eke's Outputs (84)

Knowing the unknowns: uncertainties in simple estimators of galactic dynamical masses (2017)
Journal Article
Campbell, D. J., Frenk, C. S., Jenkins, A., Eke, V. R., Navarro, J. F., Sawala, T., …Theuns, T. (2017). Knowing the unknowns: uncertainties in simple estimators of galactic dynamical masses. Monthly Notices of the Royal Astronomical Society, 469(2), 2335-2360. https://doi.org/10.1093/mnras/stx975

The observed stellar kinematics of dispersion-supported galaxies are often used to measure dynamical masses. Recently, several analytical relationships between the stellar line-of-sight velocity dispersion, the projected (2D) or deprojected (3D) half... Read More about Knowing the unknowns: uncertainties in simple estimators of galactic dynamical masses.

Cosmic particle colliders: simulations of self-interacting dark matter with anisotropic scattering (2017)
Journal Article
Robertson, A., Massey, R., & Eke, V. (2017). Cosmic particle colliders: simulations of self-interacting dark matter with anisotropic scattering. Monthly Notices of the Royal Astronomical Society, 467(4), 4719-4730. https://doi.org/10.1093/mnras/stx463

We investigate how self-interacting dark matter (SIDM) with anisotropic scattering affects the evolution of isolated dark matter haloes as well as systems with two colliding haloes. For isolated haloes, we find that the evolution can be adequately ca... Read More about Cosmic particle colliders: simulations of self-interacting dark matter with anisotropic scattering.

How thick are Mercury's polar water ice deposits? (2016)
Journal Article
Eke, V. R., Lawrence, D. J., & Teodoro, L. F. (2017). How thick are Mercury's polar water ice deposits?. Icarus, 284, 407-415. https://doi.org/10.1016/j.icarus.2016.12.001

An estimate is made of the thickness of the radar-bright deposits in craters near to Mercury’s north pole. To construct an objective set of craters for this measurement, an automated crater finding algorithm is developed and applied to a digital elev... Read More about How thick are Mercury's polar water ice deposits?.

What does the Bullet Cluster tell us about self-interacting dark matter? (2016)
Journal Article
Robertson, A., Massey, R., & Eke, V. (2017). What does the Bullet Cluster tell us about self-interacting dark matter?. Monthly Notices of the Royal Astronomical Society, 465(1), 569-587. https://doi.org/10.1093/mnras/stw2670

We perform numerical simulations of the merging galaxy cluster 1E 0657−56 (the Bullet Cluster), including the effects of elastic dark matter scattering. In a similar manner to the stripping of gas by ram pressure, dark matter self-interactions would... Read More about What does the Bullet Cluster tell us about self-interacting dark matter?.

Self-interacting dark matter scattering rates through cosmic time (2015)
Journal Article
Robertson, A., Massey, R., Eke, V., & Bower, R. (2015). Self-interacting dark matter scattering rates through cosmic time. Monthly Notices of the Royal Astronomical Society, 453(3), 2267-2276. https://doi.org/10.1093/mnras/stv1805

We estimate the rate of dark matter scattering in collapsed structures throughout the history of the Universe. If the scattering cross-section is velocity independent, then the canonical picture is correct that scatterings occur mainly at late times.... Read More about Self-interacting dark matter scattering rates through cosmic time.

The offsets between galaxies and their dark matter in Λ cold dark matter (2015)
Journal Article
Schaller, M., Robertson, A., Massey, R., Bower, R. G., & Eke, V. R. (2015). The offsets between galaxies and their dark matter in Λ cold dark matter. Monthly Notices of the Royal Astronomical Society: Letters, 453(1), L58-L62. https://doi.org/10.1093/mnrasl/slv104

We use the ‘Evolution and Assembly of GaLaxies and their Environments’ (EAGLE) suite of hydrodynamical cosmological simulations to measure offsets between the centres of stellar and dark matter components of galaxies. We find that the vast majority (... Read More about The offsets between galaxies and their dark matter in Λ cold dark matter.

The effect of craters on the lunar neutron flux (2015)
Journal Article
Eke, V., Bower, K., Diserens, S., Ryder, M., Yeomans, P., Teodoro, L., …Lawrence, D. (2015). The effect of craters on the lunar neutron flux. Journal of Geophysical Research: Planets, 120(8), 1377-1395. https://doi.org/10.1002/2015je004856

The variation of remotely sensed neutron count rates is measured as a function of cratercentric distance using data from the Lunar Prospector Neutron Spectrometer. The count rate, stacked over many craters, peaks over the crater center, has a minimum... Read More about The effect of craters on the lunar neutron flux.

Evidence for explosive silicic volcanism on the Moon from the extended distribution of thorium near the Compton-Belkovich Volcanic Complex (2014)
Journal Article
Wilson, J., Eke, V., Massey, R., Elphic, R., Jolliff, B., Lawrence, D., …Teodoro, L. (2015). Evidence for explosive silicic volcanism on the Moon from the extended distribution of thorium near the Compton-Belkovich Volcanic Complex. Journal of Geophysical Research: Planets, 120(1), 92-108. https://doi.org/10.1002/2014je004719

We reconstruct the abundance of thorium near the Compton-Belkovich Volcanic Complex on the Moon, using data from the Lunar Prospector Gamma Ray Spectrometer. We enhance the resolution via a pixon image reconstruction technique and find that the thori... Read More about Evidence for explosive silicic volcanism on the Moon from the extended distribution of thorium near the Compton-Belkovich Volcanic Complex.

Galaxy And Mass Assembly (GAMA): the halo mass of galaxy groups from maximum-likelihood weak lensing (2014)
Journal Article
Han, J., Eke, V., Frenk, C., Mandelbaum, R., Norberg, P., Schneider, M., …Robotham, A. (2015). Galaxy And Mass Assembly (GAMA): the halo mass of galaxy groups from maximum-likelihood weak lensing. Monthly Notices of the Royal Astronomical Society, 446(2), 1356-1379. https://doi.org/10.1093/mnras/stu2178

We present a maximum-likelihood weak-lensing analysis of the mass distribution in optically selected spectroscopic Galaxy Groups (G3Cv5) in the Galaxy And Mass Assembly (GAMA) survey, using background Sloan Digital Sky Survey (SDSS) photometric galax... Read More about Galaxy And Mass Assembly (GAMA): the halo mass of galaxy groups from maximum-likelihood weak lensing.

Lunar polar craters - icy, rough or just sloping? (2014)
Journal Article
Eke, V., Bartram, S., Lane, D., Smith, D., & Teodoro, L. (2014). Lunar polar craters - icy, rough or just sloping?. Icarus, 241, 66-78. https://doi.org/10.1016/j.icarus.2014.06.021

Circular Polarisation Ratio (CPR) mosaics from Mini-SAR on Chandrayaan-1 and Mini-RF on LRO are used to study craters near to the lunar north pole. The look direction of the detectors strongly affects the appearance of the crater CPR maps. Rectifying... Read More about Lunar polar craters - icy, rough or just sloping?.

The properties of warm dark matter haloes (2014)
Journal Article
Lovell, M. R., Frenk, C. S., Eke, V. R., Jenkins, A., Gao, L., & Theuns, T. (2014). The properties of warm dark matter haloes. Monthly Notices of the Royal Astronomical Society, 439(1), 300-317. https://doi.org/10.1093/mnras/stt2431

Well-motivated elementary particle candidates for the dark matter, such as the sterile neutrino, behave as warm dark matter (WDM). For particle masses of the order of a keV, free streaming produces a cutoff in the linear fluctuation power spectrum at... Read More about The properties of warm dark matter haloes.

How well do we know the polar hydrogen distribution on the Moon? (2013)
Journal Article
Teodoro, L., Eke, V., Elphic, R., Feldman, W., & Lawrence, D. (2014). How well do we know the polar hydrogen distribution on the Moon?. Journal of Geophysical Research: Planets, 119(3), 574-593. https://doi.org/10.1002/2013je004421

A detailed comparison is made of results from the Lunar Prospector Neutron Spectrometer (LPNS) and the Lunar Exploration Neutron Detector Collimated Sensors for Epithermal Neutrons (LEND CSETN). Using the autocorrelation function and power spectrum o... Read More about How well do we know the polar hydrogen distribution on the Moon?.

Spatial and luminosity distributions of galactic satellites (2013)
Journal Article
Guo, Q., Cole, S., Eke, V., Frenk, C., & Helly, J. (2013). Spatial and luminosity distributions of galactic satellites. Monthly Notices of the Royal Astronomical Society, 434(3), 1838-1848. https://doi.org/10.1093/mnras/stt903

We investigate the luminosity functions and projected number density profiles of galactic satellites around isolated primaries of different luminosity. We measure these quantities for model satellites placed into the Millennium and Millennium II dark... Read More about Spatial and luminosity distributions of galactic satellites.

Constraining extended gamma-ray emission from galaxy clusters (2012)
Journal Article
Han, J., Frenk, C., Eke, V., Gao, L., White, S., Boyarsky, A., …Ruchayskiy, O. (2012). Constraining extended gamma-ray emission from galaxy clusters. Monthly Notices of the Royal Astronomical Society, 427(2), 1651-1665. https://doi.org/10.1111/j.1365-2966.2012.22080.x

Cold dark matter models predict the existence of a large number of substructures within dark matter haloes. If the cold dark matter consists of weakly interacting massive particles, their annihilation within these substructures could lead to diffuse... Read More about Constraining extended gamma-ray emission from galaxy clusters.

Satellite galaxy number density profiles in the Sloan Digital Sky Survey (2012)
Journal Article
Guo, Q., Cole, S., Eke, V., & Frenk, C. (2012). Satellite galaxy number density profiles in the Sloan Digital Sky Survey. Monthly Notices of the Royal Astronomical Society, 427(1), 428-441. https://doi.org/10.1111/j.1365-2966.2012.21882.x

We study the spatial distribution of satellite galaxies around isolated primaries using the Sloan Digital Sky Survey (SDSS) spectroscopic and photometric galaxy catalogues. We select isolated primaries from the spectroscopic sample and search for pot... Read More about Satellite galaxy number density profiles in the Sloan Digital Sky Survey.

The haloes of bright satellite galaxies in a warm dark matter universe (2012)
Journal Article
Lovell, M., Eke, V., Frenk, C., Gao, L., Jenkins, A., Theuns, T., …Ruchayskiy, O. (2012). The haloes of bright satellite galaxies in a warm dark matter universe. Monthly Notices of the Royal Astronomical Society, 420(3), 2318-2324. https://doi.org/10.1111/j.1365-2966.2011.20200.x

High-resolution N-body simulations of galactic cold dark matter haloes indicate that we should expect to find a few satellite galaxies around the Milky Way whose haloes have a maximum circular velocity in excess of 40 km s−1. Yet, with the exception... Read More about The haloes of bright satellite galaxies in a warm dark matter universe.

The baryons in the Milky Way satellites (2012)
Journal Article
Parry, O., Eke, V., Frenk, C., & Okamoto, T. (2012). The baryons in the Milky Way satellites. Monthly Notices of the Royal Astronomical Society, 419(4), 3304-3318. https://doi.org/10.1111/j.1365-2966.2011.19971.x

We investigate the formation and evolution of satellite galaxies using smoothed particle hydrodynamics (SPH) simulations of a Milky Way (MW) like system, focusing on the best resolved examples, analogous to the classical MW satellites. Comparing with... Read More about The baryons in the Milky Way satellites.