Zobrazeno 1 - 10
of 325
pro vyhledávání: '"Thacker, R."'
Autor:
Snaith, O. N., Gibson, B. K., Brook, C. B., Knebe, A., Thacker, R. J., Quinn, T. R., Governato, F., Tissera, P. B.
We examine the properties and evolution of a simulated polar disc galaxy. This galaxy is comprised of two orthogonal discs, one of which contains old stars (old stellar disc), and the other, containing both younger stars and the cold gas (polar disc)
Externí odkaz:
http://arxiv.org/abs/1206.5570
Autor:
Pilkington, K., Gibson, B. K., Brook, C. B., Calura, F., Stinson, G. S., Thacker, R. J., Michel-Dansac, L., Bailin, J., Couchman, H. M. P., Wadsley, J., Quinn, T. R., Maccio, A.
We examine the chemical properties of 5 cosmological hydrodynamical simulations of an M33-like disc galaxy which have been shown to be consistent with the morphological characteristics and bulk scaling relations expected of late-type spirals. These s
Externí odkaz:
http://arxiv.org/abs/1205.4796
Autor:
Pilkington, K., Few, C. G., Gibson, B. K., Calura, F., Michel-Dansac, L., Thacker, R. J., Molla, M., Matteucci, F., Rahimi, A., Kawata, D., Kobayashi, C., Brook, C. B., Stinson, G. S., Couchman, H. M. P., Bailin, J., Wadsley, J.
We examine radial and vertical metallicity gradients using a suite of disk galaxy simulations, supplemented with two classic chemical evolution approaches. We determine the rate of change of gradient and reconcile differences between extant models an
Externí odkaz:
http://arxiv.org/abs/1201.6359
Autor:
Pilkington, K., Gibson, B. K., Calura, F., Brooks, A. M., Mayer, L., Brook, C. B., Stinson, G. S., Thacker, R. J., Few, C. G., Cunnama, D., Wadsley, J.
We present an analysis of the neutral hydrogen (HI) properties of a fully cosmological hydrodynamical dwarf galaxy, run with varying simulation parameters. As reported by Governato et al. (2010), the high resolution, high star formation density thres
Externí odkaz:
http://arxiv.org/abs/1107.2922
We estimate the impact of weak lensing by strongly nonlinear cosmological structures on the cosmic microwave background. Accurate calculation of large $\ell$ multipoles requires N-body simulations and ray-tracing schemes with both high spatial and te
Externí odkaz:
http://arxiv.org/abs/1001.4991
Publikováno v:
Phys.Rev.D80:123513,2009
Recently, ATIC and PAMELA measured an anomalously large flux of leptonic cosmic rays which may arise from dark matter self-annihilation. While the annihilation signal predicted for a smooth halo is 10^2-10^3 times smaller than the measured excess, th
Externí odkaz:
http://arxiv.org/abs/0906.4352
We explore the dependence of the subhalo mass function on the spectral index n of the linear matter power spectrum using scale-free Einstein-de Sitter simulations with n=-1 and n=-2.5. We carefully consider finite volume effects that may call into qu
Externí odkaz:
http://arxiv.org/abs/0811.0206
Autor:
Thacker, R. J., Couchman, H. M. P.
Higher order cumulants of point processes, such as skew and kurtosis, require significant computational effort to calculate. The traditional counts-in-cells method implicitly requires a large amount of computation since, for each sampling sphere, a c
Externí odkaz:
http://arxiv.org/abs/astro-ph/0512040
Autor:
Thacker, R. J., Couchman, H. M. P.
We discuss the design and implementation of HYDRA_OMP a parallel implementation of the Smoothed Particle Hydrodynamics-Adaptive P3M (SPH-AP3M) code HYDRA. The code is designed primarily for conducting cosmological hydrodynamic simulations and is writ
Externí odkaz:
http://arxiv.org/abs/astro-ph/0512030
Autor:
Scannapieco, E., Pichon, C., Aracil, B., Petitjean, P., Thacker, R. J., Pogosyan, D., Bergeron, J., Couchman, H. M. P.
Publikováno v:
Mon.Not.Roy.Astron.Soc. 365 (2006) 615-637; Erratum-ibid. 366 (2006) 1118
We study the clustering properties of metals in the intergalactic medium (IGM) as traced by 619 CIV, 81 SiIV, N >= 10^12 cm^-2 and 316 MgII, and 82 FeII N >= 10^11.5 cm^-2 absorption components in 19 high signal-to-noise (60-100 per pixel), high reso
Externí odkaz:
http://arxiv.org/abs/astro-ph/0503001