Zobrazeno 1 - 10
of 1 126
pro vyhledávání: '"Niemeyer, J."'
Major mergers are considered to be a significant source of turbulence in clusters. We performed a numerical simulation of a major merger event using nested-grid initial conditions, adaptive mesh refinement, radiative cooling of primordial gas, and a
Externí odkaz:
http://arxiv.org/abs/1705.06933
Baryonic streaming motions produced prior to the epoch of recombination became supersonic during the cosmic dark ages. Various studies suggest that such streaming velocities change the halo statistics and also influence the formation of Population II
Externí odkaz:
http://arxiv.org/abs/1311.5866
Autor:
Schmidt, W., Almgren, A. S., Braun, H., Engels, J. F., Niemeyer, J. C., Schulz, J., Mekuria, R. R., Aspden, A. J., Bell, J. B.
We investigate turbulence generated by cosmological structure formation by means of large eddy simulations using adaptive mesh refinement. In contrast to the widely used implicit large eddy simulations, which resolve a limited range of length scales
Externí odkaz:
http://arxiv.org/abs/1309.3996
Black holes of a billion solar masses are observed in the infant universe a few hundred million years after the Big Bang. The direct collapse of protogalactic gas clouds in primordial halos with $\rm T_{vir} \geq 10^{4} K$ provides the most promising
Externí odkaz:
http://arxiv.org/abs/1309.1097
Population III stars forming in the infant universe at z=30 heralded the end of the cosmic dark ages. They are presumed to be assembled in so-called minihaloes with virial temperatures of a few thousand K where collapse is triggered by molecular hydr
Externí odkaz:
http://arxiv.org/abs/1306.2745
Supermassive black holes with up to a $\rm 10^{9}~M_{\odot}$ dwell in the centers of present-day galaxies, and their presence has been confirmed at z $\geq$ 6. Their formation at such early epochs is still an enigma. Different pathways have been sugg
Externí odkaz:
http://arxiv.org/abs/1304.0962
Autor:
Aharonian, F., Arshakian, T. G., Allen, B., Banerjee, R., Beck, R., Becker, W., Bomans, D. J., Breitschwerdt, D., Brüggen, M., Brunthaler, A., Catinella, B., Champion, D., Ciardi, B., Crocker, R., de Avillez, M. A., Dettmar, R. J., Engels, D., Enßlin, T., Enke, H., Fieseler, T., Gizon, L., Hackmann, E., Hartmann, B., Henkel, C., Hoeft, M., Iapichino, L., Innes, D., James, C., Jasche, J., Jones, D., Kagramanova, V., Kauffmann, G., Keane, E., Kerp, J., Klöckner, H. -R., Kokkotas, K., Kramer, M., Krause, M., Krupp, N., Kunz, J., Lämmerzahl, C., Lee, K. J., List, M., Liu, K., Lobanov, A., Mann, G., Merloni, A., Middelberg, E., Niemeyer, J., Noutsos, A., Perlick, V., Reich, W., Richter, P., Roy, A., Saintonge, A., Schäfer, G., Schaffner-Bielich, J., Schinnerer, E., Schleicher, D., Schneider, P., Schwarz, D. J., Sedrakian, A., Sesana, A., Smolčić, V., Solanki, S., Tuffs, R., Vetter, M., Weber, E., Weller, J., Wex, N., Wucknitz, O., Zwaan, M.
The Square Kilometre Array (SKA) is the most ambitious radio telescope ever planned. With a collecting area of about a square kilometre, the SKA will be far superior in sensitivity and observing speed to all current radio facilities. The scientific c
Externí odkaz:
http://arxiv.org/abs/1301.4124
While present standard model of cosmology yields no clear prediction for the initial magnetic field strength, efficient dynamo action may compensate for initially weak seed fields via rapid amplification. In particular, the small-scale dynamo is expe
Externí odkaz:
http://arxiv.org/abs/1212.1619
Atomic cooling haloes with virial temperatures $\rm T_{vir} \geq 10^{4}$ K are the most plausible sites for the formation of the first galaxies and the first intermediate mass black holes. It is therefore important to assess whether one can obtain ro
Externí odkaz:
http://arxiv.org/abs/1210.1802
Publikováno v:
ASP Conf. Proc. 453 (2012) 151
FEARLESS (Fluid mEchanics with Adaptively Refined Large Eddy SimulationS) is a numerical scheme for modelling subgrid-scale turbulence in cosmological adaptive mesh refinement simulations. In this contribution, the main features of this tool will be
Externí odkaz:
http://arxiv.org/abs/1109.2042