Zobrazeno 1 - 10
of 341
pro vyhledávání: '"Velazquez, H"'
Publikováno v:
A&A 668, A20 (2022)
A variety of new physical processes have proven to play an important role in orbital decay of a satellite galaxy embedded inside a dark matter halo but this is not fully understood. Our goal is to assess if the orbital history of a satellite remains
Externí odkaz:
http://arxiv.org/abs/2210.00702
The large dynamic range in some astrophysical N-body problems led to the use of adaptive multi-time-steps; however, the search for optimal strategies is still challenging. We numerically quantify the performance of the hierarchical Hamiltonian Splitt
Externí odkaz:
http://arxiv.org/abs/2009.06133
Autor:
Devi, N. Chandrachani, Jaber-Bravo, M., Aguilar-Argüello, G., Valenzuela, O., de la Macorra, A., Velázquez, H.
We study the nonlinear regime of large scale structure formation considering a dynamical dark energy (DE) component determined by a Steep Equation of State parametrization (SEoS) $w(z)=w_0+w_i\frac{(z/z_T)^q}{1+(z/z_T)^q}$. In order to perform the mo
Externí odkaz:
http://arxiv.org/abs/1911.02402
In this paper we present a dynamical system to generate Brownian motion based on the Langevin equation without stochastic term and using fractional derivatives, i.e., a deterministic Brownian motion model is proposed. The stochastic process is replac
Externí odkaz:
http://arxiv.org/abs/1802.04382
Publikováno v:
International Journal of Bifurcation and Chaos, Vol. 27, No. 09, 1730031 (2017)
A multistable system generated by a Piecewise Linear (PWL) system based on the jerky equation is presented. The systems behaviour is characterised by means of the Nearest Integer or round(x) function to control the switching events and to locate the
Externí odkaz:
http://arxiv.org/abs/1611.03461
We present a dynamical study of the effect of the bar and spiral arms on the simulated orbits of open clusters in the Galaxy. Specifically, this work is devoted to the puzzling presence of high-altitude open clusters in the Galaxy. For this purpose w
Externí odkaz:
http://arxiv.org/abs/1601.02612
Autor:
Avila-Reese, V., Colín, P., González-Samaniego, A., Valenzuela, O., Firmani, C., Velázquez, H., Ceverino, D.
Publikováno v:
ApJ, 736, 134 (2011)
(Abridged) By means of high-resolution cosmological simulations in the context of the LCDM scenario, the specific star formation rate (SSFR=SFR/Ms, Ms is the stellar mass)--Ms and stellar mass fraction (Fs=Ms/Mh, Mh is the halo mass)--Ms relations of
Externí odkaz:
http://arxiv.org/abs/1103.4422
Publikováno v:
Astrophys.J.698:2023-2030,2009
We determine both representations of the Fundamental Plane [Re Sig^a Ie^b and Re (Sig^2/Ie)^lambda] and the luminosity-effective phase space density [L fe^(-gamma)] scaling relation for N-body remnants of binary mergers of spiral-like galaxies. The m
Externí odkaz:
http://arxiv.org/abs/0905.2475
Publikováno v:
Mon.Not.Roy.Astron.Soc.373:632-642,2006
Sersic parameters characterising the density profiles of remnants formed in collision-less disc galaxy mergers are obtained; no bulge is included in our simulations. For the luminous component we find that the Sersic index is n ~ (1.5,5.3) with ~
Externí odkaz:
http://arxiv.org/abs/astro-ph/0601412
Autor:
Aceves, H., Velazquez, H.
We present scaling relations between the virial velocity (V) and the one-dimensional central velocity dispersion (Sig0); the gravitational radius (Rv) and the effective radius (Re); and the total mass (M) and the luminous mass (ML) found in N-body si
Externí odkaz:
http://arxiv.org/abs/astro-ph/0509184