Zobrazeno 1 - 10
of 1 462
pro vyhledávání: '"Bertín, G."'
Autor:
Khoperskov, S. A., Bertin, G.
Publikováno v:
J. Plasma Phys. 81 (2015) 495810607
By means of 3D hydrodynamical simulations, in a separate paper we have discussed the properties of non-axisymmetric density wave trains in the outermost regions of galaxy disks, based on the picture that self-excited global spiral modes in the bright
Externí odkaz:
http://arxiv.org/abs/1511.06299
Autor:
Khoperskov, S. A., Bertin, G.
Deep HI observations of the outer parts of disc galaxies demonstrate the frequent presence of extended, well-developed spiral arms far beyond the optical radius. To understand the nature and the origin of such outer spiral structure, we investigate t
Externí odkaz:
http://arxiv.org/abs/1505.04598
Internal rotation is considered to play a major role in the dynamics of some globular clusters. However, in only few cases it has been studied by quantitative application of realistic and physically justified global models. Here we present a dynamica
Externí odkaz:
http://arxiv.org/abs/1305.6025
Autor:
Di Cecco, A., Zocchi, A., Varri, A. L., Monelli, M., Bertin, G., Bono, G., Stetson, P. B., Nonino, M., Buonanno, R., Ferraro, I., Iannicola, G., Kunder, A., Walker, A. R.
We present new number density and surface brightness profiles for the globular cluster M92 (NGC 6341). These profiles are calculated from optical images collected with the CCD mosaic camera MegaCam at the Canada-France-Hawaii-Telescope and with the A
Externí odkaz:
http://arxiv.org/abs/1302.1714
Autor:
Sormani, M. C., Bertin, G.
A re-investigation of the gravothermal catastrophe is presented. By means of a linear perturbation analysis, we study the dynamical stability of a spherical self-gravitating isothermal fluid of finite volume and find that the conditions for the onset
Externí odkaz:
http://arxiv.org/abs/1301.6038
Autor:
Varri, A. L., Bertin, G.
Two new families of self-consistent axisymmetric truncated equilibrium models for the description of quasi-relaxed rotating stellar systems are presented. The first extends the spherical King models to the case of solid-body rotation. The second is c
Externí odkaz:
http://arxiv.org/abs/1201.1899
We perform a systematic combined photometric and kinematic analysis of a sample of globular clusters under different relaxation conditions, based on their core relaxation time (as listed in available catalogs), by means of two well-known families of
Externí odkaz:
http://arxiv.org/abs/1201.1466
Autor:
Amorisco, N. C., Bertin, G.
Disk-halo decompositions of galaxy rotation curves are generally performed in a parametric way. We construct self-consistent models of nonspherical isothermal halos embedding a zero-thickness disk, by assuming that the halo distribution function is a
Externí odkaz:
http://arxiv.org/abs/1005.3154
Autor:
Bertin, G., Amorisco, N. C.
Context: Several spiral galaxies, as beautifully exhibited by the case of NGC 6946, display a prominent large-scale spiral structure in their gaseous outer disk. Such structure is often thought to pose a dynamical puzzle, because grand-design spiral
Externí odkaz:
http://arxiv.org/abs/0912.3178
Autor:
Varri, A. L., Bertin, G.
Publikováno v:
Astrophys. J. 703: 1911-1922, 2009
In a previous paper, we have constructed a family of self-consistent triaxial models of quasi-relaxed stellar systems, shaped by the tidal field of the hosting galaxy, as an extension of the well-known spherical King models. For a given tidal field,
Externí odkaz:
http://arxiv.org/abs/0908.2388