منابع مشابه
Random packing of elliptical disks
The dense packing of hard objects is a recurrent paradigm in physics, for example in early models of crystallinity, and also in theories of granular materials which are under active debate today [1, 2]. Generally speaking the objects are taken to be spheres, leading to the formulation of the Kepler Problem (what is their closest packing?) and the investigations begun by Bernal on disordered pac...
متن کاملLarge stellar disks in small elliptical galaxies
We present the rotation velocities V and velocity dispersions σ along the principal axes of seven elliptical galaxies less luminous than MB = −19.5. These kinematics extend beyond the half-light radii for all systems in this photometrically selected sample. At large radii the kinematics not only confirm that rotation and “diskiness” are important in faint ellipticals, as was previously known, b...
متن کاملThe Formation of Disks in Elliptical Galaxies
We investigate detailed kinematical properties of simulated collisionless merger remnants of disk galaxies with mass ratios of 1:1 and 3:1. The simulations were performed by direct summation using the new special hardware device GRAPE-5. In agreement with observations, the shape of the line-of-sight velocity distribution (LOSVD) is Gaussian with small deviations. For most cases we find that the...
متن کاملGravitational Stability of Circumnuclear Disks in Elliptical Galaxies
A significant fraction of nearby elliptical galaxies are known to have high-density gas disks in their circumnuclear (CN) region (0.1 to a few kpc). Yet, ellipticals, especially luminous ones, show little signs of recent star formation. To investigate the possible cause of the dearth of star formation in these systems, we study the gravitational stability of CN gas disks embedded within the gra...
متن کاملSelfconsistent Approximations in Mori’s Theory
The constitutive quantities in Mori’s theory, the residual forces, are expanded in terms of time dependent correlation functions and products of operators at t = 0, where it is assumed that the time derivatives of the observables are given by products of them. As a first consequence the Heisenberg dynamics of the observables are obtained as an expansion of the same type. The dynamic equations f...
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ژورنال
عنوان ژورنال: Symposium - International Astronomical Union
سال: 1987
ISSN: 0074-1809
DOI: 10.1017/s0074180900185894