Gravitational potential energy of interpenetrating spherical galaxies in Hernquist’s model

Narasimhan, K.; Sastry, K. S.; Alladin, S. M.

doi:10.1007/bf02714851

Cited by 2 publications

(1 citation statement)

References 14 publications

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“…To get a physical insight into the deformities, galactic encounters -distant, grazing, overlapping, off-centre and head-on between sphere-sphere, disk-disk and disk-sphere pairshave been extensively studied by a number of workers during the last three decades. Some of them made estimates of the tidal damage in a galactic collision analytically using the impulsive approximation (Spitzer, 1958;Toomre, 1977;Alladin and Parthasarathy, 1978;Narasimhan and Alladin, 1986;Namboodiri, 1995;Narasimhan et al, 1997). Numerical or semi-analytical studies of colliding galaxies were carried out by Alladin (1965), Zafarullah and Sastry (1987) and Chatterjee and Magalinsky (2001).…”

Section: Introductionmentioning

confidence: 99%

Head-on Collision of Disk–Sphere Galaxies

Namboodiri

Sastry

Narasimhan

2006

Astrophys Space Sci

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Numerical simulations are performed to study the tidal effects of non-merging rapid head-on collision between a disk galaxy and a spherical galaxy. The disk consists of three components -a disk, a bulge and a halo -and the spherical galaxy is a Plummer model. The galaxies have the same dimensions with different mass ratios viz., 2, 1 and 0.5. They move in a rectilinear orbit with a relative velocity of 1000 km s −1 .None of the simulations leads to the merger of the galaxies by tidal capture. The results of our simulations indicate that although tidal effects are sensitive to both the mass ratio and the inclination of the disk to the orbital plane, it is the mass ratio which is more important in producing tidal damage to the less massive galaxy. The spherical galaxy undergoes considerable tidal effects if the mass of the disk is same or larger. On the other hand the collisions in which the mass of the spherical galaxy is more, result in the formation of a ring structure after the closest approach and the structure disappears by the end of the simulations.

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Section: Introductionmentioning

confidence: 99%

Head-on Collision of Disk–Sphere Galaxies

Namboodiri

Sastry

Narasimhan

2006

Astrophys Space Sci

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Beyond Coulomb’s Law: The Interaction Between Overlapping Charged Balls

Ivchenko

2023

The Phys. Educat.

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We give a detailed analysis of the interaction between overlapping charged balls, depending on the distance between them and their sizes. If one of the balls is entirely inside another ball, the interaction force is strictly proportional to the distance between the balls’ centers. This force has a maximum when some partial balls overlap depending on the ratio of their radii. For example, if the balls are the same, then the maximum corresponds to the distance between the centers equal to the balls’ radius. At small relative displacements of oppositely charged balls, they should perform harmonic oscillations around their common center of mass. The paper is addressed to undergraduates who deal with modern electrostatics.

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Gravitational potential energy of interpenetrating spherical galaxies in Hernquist’s model

Cited by 2 publications

References 14 publications

Head-on Collision of Disk–Sphere Galaxies

Head-on Collision of Disk–Sphere Galaxies

Beyond Coulomb’s Law: The Interaction Between Overlapping Charged Balls

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