Orbital scattering by random interactions with extended substructures

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Abstract

This paper presents N-body and stochastic models that describe the motion of tracer particles in a potential that contains a large population of extended substructures. Fluctuations of the gravitational field induce a random walk of orbital velocities that is fully specified by drift and diffusion coefficients. In the impulse and local approximations the coefficients are computed analytically from the number density, mass, size and relative velocity of substructures without arbitrary cuts in forces or impact parameters. The resulting Coulomb logarithm attains a well-defined geometrical meaning, ln (Λ) = ln (D/c), where D/c is the ratio between the average separation and the individual size of substructures. Direct-force and Monte-Carlo N-body experiments show excellent agreement with the theory if substructures are sufficiently extended (c/D ≳ 10−3) and not spatially overlapping (c/D ≲ 10−1). However, close encounters with point-like objects (c/D ≪ 10−3) induce a heavy-tailed, non-Gaussian distribution of high-energy impulses that cannot be described with Brownian statistics. In the point-mass limit (c/D ≈ 0) the median Coulomb logarithm measured from N-body models deviates from the theoretical relation, converging towards a maximum value 〈ln (Λ)〉 ≈ 8.2 independently of the mass and relative velocity of nearby substructures.
Original languageEnglish
Number of pages11
JournalMonthly Notices of the Royal Astronomical Society
DOIs
Publication statusPublished - 7 Oct 2019

Keywords

  • astro-ph.GA

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