Exponential Disks from Stellar Scattering: III. Stochastic Models
arXiv:1607.07595 · doi:10.3847/0004-637X/830/2/115
Abstract
Stellar scattering off irregularities in a galaxy disk has been shown to make an exponential radial profile, but no fundamental reason for this has been suggested. Here we show that exponentials are mathematically expected from random scattering in a disk when there is a slight inward bias in the scattering probability. Such a bias was present in our previous scattering experiments that formed exponential profiles. Double exponentials can arise when the bias varies with radius. This is a fundamental property of scattering and may explain why piece-wise exponential profiles are ubiquitous in galaxies, even after minor mergers and other disruptive events.
15 pages, 6 figures, accepted for Astrophysical Journal
References in corpus (14)
- Forming Disk Galaxies in Lambda CDM Simulations
- Rapid formation of exponential disks and bulges at high redshift from the dynamical evolution of clump cluster and chain galaxies
- The structure of galactic disks: Studying late-type spiral galaxies using SDSS
- Color Profiles of Spiral Galaxies: Clues on Outer-Disk Formation Scenarios
- On the Formation of Galactic Thick Disks
- Antitruncated Stellar Disks via Minor Mergers
- The effect of radial migration on galactic disks
- An N-body/SPH Study of Isolated Galaxy Mass Density Profiles
- Dissecting simulated disc galaxies I: the structure of mono-age populations
- Formation of S0 galaxies through mergers. V. Antitruncated stellar discs resulting from major mergers
- The Structure and Stellar Content of the Outer Disks of Galaxies: A New View from the Pan-STARRS1 Medium Deep Survey
- Structure and dynamics of galaxies with a low surface brightness disc. I. The stellar and ionised-gas kinematics
- How to bend galaxy disc profiles: the role of halo spin
- Smoothing Rotation Curves and Mass Profiles