Energy evolution in the progenitor of galaxy shells: a semi-analytical model
arXiv:2409.01403 · doi:10.3847/1538-4357/ad75f9
Abstract
The stellar shells surrounding an elliptical galaxy, as remnants of a dwarf galaxy disrupted during merging, reveal the distribution of energy and angular momentum of the progenitor dwarf galaxy. We develop a semi-analytical model to describe the changes of energy and angular momentum for particles during the first infall. We show that these changes, induced by the self-gravity of the progenitor, are important in broadening the initial energy distribution of the Plummer or Hernquist progenitor model. Consequently, these changes are crucial in shaping the shells. In the free fall stage following the disintegration of the progenitor potential, particles are no longer bound by self-gravity but move within the gravitational potential of the target galaxy. We investigate the relationship between the radial period and the energy of particles undergoing radial motion. We show that an accurate model of the energy range of the dwarf galaxy at disruption is essential to predict the number of observable shells.
arXiv comment14 pages, 5 figures, accepted for publication in ApJ
References in corpus (24)
- Cosmological Hydrodynamics with Adaptive Mesh Refinement: a new high resolution code called RAMSES
- Analytical Models For Galactic Nuclei
- The Atlas3D project -- XXIX. The new look of early-type galaxies and surrounding fields disclosed by extremely deep optical images
- Mass segregation and fractal substructure in young massive clusters: (I) the McLuster code and method calibration
- The tidal stripping of satellites
- A simple multigrid scheme for solving the Poisson equation with arbitrary domain boundaries
- The Optical and Near-Infrared Morphologies of Isolated Early Type Galaxies
- Faint Tidal Features in Galaxies within the Canada-France-Hawaii Telescope Legacy Survey Wide Fields
- Formation and Incidence of Shell Galaxies in the Illustris Simulation
- Tidal debris morphology and the orbits of satellite galaxies
- Census and classification of low-surface-brightness structures in nearby early-type galaxies from the MATLAS survey
- Spectacular Shells in the Host Galaxy of the QSO MC2 1635+119
- An analytical phase-space model for tidal caustics
- Measuring Galaxy Potentials using Shell Kinematics
- The Milky Way's Shell Structure Reveals the Time of a Radial Collision
- NGC 4993, the shell galaxy host of GW170817: constraints on the recent galactic merger
- Quadruple-peaked spectral line profiles as a tool to constrain gravitational potential of shell galaxies
- Constraining the Gravitational Potential from the Projected Morphology of Extragalactic Tidal Streams
- Deep imaging of the shell elliptical galaxy NGC3923 with MegaCam
- Shell galaxies as laboratories for testing MOND
- Particle tagging and its implications for stellar population dynamics
- Revealing the formation mechanism of the shell galaxy NGC474 with MUSE
- NGC 474 as viewed with KCWI: diagnosing a shell galaxy
- MOND implications for spectral line profiles of shell galaxies: shell formation history and mass-velocity scaling relations