author={Jo Bovy},
  journal={The Astrophysical Journal},
  • J. Bovy
  • Published 13 January 2014
  • Geology, Physics
  • The Astrophysical Journal
I present a new framework for modeling the dynamics of tidal streams. The framework consists of simple models for the initial action-angle distribution of tidal debris, which can be straightforwardly evolved forward in time. Taking advantage of the essentially one-dimensional nature of tidal streams, the transformation to position-velocity coordinates can be linearized and interpolated near a small number of points along the stream, thus allowing for efficient computations of a stream's… 
Generation of mock tidal streams
In this paper we discuss a method for the generation of mock tidal streams. Using an ensemble of simulations in an isochrone potential where the actions and frequencies are known, we derive an
Modelling tidal streams from galactic satellites
Astrophysical simulations are very useful for understanding the physical phenomena of the stellar systems. In this simulation, the computational cost is one of the main concern. To tackle this issue,
Dynamics of stream–subhalo interactions
We develop a formalism for modelling the impact of dark matter subhaloes on cold thin streams. Our formalism models the formation of a gap in a stream in angle-frequency space and is able to handle
Linear perturbation theory for tidal streams and the small-scale CDM power spectrum
Tidal streams in the Milky Way are sensitive probes of the population of dark-matter subhalos predicted in cold-dark-matter (CDM) simulations. We present a new calculus for computing the effect of
The evolution of streams in a time-dependent potential
We study the evolution of streams in a time-dependent spherical gravitational potential. Our goal is to establish what are the imprints of this time evolution on the properties of streams as well as
On feathers, bifurcations and shells: the dynamics of tidal streams across the mass scale
I present an organic description of the regimes of collisionless tidal streams and define the orderings between the physical quantities that shape their morphology. Three fundamental dichotomies are
Dipping our toes in the water: first models of GD-1 as a stream
We present a model for producing tidal streams from disrupting progenitors in arbitrary potentials, utilizing the idea that the majority of stars escape from the progenitor's two Lagrange points. The
Behaviour of streams in angle and frequency spaces in different potentials
We have studied the behaviour of stellar streams in the Aquarius fully cosmological N -body simulations of the formation of Milky Way haloes. In particular, we have characterised the streams in angle
Dynamical Properties of Collisionless Star Streams
A sufficiently extended satellite in the tidal field of a host galaxy loses mass to create nearly symmetric leading and trailing tidal streams. We study the case in which tidal heating drives mass
Chaotic dispersal of tidal debris
Several long, dynamically cold stellar streams have been observed around the Milky Way Galaxy, presumably formed from the tidal disruption of globular clusters. In integrable potentials---where all


The mechanics of tidal streams
We present an analysis of the mechanics of thin streams, which are formed following the tidal disruption of cold, low-mass clusters in the potential of a massive host galaxy. The analysis makes
Fitting orbits to tidal streams
Recent years have seen the discovery of many tidal streams through the Galaxy. Relatively straightforward observations of a stream allow one to deduce three phase-space coordinates of an orbit. An
Using gaps in N-body tidal streams to probe missing satellites
We use N-body simulations to model the tidal disruption of a star cluster in a Milky-Way-sized dark matter halo, which results in a narrow stream comparable to (but slightly wider than) Pal-5 or
Tidal Streams as Probes of the Galactic Potential
We explore the use of tidal streams from Galactic satellites for recovering the potential of the Milky Way. Our study is motivated both by the discovery of the first lengthy stellar stream in the
Stream–orbit misalignment – II. A new algorithm to constrain the Galactic potential
In the first of these two papers we demonstrated that assuming streams delineate orbits can lead to order one errors in potential parameters for realistic Galactic potentials. Motivated by the need
Stellar Streams as Probes of Dark Halo Mass and Morphology: A Bayesian Reconstruction
Tidal streams provide a powerful tool by means of which the matter distribution of the dark matter haloes of their host galaxies can be studied. However, the analysis is not straightforward because
Probabilistic model for constraining the Galactic potential using tidal streams
A generative probabilistic model for a tidal stream is presented and how this model is used to constrain the Galactic potential is demonstrated, and several modifications are described that promise to make the technique computationally tractable.
Stream–orbit misalignment – I. The dangers of orbit-fitting
Tidal streams don't, in general, delineate orbits. A stream-orbit misalignment is expected to lead to biases when using orbit-fitting to constrain models for the Galactic potential. In this first of
Building up the stellar halo of the Galaxy
We study numerical simulations of satellite galaxy disruption in a potential resembling that of the Milky Way. Our goal is to assess whether a merger origin for the stellar halo would leave
A Statistical Method for Measuring the Galactic Potential and Testing Gravity with Cold Tidal Streams
We introduce the Minimum Entropy Method, a simple statistical technique for constraining the Milky Way gravitational potential and simultaneously testing different gravity theories directly from 6D