On the identification of substructure in phase-space using orbital frequencies

Abstract

We study the evolution of satellite debris to establish the most suitable space to identify past merger events. We confirm that the space of orbital frequencies is very promising in this respect. In frequency space individual streams can be easily identified, and their separation provides a direct measurement of the time of accretion. We are able to show for a few idealised gravitational potentials that these features are preserved also in systems that have evolved strongly in time. Furthermore, this time evolution is imprinted in the distribution of streams in frequency space. We have also tested the power of the orbital frequencies in a fully self-consistent (live) N-body simulation of the merger between a disk galaxy and a massive satellite. Even in this case streams can be easily identified and the time of accretion of the satellite can be accurately estimated.

17 pages. MNRAS accepted. Revised to reflect final version

References in corpus (15)

• SEGUE: A Spectroscopic Survey of 240,000 stars with g=14-20
• Forming Disk Galaxies in Lambda CDM Simulations
• The Radial Velocity Experiment (RAVE): Fifth Data Release
• The Radial Velocity Experiment (RAVE): second data release
• Detection of a 60 Degree-Long Dwarf Galaxy Debris Stream
• The Galaxy and its stellar halo: insights on their formation from a hybrid cosmological approach
• Kinematics of SDSS subdwarfs: Structure and substructure of the Milky Way halo
• Is the Milky Way ringing? The hunt for high velocity streams
• The fine-grained phase-space structure of Cold Dark Matter halos
• Stellar Kinematic Constraints on Galactic Structure Models Revisited: Bar and Spiral Arm Resonances
• Disassembling the Galaxy with angle-action coordinates
• Halo streams in the 7th SDSS data release
• The Adiabatic Invariance of the Action Variable in Classical Dynamics
• The Tidal Streams of Disrupting Subhaloes in Cosmological Dark Matter Haloes
• Simulations of minor mergers. I. General properties of thick disks

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• Herschel far-infrared observations of the Carina Nebula complex II: The embedded young stellar and protostellar population
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• Insight Into the Formation of the Milky Way Through Cold Halo Substructure. II. The Elemental Abundances of ECHOS
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• The stellar halo in Local Group Hestia simulations II. The accreted component
• Simulating cosmological substructure in the solar neighbourhood
• Halo orbits in cosmological disk galaxies: tracers of formation history
• Molecules in η Carinae
• Predictions for the detection of Tidal Streams with Gaia using Great Circle Methods
• Detection of Satellite Remnants in the Galactic Halo with Gaia - II. A modified Great Circle Cell Method
• Substructures, Resonances and debris streams
• A new fitting-function to describe the time evolution of a galaxy's gravitational potential
• On the Edge: the relation between stellar and dark matter haloes of Milky Way-mass galaxies
• Ironing the folds: The phase space chevrons of a GSE-like merger as a dark matter subhalo detector
• Frequencies, chaos and resonances: a study of orbital parameters of nearby thick disc and halo stars
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• Cosmological Simulations of Stellar Halos with Gaia Sausage-Enceladus Analogues: Two Sausages, One Bun?
• The Interaction of the Eta Carinae Primary Wind with a Century Old Slow Equatorial Ejecta
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• On the behaviour of streams in angle and frequency spaces in different potentials
• Stirring Things Up: Bar-induced substructures in the stellar halo of a cosmological Milky Way analogue
• $\eta$ Carinae: particle acceleration and multi-messenger aspects
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