Stellar streams as probes of dark halo mass and morphology: a Bayesian reconstruction
Identifieur interne : 006700 ( Main/Merge ); précédent : 006699; suivant : 006701Stellar streams as probes of dark halo mass and morphology: a Bayesian reconstruction
Auteurs : A. Varghese [France] ; R. Ibata [France] ; G. F. Lewis [Australie]Source :
- Monthly Notices of the Royal Astronomical Society [ 0035-8711 ] ; 2011-10-11.
Descripteurs français
- Wicri :
- topic : Simulation.
English descriptors
- KwdEn :
- Additional data, Additional information, Algorithm, Attening, Axisymmetric, Baryonic components, Binney, Binney tremaine, Black dots, Bottom panels, Central density, Certain point, Circular velocities, Circular velocity, Coldest chain, Coldest mcmc chain, Core radius, Correction mechanism, Corresponding distributions, Current position, Cyan, Cyan lines, Cyan squares, Dark halo, Dark halo probes, Dark halo probes figure, Dark haloes, Dark matter, Dark matter haloes, Data point, Data points, Degenerate, Dehnen, Dehnen binney, Density distribution, Different kinds, Different values, Disc components, Disc galaxies, Distant systems, Dubinski, Dubinski carlberg, Dynamical friction, Estimation, Free parameter, Free parameters, Full parameter space, Galactic, Galactic evolution, Galaxy, Gaussian distribution, Globular clusters, Good estimate, Green lines, Grey curve, Halo, Halo mass, Halo parameters, Halo shapes, Higher temperature chains, Host galaxy, Host halo, Ibata, Incorrect estimates, Individual streams, Infalling satellite, Initial coordinates, Initial distance, Initial point, Initial position, Initial positions, Initial velocities, Inner mass distribution, Inner power slope, Inner slope, Input value, Integration time, Irwin, Kinematic, Kinematic data, Kinematic information, Kruit, Large sample, Lewis figure, Logarithmic, Logarithmic halo, Logarithmic orbits, Majewski, Many cases, Matter distribution, Maximum likelihood estimation, Mcmc, Mnras, Model parameters, Monthly notices, More information, Multidimensional parameter space, Multipole expansion, Next point, Orbit, Orbital, Orbital parameters, Other parameters, Outer power, Outer power slope, Parallel chains, Parameter, Parameter distributions, Parameter space, Parameter values, Particular example, Past orbit, Pericentre passages, Positional information, Potential parameters, Present study, Present work, Previous section, Progenitor, Progenitor distance, Progenitor orbit, Prolate halo, Proposal distribution, Reasonable ranges, Rightmost panels show, Rotational, Rotational curve, Rotational velocity curve, Same point, Scale radius, Several points, Short stream, Sign discrepancy, Simulation, Single chain, Small variations, Smaller peak, Spatial projection, Spheroidal, Spheroidal halo, Spiral galaxies, Statistical approach, Stellar, Stellar components, Stellar streams, Stream, Stream data, Stream stars, Such information, Tail stars, Tangential velocity components, Test stream, Test streams, Thick disc, Thin disc, Tidal, Tidal disruption, Tidal stream, Tidal streams, Tidal tails, Total mass, Trial orbits, Trial point, Trial points, Trial stream, Trial streams, Triaxial, Triaxial halo, Triaxial models, True value, True values, Truncation radius, Tting, Tting data, Tting routines, Tting stream, Tting streams, Varghese, Velocity components, Velocity data points, Velocity information, Velocity space.
- Teeft :
- Additional data, Additional information, Algorithm, Attening, Axisymmetric, Baryonic components, Binney, Binney tremaine, Black dots, Bottom panels, Central density, Certain point, Circular velocities, Circular velocity, Coldest chain, Coldest mcmc chain, Core radius, Correction mechanism, Corresponding distributions, Current position, Cyan, Cyan lines, Cyan squares, Dark halo, Dark halo probes, Dark halo probes figure, Dark haloes, Dark matter, Dark matter haloes, Data point, Data points, Degenerate, Dehnen, Dehnen binney, Density distribution, Different kinds, Different values, Disc components, Disc galaxies, Distant systems, Dubinski, Dubinski carlberg, Dynamical friction, Estimation, Free parameter, Free parameters, Full parameter space, Galactic, Galactic evolution, Galaxy, Gaussian distribution, Globular clusters, Good estimate, Green lines, Grey curve, Halo, Halo mass, Halo parameters, Halo shapes, Higher temperature chains, Host galaxy, Host halo, Ibata, Incorrect estimates, Individual streams, Infalling satellite, Initial coordinates, Initial distance, Initial point, Initial position, Initial positions, Initial velocities, Inner mass distribution, Inner power slope, Inner slope, Input value, Integration time, Irwin, Kinematic, Kinematic data, Kinematic information, Kruit, Large sample, Lewis figure, Logarithmic, Logarithmic halo, Logarithmic orbits, Majewski, Many cases, Matter distribution, Maximum likelihood estimation, Mcmc, Mnras, Model parameters, Monthly notices, More information, Multidimensional parameter space, Multipole expansion, Next point, Orbit, Orbital, Orbital parameters, Other parameters, Outer power, Outer power slope, Parallel chains, Parameter, Parameter distributions, Parameter space, Parameter values, Particular example, Past orbit, Pericentre passages, Positional information, Potential parameters, Present study, Present work, Previous section, Progenitor, Progenitor distance, Progenitor orbit, Prolate halo, Proposal distribution, Reasonable ranges, Rightmost panels show, Rotational, Rotational curve, Rotational velocity curve, Same point, Scale radius, Several points, Short stream, Sign discrepancy, Simulation, Single chain, Small variations, Smaller peak, Spatial projection, Spheroidal, Spheroidal halo, Spiral galaxies, Statistical approach, Stellar, Stellar components, Stellar streams, Stream, Stream data, Stream stars, Such information, Tail stars, Tangential velocity components, Test stream, Test streams, Thick disc, Thin disc, Tidal, Tidal disruption, Tidal stream, Tidal streams, Tidal tails, Total mass, Trial orbits, Trial point, Trial points, Trial stream, Trial streams, Triaxial, Triaxial halo, Triaxial models, True value, True values, Truncation radius, Tting, Tting data, Tting routines, Tting stream, Tting streams, Varghese, Velocity components, Velocity data points, Velocity information, Velocity space.
Abstract
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 streams do not delineate orbits, and for most streams, especially those in external galaxies, kinematic information is absent. We present a method wherein streams are fitted with simple corrections made to possible orbits of the progenitor, using a Bayesian technique known as parallel tempering to efficiently explore the parameter space. We show that it is possible to constrain the shape of the host halo potential or its density distribution using only the projection of tidal streams on the sky, if the host halo is considered to be axisymmetric. By adding kinematic data or the circular velocity curve of the host to the fitting data, we are able to recover other parameters of the matter distribution such as its mass and profile. We test our method on several simulated low‐mass stellar streams and also explore the cases for which additional data are required.
Url:
DOI: 10.1111/j.1365-2966.2011.19097.x
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<profileDesc><textClass><keywords scheme="KwdEn" xml:lang="en"><term>Additional data</term>
<term>Additional information</term>
<term>Algorithm</term>
<term>Attening</term>
<term>Axisymmetric</term>
<term>Baryonic components</term>
<term>Binney</term>
<term>Binney tremaine</term>
<term>Black dots</term>
<term>Bottom panels</term>
<term>Central density</term>
<term>Certain point</term>
<term>Circular velocities</term>
<term>Circular velocity</term>
<term>Coldest chain</term>
<term>Coldest mcmc chain</term>
<term>Core radius</term>
<term>Correction mechanism</term>
<term>Corresponding distributions</term>
<term>Current position</term>
<term>Cyan</term>
<term>Cyan lines</term>
<term>Cyan squares</term>
<term>Dark halo</term>
<term>Dark halo probes</term>
<term>Dark halo probes figure</term>
<term>Dark haloes</term>
<term>Dark matter</term>
<term>Dark matter haloes</term>
<term>Data point</term>
<term>Data points</term>
<term>Degenerate</term>
<term>Dehnen</term>
<term>Dehnen binney</term>
<term>Density distribution</term>
<term>Different kinds</term>
<term>Different values</term>
<term>Disc components</term>
<term>Disc galaxies</term>
<term>Distant systems</term>
<term>Dubinski</term>
<term>Dubinski carlberg</term>
<term>Dynamical friction</term>
<term>Estimation</term>
<term>Free parameter</term>
<term>Free parameters</term>
<term>Full parameter space</term>
<term>Galactic</term>
<term>Galactic evolution</term>
<term>Galaxy</term>
<term>Gaussian distribution</term>
<term>Globular clusters</term>
<term>Good estimate</term>
<term>Green lines</term>
<term>Grey curve</term>
<term>Halo</term>
<term>Halo mass</term>
<term>Halo parameters</term>
<term>Halo shapes</term>
<term>Higher temperature chains</term>
<term>Host galaxy</term>
<term>Host halo</term>
<term>Ibata</term>
<term>Incorrect estimates</term>
<term>Individual streams</term>
<term>Infalling satellite</term>
<term>Initial coordinates</term>
<term>Initial distance</term>
<term>Initial point</term>
<term>Initial position</term>
<term>Initial positions</term>
<term>Initial velocities</term>
<term>Inner mass distribution</term>
<term>Inner power slope</term>
<term>Inner slope</term>
<term>Input value</term>
<term>Integration time</term>
<term>Irwin</term>
<term>Kinematic</term>
<term>Kinematic data</term>
<term>Kinematic information</term>
<term>Kruit</term>
<term>Large sample</term>
<term>Lewis figure</term>
<term>Logarithmic</term>
<term>Logarithmic halo</term>
<term>Logarithmic orbits</term>
<term>Majewski</term>
<term>Many cases</term>
<term>Matter distribution</term>
<term>Maximum likelihood estimation</term>
<term>Mcmc</term>
<term>Mnras</term>
<term>Model parameters</term>
<term>Monthly notices</term>
<term>More information</term>
<term>Multidimensional parameter space</term>
<term>Multipole expansion</term>
<term>Next point</term>
<term>Orbit</term>
<term>Orbital</term>
<term>Orbital parameters</term>
<term>Other parameters</term>
<term>Outer power</term>
<term>Outer power slope</term>
<term>Parallel chains</term>
<term>Parameter</term>
<term>Parameter distributions</term>
<term>Parameter space</term>
<term>Parameter values</term>
<term>Particular example</term>
<term>Past orbit</term>
<term>Pericentre passages</term>
<term>Positional information</term>
<term>Potential parameters</term>
<term>Present study</term>
<term>Present work</term>
<term>Previous section</term>
<term>Progenitor</term>
<term>Progenitor distance</term>
<term>Progenitor orbit</term>
<term>Prolate halo</term>
<term>Proposal distribution</term>
<term>Reasonable ranges</term>
<term>Rightmost panels show</term>
<term>Rotational</term>
<term>Rotational curve</term>
<term>Rotational velocity curve</term>
<term>Same point</term>
<term>Scale radius</term>
<term>Several points</term>
<term>Short stream</term>
<term>Sign discrepancy</term>
<term>Simulation</term>
<term>Single chain</term>
<term>Small variations</term>
<term>Smaller peak</term>
<term>Spatial projection</term>
<term>Spheroidal</term>
<term>Spheroidal halo</term>
<term>Spiral galaxies</term>
<term>Statistical approach</term>
<term>Stellar</term>
<term>Stellar components</term>
<term>Stellar streams</term>
<term>Stream</term>
<term>Stream data</term>
<term>Stream stars</term>
<term>Such information</term>
<term>Tail stars</term>
<term>Tangential velocity components</term>
<term>Test stream</term>
<term>Test streams</term>
<term>Thick disc</term>
<term>Thin disc</term>
<term>Tidal</term>
<term>Tidal disruption</term>
<term>Tidal stream</term>
<term>Tidal streams</term>
<term>Tidal tails</term>
<term>Total mass</term>
<term>Trial orbits</term>
<term>Trial point</term>
<term>Trial points</term>
<term>Trial stream</term>
<term>Trial streams</term>
<term>Triaxial</term>
<term>Triaxial halo</term>
<term>Triaxial models</term>
<term>True value</term>
<term>True values</term>
<term>Truncation radius</term>
<term>Tting</term>
<term>Tting data</term>
<term>Tting routines</term>
<term>Tting stream</term>
<term>Tting streams</term>
<term>Varghese</term>
<term>Velocity components</term>
<term>Velocity data points</term>
<term>Velocity information</term>
<term>Velocity space</term>
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<keywords scheme="Teeft" xml:lang="en"><term>Additional data</term>
<term>Additional information</term>
<term>Algorithm</term>
<term>Attening</term>
<term>Axisymmetric</term>
<term>Baryonic components</term>
<term>Binney</term>
<term>Binney tremaine</term>
<term>Black dots</term>
<term>Bottom panels</term>
<term>Central density</term>
<term>Certain point</term>
<term>Circular velocities</term>
<term>Circular velocity</term>
<term>Coldest chain</term>
<term>Coldest mcmc chain</term>
<term>Core radius</term>
<term>Correction mechanism</term>
<term>Corresponding distributions</term>
<term>Current position</term>
<term>Cyan</term>
<term>Cyan lines</term>
<term>Cyan squares</term>
<term>Dark halo</term>
<term>Dark halo probes</term>
<term>Dark halo probes figure</term>
<term>Dark haloes</term>
<term>Dark matter</term>
<term>Dark matter haloes</term>
<term>Data point</term>
<term>Data points</term>
<term>Degenerate</term>
<term>Dehnen</term>
<term>Dehnen binney</term>
<term>Density distribution</term>
<term>Different kinds</term>
<term>Different values</term>
<term>Disc components</term>
<term>Disc galaxies</term>
<term>Distant systems</term>
<term>Dubinski</term>
<term>Dubinski carlberg</term>
<term>Dynamical friction</term>
<term>Estimation</term>
<term>Free parameter</term>
<term>Free parameters</term>
<term>Full parameter space</term>
<term>Galactic</term>
<term>Galactic evolution</term>
<term>Galaxy</term>
<term>Gaussian distribution</term>
<term>Globular clusters</term>
<term>Good estimate</term>
<term>Green lines</term>
<term>Grey curve</term>
<term>Halo</term>
<term>Halo mass</term>
<term>Halo parameters</term>
<term>Halo shapes</term>
<term>Higher temperature chains</term>
<term>Host galaxy</term>
<term>Host halo</term>
<term>Ibata</term>
<term>Incorrect estimates</term>
<term>Individual streams</term>
<term>Infalling satellite</term>
<term>Initial coordinates</term>
<term>Initial distance</term>
<term>Initial point</term>
<term>Initial position</term>
<term>Initial positions</term>
<term>Initial velocities</term>
<term>Inner mass distribution</term>
<term>Inner power slope</term>
<term>Inner slope</term>
<term>Input value</term>
<term>Integration time</term>
<term>Irwin</term>
<term>Kinematic</term>
<term>Kinematic data</term>
<term>Kinematic information</term>
<term>Kruit</term>
<term>Large sample</term>
<term>Lewis figure</term>
<term>Logarithmic</term>
<term>Logarithmic halo</term>
<term>Logarithmic orbits</term>
<term>Majewski</term>
<term>Many cases</term>
<term>Matter distribution</term>
<term>Maximum likelihood estimation</term>
<term>Mcmc</term>
<term>Mnras</term>
<term>Model parameters</term>
<term>Monthly notices</term>
<term>More information</term>
<term>Multidimensional parameter space</term>
<term>Multipole expansion</term>
<term>Next point</term>
<term>Orbit</term>
<term>Orbital</term>
<term>Orbital parameters</term>
<term>Other parameters</term>
<term>Outer power</term>
<term>Outer power slope</term>
<term>Parallel chains</term>
<term>Parameter</term>
<term>Parameter distributions</term>
<term>Parameter space</term>
<term>Parameter values</term>
<term>Particular example</term>
<term>Past orbit</term>
<term>Pericentre passages</term>
<term>Positional information</term>
<term>Potential parameters</term>
<term>Present study</term>
<term>Present work</term>
<term>Previous section</term>
<term>Progenitor</term>
<term>Progenitor distance</term>
<term>Progenitor orbit</term>
<term>Prolate halo</term>
<term>Proposal distribution</term>
<term>Reasonable ranges</term>
<term>Rightmost panels show</term>
<term>Rotational</term>
<term>Rotational curve</term>
<term>Rotational velocity curve</term>
<term>Same point</term>
<term>Scale radius</term>
<term>Several points</term>
<term>Short stream</term>
<term>Sign discrepancy</term>
<term>Simulation</term>
<term>Single chain</term>
<term>Small variations</term>
<term>Smaller peak</term>
<term>Spatial projection</term>
<term>Spheroidal</term>
<term>Spheroidal halo</term>
<term>Spiral galaxies</term>
<term>Statistical approach</term>
<term>Stellar</term>
<term>Stellar components</term>
<term>Stellar streams</term>
<term>Stream</term>
<term>Stream data</term>
<term>Stream stars</term>
<term>Such information</term>
<term>Tail stars</term>
<term>Tangential velocity components</term>
<term>Test stream</term>
<term>Test streams</term>
<term>Thick disc</term>
<term>Thin disc</term>
<term>Tidal</term>
<term>Tidal disruption</term>
<term>Tidal stream</term>
<term>Tidal streams</term>
<term>Tidal tails</term>
<term>Total mass</term>
<term>Trial orbits</term>
<term>Trial point</term>
<term>Trial points</term>
<term>Trial stream</term>
<term>Trial streams</term>
<term>Triaxial</term>
<term>Triaxial halo</term>
<term>Triaxial models</term>
<term>True value</term>
<term>True values</term>
<term>Truncation radius</term>
<term>Tting</term>
<term>Tting data</term>
<term>Tting routines</term>
<term>Tting stream</term>
<term>Tting streams</term>
<term>Varghese</term>
<term>Velocity components</term>
<term>Velocity data points</term>
<term>Velocity information</term>
<term>Velocity space</term>
</keywords>
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<front><div type="abstract" xml:lang="en">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 streams do not delineate orbits, and for most streams, especially those in external galaxies, kinematic information is absent. We present a method wherein streams are fitted with simple corrections made to possible orbits of the progenitor, using a Bayesian technique known as parallel tempering to efficiently explore the parameter space. We show that it is possible to constrain the shape of the host halo potential or its density distribution using only the projection of tidal streams on the sky, if the host halo is considered to be axisymmetric. By adding kinematic data or the circular velocity curve of the host to the fitting data, we are able to recover other parameters of the matter distribution such as its mass and profile. We test our method on several simulated low‐mass stellar streams and also explore the cases for which additional data are required.</div>
</front>
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