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Determining the Galactic Mass Distribution Using Tidal Streams from Globular Clusters
1999
Astronomical Journal
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We discuss how to use tidal streams from globular clusters to measure the mass distribution of the Milky Way. ...
for stream stars; and another using a simple chi^2 estimator, which can be used when only projected positions and radial velocities are known for stream stars. ...
What we describe is a procedure for fitting a projected tidal stream to the observational data using a χ 2 estimator. ...
doi:10.1086/300971
fatcat:6jbznv2p3zeu5c4tupuy3vii3q
GLOBULAR CLUSTER STREAMS AS GALACTIC HIGH-PRECISION SCALES—THE POSTER CHILD PALOMAR 5
2015
Astrophysical Journal
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Using the example of the tidal stream of the Milky Way globular cluster Palomar 5 (Pal 5), we demonstrate how observational data on streams can be efficiently reduced in dimensionality and modeled in a ...
We also determine Pal 5's mass, distance and proper motion independently from other methods, which enables us to perform vital cross-checks. ...
us understand the other mass estimates better. ...
doi:10.1088/0004-637x/803/2/80
fatcat:vb5vpbh27fetjb6llhfptzg3cy
THE PAL 5 STAR STREAM GAPS
2012
Astrophysical Journal
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We use the SDSS DR8 data to extend the density measurements of the trailing star stream to 23 degrees distance from the cluster, at which point the stream runs off the edge of the available sky coverage ...
The statistical significance of a gap is estimated using bootstrap re-sampling of the control regions on either side of the stream. ...
Adopting mean ages rather than end-point ages for the streams doubles the estimated gap rates and helps bring the data into agreement with the prediction. ...
doi:10.1088/0004-637x/760/1/75
fatcat:mm36mnli5vgbre6n3tkzylfheq
Galactic potential constraints from clustering in action space of combined stellar stream data
[article]
2021
arXiv
pre-print
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When including the Helmi stream in the data set, the mass uncertainty increases to M(< 20 kpc) = 3.12^+3.21_-0.46× 10^11 M_⊙. ...
We find that we can only constrain the enclosed mass, and that the strongest constraints come from the GD-1, Pal 5 and Orphan streams whose combined data set yields M(< 20 kpc) = 2.96^+0.25_-0.26× 10^11M ...
This work has made use of data from the European Space Agency (ESA) mission Gaia (https://www.cosmos.esa.int/gaia), processed by the Gaia Data Processing and Analysis Consortium (DPAC, https:// www.cosmos.esa.int ...
arXiv:2007.00356v2
fatcat:n6qj553w2jauvabopxcthifgvy
Globular Cluster Streams as Galactic High-Precision Scales
2015
Proceedings of the International Astronomical Union
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With the example of Palomar 5, we demonstrate how modeling of a globular cluster stream allows us to simultaneously measure the properties of the disrupting globular cluster, its orbital motion, and the ...
Tidal streams of globular clusters are ideal tracers of the Galactic gravitational potential. ...
Mass estimates are accurate up to the uncertainties of globular cluster mass-to-light ratios, i.e., about a factor of two, (b) the simple stellar compositions of globular clusters, furthermore, allow for ...
doi:10.1017/s1743921315006742
fatcat:65tdqqmnlfg5xleuizkfskywjq
Dating the Tidal Disruption of Globular Clusters with GAIA Data on Their Stellar Streams
2018
Astrophysical Journal Letters
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2018 pre-print arXiv:1804.07770v1 fatcat:2ogxw43yibcxvcpiyjii5huwzaOther Versions
Here, we present a new technique for estimating the age of tidally disrupted globular cluster streams using the proper motions and parallaxes of tracer stars. ...
The age can be deduced from astrometry using a modest number of stars, with the error on this estimate depending on the proximity of the stream and the number of tracer stars used. ...
We are grateful to Long Wang for providing extensive support in the setup and use of Nbody6++, and to Adrian Jenkins for giving us access to his codes for generating cosmological initial conditions. ...
doi:10.3847/2041-8213/aac48c
fatcat:jojnarosrbbpfdxjkrxriqbq3y
Galactic potential constraints from clustering in action space of combined stellar stream data
2021
Monthly notices of the Royal Astronomical Society
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When including the Helmi stream in the data set, the mass uncertainty increases to $M(< 20\ \mathrm{kpc}) = 3.12^{+3.21}_{-0.46} \times 10^{11} \ M_{\odot }$. ...
We find that we can only constrain the enclosed mass, and that the strongest constraints come from the GD-1, Pal 5 and Orphan streams whose combined data set yields $M(< 20\ \mathrm{kpc}) = 2.96^{+0.25 ...
Funding for
A3 Palomar 5 stream data We use 2 literature sources to create a list of Palomar 5 stream members with a full 6D phase space map. ...
doi:10.1093/mnras/stab304
fatcat:4whzn22mmzdjhir42jy65dcwqa
MILKY WAY MASS AND POTENTIAL RECOVERY USING TIDAL STREAMS IN A REALISTIC HALO
2014
Astrophysical Journal
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Collectively, mass estimates using streams from our sample reach this fundamental limit, but individually they can be highly biased. ...
We estimate that the assumption of a static and smooth dark matter potential in modeling of the GD-1 and Pal5-like streams introduces an error of up to 50% in the Milky Way mass estimates. ...
This work has made use of the SuperMUC and zBox supercomputers at LRZ Garching, Germany and University of Zürich, Switzerland. ...
doi:10.1088/0004-637x/795/1/94
fatcat:mycagxmqrbfdzb54xyn7tcn7si
Divisive clustering of high dimensional data streams
2015
Statistics and computing
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Clustering streaming data is gaining importance as automatic data acquisition technologies are deployed in diverse applications. ...
We propose a fully incremental projected divisive clustering method for high-dimensional data streams that is motivated by high density clustering. ...
In Section 2 we discuss some existing data stream clustering algorithms. ...
doi:10.1007/s11222-015-9597-y
fatcat:4cyk7tp3bzevjngzpr76zdx4fy
Stream–orbit misalignment – II. A new algorithm to constrain the Galactic potential
2013
Monthly notices of the Royal Astronomical Society
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2013 pre-print arXiv:1305.1937v1 fatcat:43z26i5vezdn5ctmslebnooiiq
This approach is independent of the progenitor mass so is valid for all observed tidal streams. ...
Motivated by the need for an improvement on orbit-fitting, we now present an algorithm for constraining the Galactic potential using tidal streams without assuming that streams delineate orbits. ...
We also thank the anonymous referee for their useful suggestions which have improved the paper. ...
doi:10.1093/mnras/stt816
fatcat:a63rg7prifbajocw7rkhkqszwq
Packing fraction of clusters formed in free-falling granular streams based on flash X-ray radiography
[article]
2021
arXiv
pre-print
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We study the packing fraction of clusters in free-falling streams of spherical and irregularly shaped particles using flash X-ray radiography. ...
The estimated packing fraction of clusters is low enough to correspond to coordination numbers less than 6. ...
The stream of irregular particles showed rapid and easy cluster formation, which had a larger width than that of spherical particles.To estimate the packing fraction of the streams using Eq. (1-3), we ...
arXiv:2103.04017v2
fatcat:jjbvwfae7zfqtg7pbotj3xhw5u
VALIDITY OF HYDROSTATIC EQUILIBRIUM IN GALAXY CLUSTERS FROM COSMOLOGICAL HYDRODYNAMICAL SIMULATIONS
2013
Astrophysical Journal
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2013 pre-print arXiv:1302.5172v1 fatcat:whw2b3757navbko2snocb5zicu
We find that the mass estimated under the HSE assumption (the HSE mass) deviates from the true mass by up to ~ 30 %. ...
We examine the validity of the hydrostatic equilibrium (HSE) assumption for galaxy clusters using one of the highest-resolution cosmological hydrodynamical simulations. ...
We also thank Klaus Dolag for kindly providing us with SPH simulation data and calculating the gas acceleration, and Fujihiro Hamba for a useful comment on the interpretation of the inertial term in the ...
doi:10.1088/0004-637x/767/1/79
fatcat:njvvqvzft5cw3bdahwwz6svd3u
Uncovering fossils of the distant Milky Way with UNIONS: NGC 5466 and its stellar stream
[article]
2021
arXiv
pre-print
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Using both BHBs and more numerous red giant branch stars cross-matched to Gaia Data Release 2, we identify extended tidal tails from NGC 5466 that are both spatially and kinematically coherent. ...
Interestingly, we find that this stream does not follow the same path as the previous detection at large distances from the cluster. ...
This work is based on data obtained as part of the Canada-France Imaging Survey (CFIS), a CFHT large program of the National Research Council of Canada and the French Centre National de la Recherche Scientifique ...
arXiv:2108.04340v1
fatcat:wwqoemrp6nfm3dzrra5kqrw3be
Estimate of the Mass and Radial Profile of the Orphan-Chenab Stream's Dwarf Galaxy Progenitor Using MilkyWay@home
[article]
2022
arXiv
pre-print
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Within the progenitor's half-light radius, we estimate total a mass of (4.0±1.0)×10^5M_⊙. ...
We optimize the evolution time, the baryonic and dark matter scale radii, and the baryonic and dark matter masses of the progenitor using a differential evolution algorithm. ...
This implies that using a globular cluster for the mass estimate of a stellar system with a bluer peak color overestimates its mass. ...
arXiv:2201.03637v1
fatcat:pfij3nlkmva2nlqj6ociguuabi
Estimating the ages of open star clusters from properties of their extended tidal tails
[article]
2021
arXiv
pre-print
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Since at a given Galactocentric radius, β is only a function of age t regardless of the initial properties of the cluster, we estimate the cluster age by inverting the analytical formula β = β (t). ...
as the cluster (i.e. being coeval with the cluster), we derive the analytical formula for the tilt angle β between the long axis of the tidal tail and the orbital direction for clusters or streams on ...
We attempted to use the same analytical approach for estimating the initial mass of the clusters from the width of the tidal structure, but this yielded substantially lower masses than the masses of the ...
arXiv:2112.03940v1
fatcat:prcaqhy3nvhgjedy72flmwatam
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