Proper Motions of Stellar Streams Discovered in the Dark Energy Survey

Shipp, Nora; Li, Ting S.; Pace, Andrew B.; Erkal, Denis; Drlica-Wagner, A.; Yanny, B.; Belokurov, V.; Wester, W.; Koposov, S. E.; Kuêhn, K.; Lewis, Geraint F.; Simpson, Jeffrey D.; Wan, Zhen; Zucker, D. B.; Martell, Sarah L.; Wang, M. Y.

doi:10.3847/1538-4357/ab44bf

Cited by 91 publications

(98 citation statements)

References 99 publications

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“…This is 10× larger than conventionally assumed for the LMC. Recently, it was shown that such a high LMC mass will not perturb the MW's disk to levels inconsistent with observations [62] and is both supported by the timing argument [63] and needed to explain the kinematics of the Orphan Stream [64] (and likely many other stellar streams whose kinematics are now measured by Gaia [65]). Furthermore, such high infall mass prevents the LMC disk from being tidally truncated by the MW, explaining new results that the LMC's outer stellar disk extends to a radius approximately half its current separation to the MW (∼ 18.5 kpc; [66,67]).…”

Section: The Lmc: a Massive Satellite On First Infallmentioning

confidence: 94%

The highest-speed local dark matter particles come from the Large Magellanic Cloud

Besla

Peter

Garavito-Camargo

2019

J. Cosmol. Astropart. Phys.

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Using N-body simulations of the Large Magellanic Cloud (LMC's) passage through the Milky Way (MW), tailored to reproduce observed kinematic properties of both galaxies, we show that the high-speed tail of the Solar Neighborhood dark matter distribution is overwhelmingly of LMC origin. Two populations contribute at high speeds: 1) Particles that were once bound to the LMC, and 2) MW halo particles that have been accelerated owing to the response of the halo to the recent passage of the LMC. These particles reach speeds of 700-900 km/s with respect to the Earth, above the local escape speed of the MW. The high-speed particles follow trajectories similar to the Solar reflex motion, with peak velocities reached in June. For low-mass dark matter, these high-speed particles can dominate the signal in direct-detection experiments, extending the reach of the experiments to lower mass and elastic scattering cross sections even with existing data sets. Our study shows that even non-disrupted MW satellite galaxies can leave a significant dark matter footprint in the Solar Neighborhood.

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Section: The Lmc: a Massive Satellite On First Infallmentioning

confidence: 94%

The highest-speed local dark matter particles come from the Large Magellanic Cloud

Besla

Peter

Garavito-Camargo

2019

J. Cosmol. Astropart. Phys.

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“…The candidate PSF stars were taken to be this locus of objects from about ≈ 16, where the objects begin to saturate, down to ≈ 22, where the stellar locus merges with the locus of faint, small galaxies (the stars magnitudes are always relative to the exposure/band where the stars have been detected). The stellar density varies across the DES footprint; it tends to be higher in those exposures closer to the galactic plane and in the presence of stellar streams (see Shipp et al 2018 for more details).…”

Section: Selection Of Psf Starsmentioning

confidence: 99%

Dark energy survey year 3 results: weak lensing shape catalogue

Gatti

Sheldon

Amon

et al. 2021

Monthly Notices of the Royal Astronomical Society

123

178

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We present and characterise the galaxy shape catalogue from the first 3 years of Dark Energy Survey (DES) observations, over an effective area of 4143 deg2 of the southern sky. We describe our data analysis process and our self-calibrating shear measurement pipeline metacalibration, which builds and improves upon the pipeline used in the DES Year 1 analysis in several aspects. The DES Year 3 weak-lensing shape catalogue consists of 100,204,026 galaxies, measured in the riz bands, resulting in a weighted source number density of neff = 5.59 gal/arcmin2 and corresponding shape noise σe = 0.261. We perform a battery of internal null tests on the catalogue, including tests on systematics related to the point-spread function (PSF) modelling, spurious catalogue B-mode signals, catalogue contamination, and galaxy properties.

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“…Clearly the density perturbations induced by the LMC are complex -the Milky Way's dark matter halo shape is not accurately described as a spherical, oblate, prolate, or triaxial halo. It was recently shown that perturbations from a massive (∼ 10 11 ) LMC are required to match proper motion data from Gaia in simulations of the Orphan stellar stream (Erkal et al 2019;Shipp et al 2019). However, missing in such stream models is the response of the Milky Way's halo to the presence of the LMC (halo wakes) and the distortions to the LMC's dark matter distribution caused by the tidal field of the Milky Way.…”

Section: Quantifying the Shape Of The Milky Way's Dark Matter Halo Inmentioning

confidence: 99%

The LMC vs. the Milky Way

Besla

Garavito-Camargo

2019

Proc. IAU

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Recent advancements in astrometry and in cosmological models of dark matter halo growth have significantly changed our understanding of the dynamics of the Local Group. The most dramatic changes owe to a new picture of the structure and dynamics of the Milky Way’s most massive satellite galaxy, the Large Magellanic Cloud (LMC), which is most likely on its first passage about the Milky Way and ten times larger in mass than previously assumed. The LMC’s orbit through the Milky Way’s dark matter and stellar halo will leave characteristic signatures in both density and kinematics. Furthermore, the gravitational perturbations produced by both direct tidal forcing from the LMC and the response of the halo to its passage will together cause significant perturbations to the orbits of tracers of the Milky Way’s dark matter distribution. We advocate for the use of basis field expansion methods to fully capture and quantify these effects.

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Proper Motions of Stellar Streams Discovered in the Dark Energy Survey

Cited by 91 publications

References 99 publications

The highest-speed local dark matter particles come from the Large Magellanic Cloud

The highest-speed local dark matter particles come from the Large Magellanic Cloud

Dark energy survey year 3 results: weak lensing shape catalogue

The LMC vs. the Milky Way

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