Tidal Streams in the Local Group and Beyond

Newberg, Heidi Jo; Carlin, Jeffrey L.

doi:10.1007/978-3-319-19336-6

Cited by 37 publications

(8 citation statements)

References 458 publications

(709 reference statements)

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“…This is because Gaia has enabled a vast increase in the number of stars for which six-dimensional phase space coordinates are obtainable. While many of the largest and most famous stellar streams are readily identifiable on the sky from photometry alone [16], phase space information is essential in identifying nearby streams that are dispersed over large areas of the sky.…”

Section: Introductionmentioning

confidence: 99%

Velocity substructure from Gaia and direct searches for dark matter

et al. 2020

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Data from the Gaia satellite show that the solar neighbourhood of the Milky Way's stellar halo is imprinted with substructure from several accretion events. Evidence of these events is found in "the Shards", stars clustering with high significance in both action space and metallicity. Stars in the Shards share a common origin, likely as ancient satellite galaxies of the Milky Way, so will be embedded in dark matter (DM) counterparts. These "Dark Shards" contain two substantial streams (S1 and S2), as well as several retrograde, prograde and lower energy objects. The retrograde stream S1 has a very high Earth-frame speed of ∼ 550 km s −1 while S2 moves on a prograde, but highly polar orbit and enhances peak of the speed distribution at around 300 km s −1 . The presence of the Dark Shards locally leads to modifications of many to the fundamental properties of experimental DM signals. The S2 stream in particular gives rise to an array of effects in searches for axions and in the time dependence of nuclear recoils: shifting the peak day, inducing non-sinusoidal distortions, and increasing the importance of the gravitational focusing of DM by the Sun. Dark Shards additionally bring new features for directional signals, while also enhancing the DM flux towards Cygnus.

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Section: Introductionmentioning

confidence: 99%

Velocity substructure from Gaia and direct searches for dark matter

et al. 2020

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“…Many stellar streams have been detected as overdensities of resolved stars against the background (see Newberg and Carlin [18] for reviews). However, there is a much more powerful method of detection that will enable the identification of ∼ 100−200 streams in the inner halo of the MW over the next few years.…”

Section: Introductionmentioning

confidence: 99%

Dark matter hurricane: Measuring the S1 stream with dark matter detectors

O’Hare¹,

McCabe²,

Evans³

et al. 2018

Phys. Rev. D

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The recently discovered S1 stream passes through the Solar neighbourhood on a low inclination, counter-rotating orbit. The progenitor of S1 is a dwarf galaxy with a total mass comparable to the present-day Fornax dwarf spheroidal, so the stream is expected to have a significant DM component. We compute the effects of the S1 stream on WIMP and axion detectors as a function of the density of its unmeasured dark component. In WIMP detectors the S1 stream supplies more high energy nuclear recoils so will marginally improve DM detection prospects. We find that even if S1 comprises less than 10% of the local density, multi-ton xenon WIMP detectors can distinguish the S1 stream from the bulk halo in the relatively narrow mass range between 5 and 25 GeV. In directional WIMP detectors such as CYGNUS, S1 increases DM detection prospects more substantially since it enhances the anisotropy of the WIMP signal. Finally, we show that axion haloscopes possess by far the greatest potential sensitivity to the S1 stream if its dark matter component is sufficiently cold. Once the axion mass has been discovered, the distinctive velocity distribution of S1 can easily be extracted from the axion power spectrum.

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“…They are presumably formed from disruption of globular clusters and dwarf galaxies as those objects fall into the gravitational potential well of and virialize with their host halo. See [245] for a recent and comprehensive historical and methodological overview of stream finding in and around the MW.…”

Section: Stellar Streamsmentioning

confidence: 99%

The Milky Way, Coming into Focus: Precision Astrometry Probes its Evolution, and its Dark Matter

Gardner,

McDermott,

Yanny

2021

Preprint

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The growing trove of precision astrometric observations from the Gaia space telescope and other surveys is revealing the structure and dynamics of the Milky Way in ever more exquisite detail. We summarize the current status of our understanding of the structure and the characteristics of the Milky Way, and we review the emerging picture: the Milky Way is evolving through interactions with the massive satellite galaxies that stud its volume, with evidence pointing to a cataclysmic past. It is also woven with stellar streams, and observations of streams, satellites, and field stars offer new constraints on its dark matter, both on its spatial distribution and its fundamental nature. The recent years have brought much focus to the study of dwarf galaxies found within our Galaxy's halo and their internal matter distributions. In this review, we focus on the predictions of the cold dark matter paradigm at small mass scales through precision astrometric measurements, and we summarize the modern consensus on the extent to which small-scale probes are consistent with this paradigm. We note the discovery prospects of these studies, and also how they intertwine with probes of the dynamics and evolution of the Milky Way in various and distinct ways.

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Tidal Streams in the Local Group and Beyond

Cited by 37 publications

References 458 publications

Velocity substructure from Gaia and direct searches for dark matter

Velocity substructure from Gaia and direct searches for dark matter

Dark matter hurricane: Measuring the S1 stream with dark matter detectors

The Milky Way, Coming into Focus: Precision Astrometry Probes its Evolution, and its Dark Matter

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