Dark matter debris flows in the Milky Way

Mariangela Lisanti; David N. Spergel

doi:10.1016/j.dark.2012.10.007

Dark matter debris flows in the Milky Way

Mariangela Lisanti, David N. Spergel

Research output: Contribution to journal › Article › peer-review

53 Scopus citations

Abstract

We show that subhalos falling into the Milky Way create a flow of tidally-stripped debris particles near the Galactic center with characteristic speed behavior, but no spatial features. Using the Via Lactea-II N-body simulation, we study the unvirialized component arising from particles that were bound in subhalos around the time of reionization but have since been tidally stripped. These debris particles constitute a few percent of the local density today and have speeds peaked at 340 km/s in the solar neighborhood. This spatially-homogeneous velocity substructure has important implications for surveys of low-metallicity stars, as well as direct detection experiments sensitive to dark matter with large scattering thresholds.

Original language	English (US)
Pages (from-to)	155-161
Number of pages	7
Journal	Physics of the Dark Universe
Volume	1
Issue number	1-2
DOIs	https://doi.org/10.1016/j.dark.2012.10.007
State	Published - Nov 2012

All Science Journal Classification (ASJC) codes

Astronomy and Astrophysics
Space and Planetary Science

Keywords

Dark matter direct detection
Dark matter substructure

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10.1016/j.dark.2012.10.007

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@article{c97d23ed31f64c75b17be484d56d5b07,

title = "Dark matter debris flows in the Milky Way",

abstract = "We show that subhalos falling into the Milky Way create a flow of tidally-stripped debris particles near the Galactic center with characteristic speed behavior, but no spatial features. Using the Via Lactea-II N-body simulation, we study the unvirialized component arising from particles that were bound in subhalos around the time of reionization but have since been tidally stripped. These debris particles constitute a few percent of the local density today and have speeds peaked at 340 km/s in the solar neighborhood. This spatially-homogeneous velocity substructure has important implications for surveys of low-metallicity stars, as well as direct detection experiments sensitive to dark matter with large scattering thresholds.",

keywords = "Dark matter direct detection, Dark matter substructure",

author = "Mariangela Lisanti and Spergel, {David N.}",

note = "Funding Information: We are particularly grateful to Juerg Diemand for providing the Via Lactea raw data, and to Neil Weiner for his helpful feedback over the course of this work. In addition, we thank Daniele Alves, Juerg Diemand, Michael Kuhlen, Nikhil Padmanabhan, Constance Rockosi, and Jay Wacker for useful discussions. ML acknowledges support from the Simons Postdoctoral Fellows Program as well as the US National Science Foundation, grant NSF-PHY-0705682.",

year = "2012",

month = nov,

doi = "10.1016/j.dark.2012.10.007",

language = "English (US)",

volume = "1",

pages = "155--161",

journal = "Physics of the Dark Universe",

issn = "2212-6864",

publisher = "Elsevier B.V.",

number = "1-2",

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TY - JOUR

T1 - Dark matter debris flows in the Milky Way

AU - Lisanti, Mariangela

AU - Spergel, David N.

N1 - Funding Information: We are particularly grateful to Juerg Diemand for providing the Via Lactea raw data, and to Neil Weiner for his helpful feedback over the course of this work. In addition, we thank Daniele Alves, Juerg Diemand, Michael Kuhlen, Nikhil Padmanabhan, Constance Rockosi, and Jay Wacker for useful discussions. ML acknowledges support from the Simons Postdoctoral Fellows Program as well as the US National Science Foundation, grant NSF-PHY-0705682.

PY - 2012/11

Y1 - 2012/11

N2 - We show that subhalos falling into the Milky Way create a flow of tidally-stripped debris particles near the Galactic center with characteristic speed behavior, but no spatial features. Using the Via Lactea-II N-body simulation, we study the unvirialized component arising from particles that were bound in subhalos around the time of reionization but have since been tidally stripped. These debris particles constitute a few percent of the local density today and have speeds peaked at 340 km/s in the solar neighborhood. This spatially-homogeneous velocity substructure has important implications for surveys of low-metallicity stars, as well as direct detection experiments sensitive to dark matter with large scattering thresholds.

AB - We show that subhalos falling into the Milky Way create a flow of tidally-stripped debris particles near the Galactic center with characteristic speed behavior, but no spatial features. Using the Via Lactea-II N-body simulation, we study the unvirialized component arising from particles that were bound in subhalos around the time of reionization but have since been tidally stripped. These debris particles constitute a few percent of the local density today and have speeds peaked at 340 km/s in the solar neighborhood. This spatially-homogeneous velocity substructure has important implications for surveys of low-metallicity stars, as well as direct detection experiments sensitive to dark matter with large scattering thresholds.

KW - Dark matter direct detection

KW - Dark matter substructure

UR - http://www.scopus.com/inward/record.url?scp=84870183186&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=84870183186&partnerID=8YFLogxK

U2 - 10.1016/j.dark.2012.10.007

DO - 10.1016/j.dark.2012.10.007

M3 - Article

AN - SCOPUS:84870183186

SN - 2212-6864

VL - 1

SP - 155

EP - 161

JO - Physics of the Dark Universe

JF - Physics of the Dark Universe

IS - 1-2

ER -

Dark matter debris flows in the Milky Way

Abstract

All Science Journal Classification (ASJC) codes

Keywords

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