DARK MATTER ANNIHILATION and DECAY PROFILES for the RETICULUM II DWARF SPHEROIDAL GALAXY

Vincent Bonnivard; Céline Combet; David Maurin; Alex Geringer-Sameth; Savvas M. Koushiappas; Matthew G. Walker; Mario Mateo; Edward W. Olszewski; John I. Bailey

doi:10.1088/2041-8205/808/2/L36

DARK MATTER ANNIHILATION and DECAY PROFILES for the RETICULUM II DWARF SPHEROIDAL GALAXY

Vincent Bonnivard, Céline Combet, David Maurin, Alex Geringer-Sameth, Savvas M. Koushiappas, Matthew G. Walker, Mario Mateo, Edward W. Olszewski, John I. Bailey

Astronomy

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64 Scopus citations

Abstract

The dwarf spheroidal galaxies (dSph) of the Milky Way are among the most attractive targets for indirect searches of dark matter (DM). In this work, we reconstruct the DM annihilation (J-factor) and decay profiles for the newly discovered dSph Reticulum II. Using an optimized spherical Jeans analysis of kinematic data obtained from the Michigan/Magellan Fiber System, we find Reticulum II's J-factor to be among the largest of any Milky Way dSph. We have checked the robustness of this result against several ingredients of the analysis. Unless it suffers from tidal disruption or significant inflation of its velocity dispersion from binary stars, Reticulum II may provide a unique window on DM particle properties.

Original language	English (US)
Article number	L36
Journal	Astrophysical Journal Letters
Volume	808
Issue number	2
DOIs	https://doi.org/10.1088/2041-8205/808/2/L36
State	Published - Aug 1 2015

Keywords

dark matter
galaxies: dwarf
galaxies: individual (Reticulum II)
gamma rays: galaxies
methods: statistical
stars: kinematics and dynamics

ASJC Scopus subject areas

Astronomy and Astrophysics
Space and Planetary Science

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10.1088/2041-8205/808/2/L36

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title = "DARK MATTER ANNIHILATION and DECAY PROFILES for the RETICULUM II DWARF SPHEROIDAL GALAXY",

abstract = "The dwarf spheroidal galaxies (dSph) of the Milky Way are among the most attractive targets for indirect searches of dark matter (DM). In this work, we reconstruct the DM annihilation (J-factor) and decay profiles for the newly discovered dSph Reticulum II. Using an optimized spherical Jeans analysis of kinematic data obtained from the Michigan/Magellan Fiber System, we find Reticulum II's J-factor to be among the largest of any Milky Way dSph. We have checked the robustness of this result against several ingredients of the analysis. Unless it suffers from tidal disruption or significant inflation of its velocity dispersion from binary stars, Reticulum II may provide a unique window on DM particle properties.",

keywords = "dark matter, galaxies: dwarf, galaxies: individual (Reticulum II), gamma rays: galaxies, methods: statistical, stars: kinematics and dynamics",

author = "Vincent Bonnivard and C{\'e}line Combet and David Maurin and Alex Geringer-Sameth and Koushiappas, {Savvas M.} and Walker, {Matthew G.} and Mario Mateo and Olszewski, {Edward W.} and Bailey, {John I.}",

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doi = "10.1088/2041-8205/808/2/L36",

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AU - Bonnivard, Vincent

AU - Combet, Céline

AU - Maurin, David

AU - Geringer-Sameth, Alex

AU - Koushiappas, Savvas M.

AU - Walker, Matthew G.

AU - Mateo, Mario

AU - Olszewski, Edward W.

AU - Bailey, John I.

PY - 2015/8/1

Y1 - 2015/8/1

N2 - The dwarf spheroidal galaxies (dSph) of the Milky Way are among the most attractive targets for indirect searches of dark matter (DM). In this work, we reconstruct the DM annihilation (J-factor) and decay profiles for the newly discovered dSph Reticulum II. Using an optimized spherical Jeans analysis of kinematic data obtained from the Michigan/Magellan Fiber System, we find Reticulum II's J-factor to be among the largest of any Milky Way dSph. We have checked the robustness of this result against several ingredients of the analysis. Unless it suffers from tidal disruption or significant inflation of its velocity dispersion from binary stars, Reticulum II may provide a unique window on DM particle properties.

AB - The dwarf spheroidal galaxies (dSph) of the Milky Way are among the most attractive targets for indirect searches of dark matter (DM). In this work, we reconstruct the DM annihilation (J-factor) and decay profiles for the newly discovered dSph Reticulum II. Using an optimized spherical Jeans analysis of kinematic data obtained from the Michigan/Magellan Fiber System, we find Reticulum II's J-factor to be among the largest of any Milky Way dSph. We have checked the robustness of this result against several ingredients of the analysis. Unless it suffers from tidal disruption or significant inflation of its velocity dispersion from binary stars, Reticulum II may provide a unique window on DM particle properties.

KW - dark matter

KW - galaxies: dwarf

KW - galaxies: individual (Reticulum II)

KW - gamma rays: galaxies

KW - methods: statistical

KW - stars: kinematics and dynamics

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U2 - 10.1088/2041-8205/808/2/L36

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SN - 2041-8205

VL - 808

JO - Astrophysical Journal Letters

JF - Astrophysical Journal Letters

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M1 - L36

ER -

DARK MATTER ANNIHILATION and DECAY PROFILES for the RETICULUM II DWARF SPHEROIDAL GALAXY

Abstract

Keywords

ASJC Scopus subject areas

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