Hunting for the Dark Matter Wake Induced by the Large Magellanic Cloud

Nicolas Garavito-Camargo, Gurtina Besla, Chervin F.P. Laporte, Kathryn V. Johnston, Facundo A. Gómez, Laura L. Watkins

Research output: Contribution to journalArticle

Abstract

Satellite galaxies are predicted to generate gravitational density wakes as they orbit within the dark matter (DM) halos of their hosts, causing their orbits to decay over time. The recent infall of the Milky Way's (MW) most massive satellite galaxy, the Large Magellanic Cloud (LMC), affords us the unique opportunity to study this process in action. In this work, we present high-resolution (m dm = 4 × 104 M o˙) N-body simulations of the MW-LMC interaction over the past 2 Gyr. We quantify the impact of the LMC's passage on the density and kinematics of the MW's DM halo and the observability of these structures in the MW's stellar halo. The LMC is found to generate a pronounced wake, which we decompose in Transient and Collective responses, in both the DM and stellar halos. The wake leads to overdensities and distinct kinematic patterns that should be observable with ongoing and future surveys. Specifically, the Collective response will result in redshifted radial velocities of stars in the north and blueshifts in the south, at distances >45 kpc. The Transient response traces the orbital path of the LMC through the halo (50-200 kpc), resulting in a stellar overdensity with a distinct, tangential kinematic pattern that persists to the present day. The detection of the MW's halo response will constrain the infall mass of the LMC, its orbital trajectory, and the mass of the MW, and it may inform us about the nature of the DM particle itself.

Original languageEnglish (US)
Article number51
JournalAstrophysical Journal
Volume884
Issue number1
DOIs
StatePublished - Oct 10 2019

Fingerprint

Magellanic clouds
wakes
hunting
halos
dark matter
kinematics
transient response
galaxies
orbits
orbitals
trajectory
radial velocity
trajectories
simulation
stars
high resolution
decay
interactions

Keywords

  • Galaxy: Kinematics and dynamics

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

Cite this

Garavito-Camargo, N., Besla, G., Laporte, C. F. P., Johnston, K. V., Gómez, F. A., & Watkins, L. L. (2019). Hunting for the Dark Matter Wake Induced by the Large Magellanic Cloud. Astrophysical Journal, 884(1), [51]. https://doi.org/10.3847/1538-4357/ab32eb

Hunting for the Dark Matter Wake Induced by the Large Magellanic Cloud. / Garavito-Camargo, Nicolas; Besla, Gurtina; Laporte, Chervin F.P.; Johnston, Kathryn V.; Gómez, Facundo A.; Watkins, Laura L.

In: Astrophysical Journal, Vol. 884, No. 1, 51, 10.10.2019.

Research output: Contribution to journalArticle

Garavito-Camargo, N, Besla, G, Laporte, CFP, Johnston, KV, Gómez, FA & Watkins, LL 2019, 'Hunting for the Dark Matter Wake Induced by the Large Magellanic Cloud', Astrophysical Journal, vol. 884, no. 1, 51. https://doi.org/10.3847/1538-4357/ab32eb
Garavito-Camargo N, Besla G, Laporte CFP, Johnston KV, Gómez FA, Watkins LL. Hunting for the Dark Matter Wake Induced by the Large Magellanic Cloud. Astrophysical Journal. 2019 Oct 10;884(1). 51. https://doi.org/10.3847/1538-4357/ab32eb
Garavito-Camargo, Nicolas ; Besla, Gurtina ; Laporte, Chervin F.P. ; Johnston, Kathryn V. ; Gómez, Facundo A. ; Watkins, Laura L. / Hunting for the Dark Matter Wake Induced by the Large Magellanic Cloud. In: Astrophysical Journal. 2019 ; Vol. 884, No. 1.
@article{9846ab0ec4c1437681b5eba7d171f717,
title = "Hunting for the Dark Matter Wake Induced by the Large Magellanic Cloud",
abstract = "Satellite galaxies are predicted to generate gravitational density wakes as they orbit within the dark matter (DM) halos of their hosts, causing their orbits to decay over time. The recent infall of the Milky Way's (MW) most massive satellite galaxy, the Large Magellanic Cloud (LMC), affords us the unique opportunity to study this process in action. In this work, we present high-resolution (m dm = 4 × 104 M o˙) N-body simulations of the MW-LMC interaction over the past 2 Gyr. We quantify the impact of the LMC's passage on the density and kinematics of the MW's DM halo and the observability of these structures in the MW's stellar halo. The LMC is found to generate a pronounced wake, which we decompose in Transient and Collective responses, in both the DM and stellar halos. The wake leads to overdensities and distinct kinematic patterns that should be observable with ongoing and future surveys. Specifically, the Collective response will result in redshifted radial velocities of stars in the north and blueshifts in the south, at distances >45 kpc. The Transient response traces the orbital path of the LMC through the halo (50-200 kpc), resulting in a stellar overdensity with a distinct, tangential kinematic pattern that persists to the present day. The detection of the MW's halo response will constrain the infall mass of the LMC, its orbital trajectory, and the mass of the MW, and it may inform us about the nature of the DM particle itself.",
keywords = "Galaxy: Kinematics and dynamics",
author = "Nicolas Garavito-Camargo and Gurtina Besla and Laporte, {Chervin F.P.} and Johnston, {Kathryn V.} and G{\'o}mez, {Facundo A.} and Watkins, {Laura L.}",
year = "2019",
month = "10",
day = "10",
doi = "10.3847/1538-4357/ab32eb",
language = "English (US)",
volume = "884",
journal = "Astrophysical Journal",
issn = "0004-637X",
publisher = "IOP Publishing Ltd.",
number = "1",

}

TY - JOUR

T1 - Hunting for the Dark Matter Wake Induced by the Large Magellanic Cloud

AU - Garavito-Camargo, Nicolas

AU - Besla, Gurtina

AU - Laporte, Chervin F.P.

AU - Johnston, Kathryn V.

AU - Gómez, Facundo A.

AU - Watkins, Laura L.

PY - 2019/10/10

Y1 - 2019/10/10

N2 - Satellite galaxies are predicted to generate gravitational density wakes as they orbit within the dark matter (DM) halos of their hosts, causing their orbits to decay over time. The recent infall of the Milky Way's (MW) most massive satellite galaxy, the Large Magellanic Cloud (LMC), affords us the unique opportunity to study this process in action. In this work, we present high-resolution (m dm = 4 × 104 M o˙) N-body simulations of the MW-LMC interaction over the past 2 Gyr. We quantify the impact of the LMC's passage on the density and kinematics of the MW's DM halo and the observability of these structures in the MW's stellar halo. The LMC is found to generate a pronounced wake, which we decompose in Transient and Collective responses, in both the DM and stellar halos. The wake leads to overdensities and distinct kinematic patterns that should be observable with ongoing and future surveys. Specifically, the Collective response will result in redshifted radial velocities of stars in the north and blueshifts in the south, at distances >45 kpc. The Transient response traces the orbital path of the LMC through the halo (50-200 kpc), resulting in a stellar overdensity with a distinct, tangential kinematic pattern that persists to the present day. The detection of the MW's halo response will constrain the infall mass of the LMC, its orbital trajectory, and the mass of the MW, and it may inform us about the nature of the DM particle itself.

AB - Satellite galaxies are predicted to generate gravitational density wakes as they orbit within the dark matter (DM) halos of their hosts, causing their orbits to decay over time. The recent infall of the Milky Way's (MW) most massive satellite galaxy, the Large Magellanic Cloud (LMC), affords us the unique opportunity to study this process in action. In this work, we present high-resolution (m dm = 4 × 104 M o˙) N-body simulations of the MW-LMC interaction over the past 2 Gyr. We quantify the impact of the LMC's passage on the density and kinematics of the MW's DM halo and the observability of these structures in the MW's stellar halo. The LMC is found to generate a pronounced wake, which we decompose in Transient and Collective responses, in both the DM and stellar halos. The wake leads to overdensities and distinct kinematic patterns that should be observable with ongoing and future surveys. Specifically, the Collective response will result in redshifted radial velocities of stars in the north and blueshifts in the south, at distances >45 kpc. The Transient response traces the orbital path of the LMC through the halo (50-200 kpc), resulting in a stellar overdensity with a distinct, tangential kinematic pattern that persists to the present day. The detection of the MW's halo response will constrain the infall mass of the LMC, its orbital trajectory, and the mass of the MW, and it may inform us about the nature of the DM particle itself.

KW - Galaxy: Kinematics and dynamics

UR - http://www.scopus.com/inward/record.url?scp=85073758405&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=85073758405&partnerID=8YFLogxK

U2 - 10.3847/1538-4357/ab32eb

DO - 10.3847/1538-4357/ab32eb

M3 - Article

AN - SCOPUS:85073758405

VL - 884

JO - Astrophysical Journal

JF - Astrophysical Journal

SN - 0004-637X

IS - 1

M1 - 51

ER -