MC 2: Constraining the dark matter distribution of the violent merging galaxy cluster CIZA J2242.8+5301 by piercing through the milky way

M. James Jee, Andra Stroe, William Dawson, David Wittman, Henk Hoekstra, Marcus Brüggen, Huub Röttgering, David Sobral, Reinout J. Van Weeren

Research output: Contribution to journalArticle

32 Citations (Scopus)

Abstract

The galaxy cluster CIZA J2242.8+5301 at z = 0.19 is a merging system with a prominent (2 Mpc long) radio relic, which together with the morphology of the X-ray emission provides strong evidence for a violent collision along the north-south axis. We present our constraints on the dark matter distribution of this unusual system using Subaru and Canada-France-Hawaii Telescope imaging data. Measuring a high signal-to-noise ratio lensing signal from this cluster is potentially a challenging task because of its proximity to the Milky Way plane (|b| 5°). We overcome this challenge with careful observation planning and systematics control, which enables us to successfully map the dark matter distribution of the cluster with high fidelity. The resulting mass map shows that the mass distribution of CIZA J2242.8+5301 is highly elongated along the north-south merger axis inferred from the orientation of the radio relics. Based on our mass reconstruction, we identify two sub-clusters, which coincide with the cluster galaxy distributions. We determine their masses using Markov Chain Monte Carlo analysis by simultaneously fitting two Navarro-Frenk-White halos without fixing their centroids. The resulting masses of the northern and southern systems are and , respectively, indicating that we are witnessing a post-collision of two giant systems of nearly equal mass. When the mass and galaxy centroids are compared in detail, we detect 1′ (190 kpc) offsets in both northern and southern sub-clusters. After investigating the statistical significance of the offsets by bootstrapping both mass and galaxy centroids, we find that the galaxy luminosity-mass offset for the northern clump is statistically significant at the ≳ 2σ level whereas the detection is only marginal for the southern sub-cluster in part because of a relatively large mass centroid error. We conclude that it is yet premature to uniquely attribute the galaxy-mass misalignment to self-interaction of dark matter and discuss caveats.

Original languageEnglish
Article number46
JournalAstrophysical Journal
Volume802
Issue number1
DOIs
Publication statusPublished - 2015 Mar 20

Fingerprint

piercing
dark matter
galaxies
centroids
distribution
collision
radio
collisions
Monte Carlo analysis
Markov chains
bootstrapping
clumps
mass distribution
France
Canada
Markov chain
misalignment
fixing
planning
proximity

All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics
  • Space and Planetary Science

Cite this

Jee, M. James ; Stroe, Andra ; Dawson, William ; Wittman, David ; Hoekstra, Henk ; Brüggen, Marcus ; Röttgering, Huub ; Sobral, David ; Van Weeren, Reinout J. / MC 2 : Constraining the dark matter distribution of the violent merging galaxy cluster CIZA J2242.8+5301 by piercing through the milky way. In: Astrophysical Journal. 2015 ; Vol. 802, No. 1.
@article{50c2c5ac8be6416e9f03ad92af8559a0,
title = "MC 2: Constraining the dark matter distribution of the violent merging galaxy cluster CIZA J2242.8+5301 by piercing through the milky way",
abstract = "The galaxy cluster CIZA J2242.8+5301 at z = 0.19 is a merging system with a prominent (2 Mpc long) radio relic, which together with the morphology of the X-ray emission provides strong evidence for a violent collision along the north-south axis. We present our constraints on the dark matter distribution of this unusual system using Subaru and Canada-France-Hawaii Telescope imaging data. Measuring a high signal-to-noise ratio lensing signal from this cluster is potentially a challenging task because of its proximity to the Milky Way plane (|b| 5°). We overcome this challenge with careful observation planning and systematics control, which enables us to successfully map the dark matter distribution of the cluster with high fidelity. The resulting mass map shows that the mass distribution of CIZA J2242.8+5301 is highly elongated along the north-south merger axis inferred from the orientation of the radio relics. Based on our mass reconstruction, we identify two sub-clusters, which coincide with the cluster galaxy distributions. We determine their masses using Markov Chain Monte Carlo analysis by simultaneously fitting two Navarro-Frenk-White halos without fixing their centroids. The resulting masses of the northern and southern systems are and , respectively, indicating that we are witnessing a post-collision of two giant systems of nearly equal mass. When the mass and galaxy centroids are compared in detail, we detect 1′ (190 kpc) offsets in both northern and southern sub-clusters. After investigating the statistical significance of the offsets by bootstrapping both mass and galaxy centroids, we find that the galaxy luminosity-mass offset for the northern clump is statistically significant at the ≳ 2σ level whereas the detection is only marginal for the southern sub-cluster in part because of a relatively large mass centroid error. We conclude that it is yet premature to uniquely attribute the galaxy-mass misalignment to self-interaction of dark matter and discuss caveats.",
author = "Jee, {M. James} and Andra Stroe and William Dawson and David Wittman and Henk Hoekstra and Marcus Br{\"u}ggen and Huub R{\"o}ttgering and David Sobral and {Van Weeren}, {Reinout J.}",
year = "2015",
month = "3",
day = "20",
doi = "10.1088/0004-637X/802/1/46",
language = "English",
volume = "802",
journal = "Astrophysical Journal",
issn = "0004-637X",
publisher = "IOP Publishing Ltd.",
number = "1",

}

MC 2 : Constraining the dark matter distribution of the violent merging galaxy cluster CIZA J2242.8+5301 by piercing through the milky way. / Jee, M. James; Stroe, Andra; Dawson, William; Wittman, David; Hoekstra, Henk; Brüggen, Marcus; Röttgering, Huub; Sobral, David; Van Weeren, Reinout J.

In: Astrophysical Journal, Vol. 802, No. 1, 46, 20.03.2015.

Research output: Contribution to journalArticle

TY - JOUR

T1 - MC 2

T2 - Constraining the dark matter distribution of the violent merging galaxy cluster CIZA J2242.8+5301 by piercing through the milky way

AU - Jee, M. James

AU - Stroe, Andra

AU - Dawson, William

AU - Wittman, David

AU - Hoekstra, Henk

AU - Brüggen, Marcus

AU - Röttgering, Huub

AU - Sobral, David

AU - Van Weeren, Reinout J.

PY - 2015/3/20

Y1 - 2015/3/20

N2 - The galaxy cluster CIZA J2242.8+5301 at z = 0.19 is a merging system with a prominent (2 Mpc long) radio relic, which together with the morphology of the X-ray emission provides strong evidence for a violent collision along the north-south axis. We present our constraints on the dark matter distribution of this unusual system using Subaru and Canada-France-Hawaii Telescope imaging data. Measuring a high signal-to-noise ratio lensing signal from this cluster is potentially a challenging task because of its proximity to the Milky Way plane (|b| 5°). We overcome this challenge with careful observation planning and systematics control, which enables us to successfully map the dark matter distribution of the cluster with high fidelity. The resulting mass map shows that the mass distribution of CIZA J2242.8+5301 is highly elongated along the north-south merger axis inferred from the orientation of the radio relics. Based on our mass reconstruction, we identify two sub-clusters, which coincide with the cluster galaxy distributions. We determine their masses using Markov Chain Monte Carlo analysis by simultaneously fitting two Navarro-Frenk-White halos without fixing their centroids. The resulting masses of the northern and southern systems are and , respectively, indicating that we are witnessing a post-collision of two giant systems of nearly equal mass. When the mass and galaxy centroids are compared in detail, we detect 1′ (190 kpc) offsets in both northern and southern sub-clusters. After investigating the statistical significance of the offsets by bootstrapping both mass and galaxy centroids, we find that the galaxy luminosity-mass offset for the northern clump is statistically significant at the ≳ 2σ level whereas the detection is only marginal for the southern sub-cluster in part because of a relatively large mass centroid error. We conclude that it is yet premature to uniquely attribute the galaxy-mass misalignment to self-interaction of dark matter and discuss caveats.

AB - The galaxy cluster CIZA J2242.8+5301 at z = 0.19 is a merging system with a prominent (2 Mpc long) radio relic, which together with the morphology of the X-ray emission provides strong evidence for a violent collision along the north-south axis. We present our constraints on the dark matter distribution of this unusual system using Subaru and Canada-France-Hawaii Telescope imaging data. Measuring a high signal-to-noise ratio lensing signal from this cluster is potentially a challenging task because of its proximity to the Milky Way plane (|b| 5°). We overcome this challenge with careful observation planning and systematics control, which enables us to successfully map the dark matter distribution of the cluster with high fidelity. The resulting mass map shows that the mass distribution of CIZA J2242.8+5301 is highly elongated along the north-south merger axis inferred from the orientation of the radio relics. Based on our mass reconstruction, we identify two sub-clusters, which coincide with the cluster galaxy distributions. We determine their masses using Markov Chain Monte Carlo analysis by simultaneously fitting two Navarro-Frenk-White halos without fixing their centroids. The resulting masses of the northern and southern systems are and , respectively, indicating that we are witnessing a post-collision of two giant systems of nearly equal mass. When the mass and galaxy centroids are compared in detail, we detect 1′ (190 kpc) offsets in both northern and southern sub-clusters. After investigating the statistical significance of the offsets by bootstrapping both mass and galaxy centroids, we find that the galaxy luminosity-mass offset for the northern clump is statistically significant at the ≳ 2σ level whereas the detection is only marginal for the southern sub-cluster in part because of a relatively large mass centroid error. We conclude that it is yet premature to uniquely attribute the galaxy-mass misalignment to self-interaction of dark matter and discuss caveats.

UR - http://www.scopus.com/inward/record.url?scp=84925705104&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=84925705104&partnerID=8YFLogxK

U2 - 10.1088/0004-637X/802/1/46

DO - 10.1088/0004-637X/802/1/46

M3 - Article

AN - SCOPUS:84925705104

VL - 802

JO - Astrophysical Journal

JF - Astrophysical Journal

SN - 0004-637X

IS - 1

M1 - 46

ER -