Discovery of a ringlike dark matter structure in the core of the galaxy cluster Cl 0024+17

Myung Kook Jee, H. C. Ford, G. D. Illingworth, R. L. White, T. J. Broadhurst, D. A. Coe, G. R. Meurer, A. Van Der Wel, N. Benítez, J. P. Blakeslee, R. J. Bouwens, L. D. Bradley, R. Demarco, N. L. Homeier, A. R. Martel, S. Mei

Research output: Contribution to journalArticle

118 Citations (Scopus)

Abstract

We present a comprehensive mass reconstruction of the rich galaxy cluster Cl 0024+17 at z ≃ 0.4 from ACS data, unifying both strong- and weak-lensing constraints. The weak-lensing signal from a dense distribution of background galaxies (∼ 120 arcmin-2) across the cluster enables the derivation of a high-resolution parameter-free mass map. The strongly lensed objects tightly constrain the mass structure of the cluster inner region on an absolute scale, breaking the mass-sheet degeneracy. The mass reconstruction of Cl 0024+17 obtained in such a way is remarkable. It reveals a ringlike dark matter substructure at r ∼ 75″ surrounding a soft, dense core at r ≲ 50″. We interpret this peculiar substructure as the result of a high-speed line-of-sight collision of two massive clusters ∼ 1 - 2 Gyr ago. Such an event is also indicated by the cluster velocity distribution. Our numerical simulation with purely collisionless particles demonstrates that such density ripples can arise by radially expanding, decelerating particles that originally comprised the precollision cores. Cl 0024+17 can be likened to the bullet cluster 1 E 0657-56, but viewed along the collision axis at a much later epoch. In addition, we show that the long-standing mass discrepancy for Cl 0024+17 between X-ray and lensing can be resolved by treating the cluster X-ray emission as coming from a superposition of two X-ray systems. The cluster's unusual X-ray surface brightness profile that requires a two isothermal sphere description supports this hypothesis.

Original languageEnglish
Pages (from-to)728-749
Number of pages22
JournalAstrophysical Journal
Volume661
Issue number2 I
DOIs
Publication statusPublished - 2007 Jun 1

Fingerprint

dark matter
galaxies
collision
substructures
x rays
ripple
collisions
ripples
line of sight
brightness
derivation
velocity distribution
time measurement
high speed
simulation
high resolution
profiles
distribution
particle

All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics
  • Space and Planetary Science

Cite this

Jee, M. K., Ford, H. C., Illingworth, G. D., White, R. L., Broadhurst, T. J., Coe, D. A., ... Mei, S. (2007). Discovery of a ringlike dark matter structure in the core of the galaxy cluster Cl 0024+17. Astrophysical Journal, 661(2 I), 728-749. https://doi.org/10.1086/517498
Jee, Myung Kook ; Ford, H. C. ; Illingworth, G. D. ; White, R. L. ; Broadhurst, T. J. ; Coe, D. A. ; Meurer, G. R. ; Van Der Wel, A. ; Benítez, N. ; Blakeslee, J. P. ; Bouwens, R. J. ; Bradley, L. D. ; Demarco, R. ; Homeier, N. L. ; Martel, A. R. ; Mei, S. / Discovery of a ringlike dark matter structure in the core of the galaxy cluster Cl 0024+17. In: Astrophysical Journal. 2007 ; Vol. 661, No. 2 I. pp. 728-749.
@article{635ee104cb064d8e828622a58c1d89f8,
title = "Discovery of a ringlike dark matter structure in the core of the galaxy cluster Cl 0024+17",
abstract = "We present a comprehensive mass reconstruction of the rich galaxy cluster Cl 0024+17 at z ≃ 0.4 from ACS data, unifying both strong- and weak-lensing constraints. The weak-lensing signal from a dense distribution of background galaxies (∼ 120 arcmin-2) across the cluster enables the derivation of a high-resolution parameter-free mass map. The strongly lensed objects tightly constrain the mass structure of the cluster inner region on an absolute scale, breaking the mass-sheet degeneracy. The mass reconstruction of Cl 0024+17 obtained in such a way is remarkable. It reveals a ringlike dark matter substructure at r ∼ 75″ surrounding a soft, dense core at r ≲ 50″. We interpret this peculiar substructure as the result of a high-speed line-of-sight collision of two massive clusters ∼ 1 - 2 Gyr ago. Such an event is also indicated by the cluster velocity distribution. Our numerical simulation with purely collisionless particles demonstrates that such density ripples can arise by radially expanding, decelerating particles that originally comprised the precollision cores. Cl 0024+17 can be likened to the bullet cluster 1 E 0657-56, but viewed along the collision axis at a much later epoch. In addition, we show that the long-standing mass discrepancy for Cl 0024+17 between X-ray and lensing can be resolved by treating the cluster X-ray emission as coming from a superposition of two X-ray systems. The cluster's unusual X-ray surface brightness profile that requires a two isothermal sphere description supports this hypothesis.",
author = "Jee, {Myung Kook} and Ford, {H. C.} and Illingworth, {G. D.} and White, {R. L.} and Broadhurst, {T. J.} and Coe, {D. A.} and Meurer, {G. R.} and {Van Der Wel}, A. and N. Ben{\'i}tez and Blakeslee, {J. P.} and Bouwens, {R. J.} and Bradley, {L. D.} and R. Demarco and Homeier, {N. L.} and Martel, {A. R.} and S. Mei",
year = "2007",
month = "6",
day = "1",
doi = "10.1086/517498",
language = "English",
volume = "661",
pages = "728--749",
journal = "Astrophysical Journal",
issn = "0004-637X",
publisher = "IOP Publishing Ltd.",
number = "2 I",

}

Jee, MK, Ford, HC, Illingworth, GD, White, RL, Broadhurst, TJ, Coe, DA, Meurer, GR, Van Der Wel, A, Benítez, N, Blakeslee, JP, Bouwens, RJ, Bradley, LD, Demarco, R, Homeier, NL, Martel, AR & Mei, S 2007, 'Discovery of a ringlike dark matter structure in the core of the galaxy cluster Cl 0024+17', Astrophysical Journal, vol. 661, no. 2 I, pp. 728-749. https://doi.org/10.1086/517498

Discovery of a ringlike dark matter structure in the core of the galaxy cluster Cl 0024+17. / Jee, Myung Kook; Ford, H. C.; Illingworth, G. D.; White, R. L.; Broadhurst, T. J.; Coe, D. A.; Meurer, G. R.; Van Der Wel, A.; Benítez, N.; Blakeslee, J. P.; Bouwens, R. J.; Bradley, L. D.; Demarco, R.; Homeier, N. L.; Martel, A. R.; Mei, S.

In: Astrophysical Journal, Vol. 661, No. 2 I, 01.06.2007, p. 728-749.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Discovery of a ringlike dark matter structure in the core of the galaxy cluster Cl 0024+17

AU - Jee, Myung Kook

AU - Ford, H. C.

AU - Illingworth, G. D.

AU - White, R. L.

AU - Broadhurst, T. J.

AU - Coe, D. A.

AU - Meurer, G. R.

AU - Van Der Wel, A.

AU - Benítez, N.

AU - Blakeslee, J. P.

AU - Bouwens, R. J.

AU - Bradley, L. D.

AU - Demarco, R.

AU - Homeier, N. L.

AU - Martel, A. R.

AU - Mei, S.

PY - 2007/6/1

Y1 - 2007/6/1

N2 - We present a comprehensive mass reconstruction of the rich galaxy cluster Cl 0024+17 at z ≃ 0.4 from ACS data, unifying both strong- and weak-lensing constraints. The weak-lensing signal from a dense distribution of background galaxies (∼ 120 arcmin-2) across the cluster enables the derivation of a high-resolution parameter-free mass map. The strongly lensed objects tightly constrain the mass structure of the cluster inner region on an absolute scale, breaking the mass-sheet degeneracy. The mass reconstruction of Cl 0024+17 obtained in such a way is remarkable. It reveals a ringlike dark matter substructure at r ∼ 75″ surrounding a soft, dense core at r ≲ 50″. We interpret this peculiar substructure as the result of a high-speed line-of-sight collision of two massive clusters ∼ 1 - 2 Gyr ago. Such an event is also indicated by the cluster velocity distribution. Our numerical simulation with purely collisionless particles demonstrates that such density ripples can arise by radially expanding, decelerating particles that originally comprised the precollision cores. Cl 0024+17 can be likened to the bullet cluster 1 E 0657-56, but viewed along the collision axis at a much later epoch. In addition, we show that the long-standing mass discrepancy for Cl 0024+17 between X-ray and lensing can be resolved by treating the cluster X-ray emission as coming from a superposition of two X-ray systems. The cluster's unusual X-ray surface brightness profile that requires a two isothermal sphere description supports this hypothesis.

AB - We present a comprehensive mass reconstruction of the rich galaxy cluster Cl 0024+17 at z ≃ 0.4 from ACS data, unifying both strong- and weak-lensing constraints. The weak-lensing signal from a dense distribution of background galaxies (∼ 120 arcmin-2) across the cluster enables the derivation of a high-resolution parameter-free mass map. The strongly lensed objects tightly constrain the mass structure of the cluster inner region on an absolute scale, breaking the mass-sheet degeneracy. The mass reconstruction of Cl 0024+17 obtained in such a way is remarkable. It reveals a ringlike dark matter substructure at r ∼ 75″ surrounding a soft, dense core at r ≲ 50″. We interpret this peculiar substructure as the result of a high-speed line-of-sight collision of two massive clusters ∼ 1 - 2 Gyr ago. Such an event is also indicated by the cluster velocity distribution. Our numerical simulation with purely collisionless particles demonstrates that such density ripples can arise by radially expanding, decelerating particles that originally comprised the precollision cores. Cl 0024+17 can be likened to the bullet cluster 1 E 0657-56, but viewed along the collision axis at a much later epoch. In addition, we show that the long-standing mass discrepancy for Cl 0024+17 between X-ray and lensing can be resolved by treating the cluster X-ray emission as coming from a superposition of two X-ray systems. The cluster's unusual X-ray surface brightness profile that requires a two isothermal sphere description supports this hypothesis.

UR - http://www.scopus.com/inward/record.url?scp=34347206697&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=34347206697&partnerID=8YFLogxK

U2 - 10.1086/517498

DO - 10.1086/517498

M3 - Article

VL - 661

SP - 728

EP - 749

JO - Astrophysical Journal

JF - Astrophysical Journal

SN - 0004-637X

IS - 2 I

ER -

Jee MK, Ford HC, Illingworth GD, White RL, Broadhurst TJ, Coe DA et al. Discovery of a ringlike dark matter structure in the core of the galaxy cluster Cl 0024+17. Astrophysical Journal. 2007 Jun 1;661(2 I):728-749. https://doi.org/10.1086/517498