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Creation of cosmic structure in the complex galaxy cluster merger Abell 2744

Merten, J. and Coe, D. and Dupke, R. and Massey, R. and Zitrin, A. and Cypriano, E. S. and Okabe, N. and Frye, B. and Braglia, F. G. and Jiménez-Teja, Y. and Benítez, N. and Broadhurst, T. and Rhodes, J. and Meneghetti, M. and Moustakas, L. A. and Sodré, L., Jr. and Krick, J. and Bregman, J. N. (2011) Creation of cosmic structure in the complex galaxy cluster merger Abell 2744. Monthly Notices of the Royal Astronomical Society, 417 (1). pp. 333-347. ISSN 0035-8711.

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We present a detailed strong-lensing, weak-lensing and X-ray analysis of Abell 2744 (z= 0.308), one of the most actively merging galaxy clusters known. It appears to have unleashed 'dark', 'ghost', 'bullet' and 'stripped' substructures, each ~10^(14) M_⊙. The phenomenology is complex and will present a challenge for numerical simulations to reproduce. With new, multiband Hubble Space Telescope (HST) imaging, we identify 34 strongly lensed images of 11 galaxies around the massive Southern ‘core’. Combining this with weak-lensing data from HST, VLT and Subaru, we produce the most detailed mass map of this cluster to date. We also perform an independent analysis of archival Chandra X-ray imaging. Our analyses support a recent claim that the Southern core and Northwestern substructure are post-merger and exhibit morphology similar to the Bullet Cluster viewed from an angle. From the separation between X-ray emitting gas and lensing mass in the Southern core, we derive a new and independent constraint on the self-interaction cross-section of dark matter particles σ/m < 3 ± 1 cm^2 g^(−1). In the Northwestern substructure, the gas, dark matter and galaxy components have become separated by much larger distances. Most curiously, the ‘ghost’ clump (primarily gas) leads the ‘dark’ clump (primarily dark matter) by more than 150 kpc. We propose an enhanced ‘ram-pressure slingshot’ scenario which may have yielded this reversal of components with such a large separation, but needs further confirmation by follow-up observations and numerical simulations. A secondary merger involves a second ‘bullet’ clump in the North and an extremely ‘stripped’ clump to the West. The latter appears to exhibit the largest separation between dark matter and X-ray emitting baryons detected to date in our sky.

Item Type:Article
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URLURL TypeDescription DOIArticle
Coe, D.0000-0001-7410-7669
Zitrin, A.0000-0002-0350-4488
Additional Information:© 2011 The Authors. Monthly Notices of the Royal Astronomical Society © 2011 RAS. Accepted 2011 June 15. Received 2011 June 14; in original form 2011 March 15. Article first published online: 19 Sep. 2011. The authors thank Matt Owers, Catherine Grant and Matthias Bartelmann for useful discussions. We are particularly grateful to Douglas Clowe, the referee of this work, for his thorough reading of the manuscript. His competent comments and suggestions improved the quality of this work substantially. JM acknowledges financial support from the Heidelberg Graduate School of Fundamental Physics (HGSFP) and by contract research Galaxy Clusters of the Baden-Würrtemberg Stiftung. All runtime-expensive calculations were performed on dedicated GPU-machines at the Osservatorio Astronomico di Bologna. DC and RD acknowledge partial financial support from grant HST-GO-11689.09-A. RD also acknowledges support from NASA Grant NNH10CD19C. RM is supported by STFCA dvanced Fellowship #PP/E006450/1 and ERC grant MIRG-CT-208994. ESC and LSJ acknowledge support from FAPESP (process ID 2009/07154) and CNPq. NB and YJ-T acknowledge support from the Spanish MICINN grant AYA2010- 22111-C03-00 and from the Junta de Andalucía Proyecto de Excelencia NBL2003. MM and JM acknowledge financial support from ASI (contracts I/064/08/0, I/009/10/0 and EUCLID-IC) and from PRIN INAF 2009. This research was carried out in part at the Jet Propulsion Laboratory, California Institute of Technology, under a contract with NASA.
Group:Infrared Processing and Analysis Center (IPAC)
Funding AgencyGrant Number
Heidelberg Graduate School of Fundamental PhysicsUNSPECIFIED
Baden-Würrtemberg StiftungUNSPECIFIED
Science and Technology Facilities Council (STFC)PP/E006450/1
European Research Council (ERC)MIRG-CT-208994
Fundacao de Amparo a Pesquisa do Estado de Sao Paulo (FAPESP)2009/07154-8
Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)UNSPECIFIED
Ministerio de Ciencia e Innovación (MCINN)AYA2010-22111-C03-00
Junta de AnaducíaNBL2003
Agenzia Spaziale Italiana (ASI)I/064/08/0
Agenzia Spaziale Italiana (ASI)I/009/10/0
Agenzia Spaziale Italiana (ASI)EUCLID-IC
Istituto Nazionale di Astrofisica (INAF)2009
Subject Keywords: gravitational lensing: strong; gravitational lensing: weak; galaxies: clusters: individual: Abell 2744; dark matter; large-scale structure of Universe; X-rays: individual: Abell 2744
Record Number:CaltechAUTHORS:20111121-114922577
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Official Citation:Merten, J., Coe, D., Dupke, R., Massey, R., Zitrin, A., Cypriano, E. S., Okabe, N., Frye, B., Braglia, F. G., Jiménez-Teja, Y., Benítez, N., Broadhurst, T., Rhodes, J., Meneghetti, M., Moustakas, L. A., Sodré Jr, L., Krick, J. and Bregman, J. N. (2011), Creation of cosmic structure in the complex galaxy cluster merger Abell 2744. Monthly Notices of the Royal Astronomical Society, 417: 333–347. doi: 10.1111/j.1365-2966.2011.19266.x
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:27894
Deposited By: Ruth Sustaita
Deposited On:22 Nov 2011 15:58
Last Modified:27 Mar 2019 20:13

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