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Creation of cosmic structure in the complex galaxy cluster merger Abell 2744 | | J. Merten
; D. Coe
; R. Dupke
; R. Massey
; A. Zitrin
; E.S. Cypriano
; N. Okabe
; B. Frye
; F. Braglia
; Y. Jimenez-Teja
; N. Benitez
; T. Broadhurst
; J. Rhodes
; M. Meneghetti
; L.A. Moustakas
; L. Sodre Jr.
; J. Krick
; J.N. Bregman
; | | Date: |
14 Mar 2011 | | Abstract: | 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.
We dub the system Pandora’s Cluster, because it appears to have unleashed
’dark’, ’ghost’, ’bullet’ and ’stripped’ substructures, each ~10^14 solar
masses. The phenomenology is complex and will present a challenge for numerical
simulations to reproduce. With new, multiband 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 sigma/m <~ 3 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 nearly 500 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. | | Source: | arXiv, 1103.2772 | | Services: | Forum | Review | PDF | Favorites | |
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