Astronomy and Astrophysics – Astrophysics
Scientific paper
2008-01-09
Astronomy and Astrophysics
Astrophysics
9 pages, 7 figures, accepted for publication in MNRAS. High resolution version at http://www-theorie.physik.unizh.ch/~solar/
Scientific paper
10.1111/j.1365-2966.2008.12855.x
We perform a combined X-ray and strong lensing analysis of RX J1347.5-1145, one of the most luminous galaxy clusters at X-ray wavelengths. We show that evidence from strong lensing alone, based on published VLT and new HST data, strongly argues in favor of a complex structure. The analysis takes into account arc positions, shapes and orientations and is done thoroughly in the image plane. The cluster inner regions are well fitted by a bimodal mass distribution, with a total projected mass of $M_{tot} = (9.9 \pm 0.3)\times 10^{14} M_\odot/h$ within a radius of $360 \mathrm{kpc}/h$ ($1.5'$). Such a complex structure could be a signature of a recent major merger as further supported by X-ray data. A temperature map of the cluster, based on deep Chandra observations, reveals a hot front located between the first main component and an X-ray emitting South Eastern sub-clump. The map also unveils a filament of cold gas in the innermost regions of the cluster, most probably a cooling wake caused by the motion of the cD inside the cool core region. A merger scenario in the plane of the sky between two dark matter sub-clumps is consistent with both our lensing and X-ray analyses, and can explain previous discrepancies with mass estimates based on the virial theorem.
de Filippis Elisabetta
Miranda Marco
Paolillo Maruizio
Sereno Mauro
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