The dynamical state of RX J1347.5−1145 from a combined strong lensing and X-ray analysis |
| |
| Authors: | M Miranda M Sereno E De Filippis M Paolillo |
| |
| Institution: | Institute for Theoretical Physics, University of Zürich, Winterthurerstrasse 190, CH-8057 Zürich, Switzerland;INAF –Italian National Institute of Astrophysics, via del Parco Mellini, Rome, Italy;Dipartimento di Scienze Fisiche, Universitàdi Napoli, Via Cinthia, 80126 Napoli, Italy;INFN –Napoli Unit, Via Cinthia, 80126 Napoli, Italy |
| |
| Abstract: | 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 Very Large Telescope (VLT) and new Hubble Space Telescope ( HST ) data, strongly argues in favour 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 ± 0.3) × 1014 M⊙ h ?1 within a radius of 360 kpc h ?1 (1.5 arcmin). 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 subclump. 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 subclumps is consistent with both our lensing and X-ray analyses, and can explain previous discrepancies with mass estimates based on the virial theorem. |
| |
| Keywords: | gravitational lensing galaxies: clusters: general galaxies: clusters: individual: RX J1347 5?1145 X-rays: galaxies: clusters |
|
|
