2018/10/29 by M. B. Pandge, R. Monteiro-Oliveira, J. Bagchi +3 · 1 voice
Physics and Astronomy · #astro-ph.CO #astro-ph.GA
paper · pdf · doi:10.1093/mnras/sty2937
14 pages, 11 figures, Accepted for publication in MNRAS
arxiv published 2018/10/29 · arxiv created 2018/11/01 · arxiv updated 2018/11/07
We present a comprehensive multi-wavelength analysis of the merging galaxy cluster MACS~J0417.5-1154 at a redshift of z=0.44, using available images red obtained with \chandra in X-ray, \it Subaru, \it Hubble Space Telescope (HST) in optical, \it Giant Metrewave Radio Telescope (GMRT) in radio and \it Bolocam at 2.1~mm wavelength. This is an example of a complex merging galaxy cluster also hosting a steep-spectrum Mpc scale radio halo. The mass distribution obtained by weak lensing reconstruction shows that MACS~J0417.5-1154 belongs to the dissociative class of mergers, where one of its substructures has had its gas content detached after the pericentric passage. We find the main cluster mass M200~=~11.5+3.0-3.5 × 1014 M_\odot and the smaller second (sub)cluster mass to be M200~=~1.96+1.60-0.95 × 1014 M_\odot, leading to a large total mass of M200~=~13.8+2.6-2.8 × 1014 M_\odot. The overall structure, surface brightness profile, temperature and metal abundance of the intra-cluster medium (ICM) all point towards the presence of a cold front and merger induced gas-sloshing motion near the core. We detect a surface brightness edge to the south-east direction at a projected distance of ∼45 arcsec (∼255 kpc) from the centre of this cluster. The X-ray spectral analysis across the inner and outer edge allows us to confirm the detected edge as a cold front. The GMRT 235 MHz observation shows a comet-like extended sychrotron radio halo emission trailing behind the cold front. The peak of the Sunyaev-Zel'dovich decrement is found displaced from the centre of X-ray emission, which is interpreted as consequence of the merger dynamics.