Browsing by Author "Santana, R."
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Item The Distribution of Dark and Luminous Matter in the Unique Galaxy Cluster Merger Abell 2146(Oxford University Press) King, Lindsay J.; Clowe, D. I.; Coleman, Joseph E.; Russell, H. R.; Santana, R.; White, Jacob A.; Canning, R. E. A.; Deering, Nicole J.; Fabian, A. C.; Lee, Brandyn E.; Li, B.; McNamara, B. R.; 0000 0001 2437 3571 (King, LJ); 0000-0001-8445-0444 (White, JA); King, Lindsay J.; Clowe, D. I.; Coleman, Joseph E.; Russell, H. R.; Santana, R.; White, Jacob A.; Canning, R. E. A.; Deering, Nicole J.; Fabian, A. C.; Lee, Brandyn E.; Li, B.; McNamara, B. R.Abell 2146 (z = 0.232) consists of two galaxy clusters undergoing a major merger. The system was discovered in previous work, where two large shock fronts were detected using the Chandra X-ray Observatory, consistent with a merger close to the plane of the sky, caught soon after first core passage. A weak gravitational lensing analysis of the total gravitating mass in the system, using the distorted shapes of distant galaxies seen with Advanced Camera for Surveys - Wide Field Channel on Hubble Space Telescope, is presented. The highest peak in the reconstruction of the projected mass is centred on the brightest cluster galaxy (BCG) in Abell 2146-A. The mass associated with Abell 2146-B is more extended. Bootstrapped noise mass reconstructions show the mass peak in Abell 2146-A to be consistently centred on the BCG. Previous work showed that BCG-A appears to lag behind an X-ray cool core; although the peak of the mass reconstruction is centred on the BCG, it is also consistent with the X-ray peak given the resolution of the weak lensing mass map. The best-fitting mass model with two components centred on the BCGs yields M200 = 1.1_{-0.4}^{+0.3} × 10¹⁵ and 3_{-2}^{+1} × 10¹⁴ M_⊙ for Abell 2146-A and Abell 2146-B, respectively, assuming a mass concentration parameter of c = 3.5 for each cluster. From the weak lensing analysis, Abell 2146-A is the primary halo component, and the origin of the apparent discrepancy with the X-ray analysis where Abell 2146-B is the primary halo is being assessed using simulations of the merger.