Gemini and Chandra observations of Abell 586, a relaxed strong-lensing cluster

Details Gemini and Chandra observations of Abell 586, a relaxed strong-lensing cluster Gemini and Chandra observations of Abell 586, a relaxed strong-lensing cluster

2005-04-01

arxiv.org/abs/astro-ph/0504036v2

Astrophys.J. 630 (2005) 38-49

Astronomy and Astrophysics

Astrophysics

ApJ accepted, 20 pages, 11 figures; Figure 1 fixed

Scientific paper

10.1086/430661

We analyze the mass content of the massive strong-lensing cluster Abell 586 ($z = 0.17$). We use optical data (imaging and spectroscopy) obtained with the Gemini Multi-Object Spectrograph (GMOS) mounted on the 8-m Gemini-North telescope, together with publicly available X-ray data taken with the \textit{Chandra} space telescope. Employing different techniques -- velocity distribution of galaxies, weak gravitational lensing, and X-ray spatially resolved spectroscopy -- we derive mass and velocity dispersion estimates from each of them. All estimates agree well with each other, within a 68% confidence level, indicating a velocity dispersion of 1000 -- 1250 \kms. The projected mass distributions obtained through weak-lensing and X-ray emission are strikingly similar, having nearly circular geometry. We suggest that Abell 586 is probably a truly relaxed cluster, whose last major merger occurred more than $\sim 4$ Gyr ago

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