Gemini and Chandra Observations of Abell 586, A Relaxed Strong-lensing Cluster

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 Chand...

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Bibliographic Details
Published in:The Astrophysical journal 2005-09, Vol.630 (1), p.38-49
Main Authors: Cypriano, E. S, Lima Neto, G. B, Sodré, Jr., L, Kneib, J.-P, Campusano, L. E
Format: Article
Language:English
Subjects:
Astrophysics
Cosmology and Extra-Galactic Astrophysics
Physics
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Summary: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 Chandra space telescope. Employing different techniques - velocity distribution of galaxies, weak gravitational lensing, and spatially resolved X-ray 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 km s super(-1). 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 64 Gyr ago.
ISSN:0004-637X
1538-4357
DOI:10.1086/430661