ar X iv : a st ro - p h / 05 04 03 6 v 1 1 A pr 2 00 5 Gemini and Chandra observations of Abell 586 , a relaxed strong - lensing cluster
نویسنده
چکیده
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 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 km s. 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 ∼ 4 Gyr ago. Subject headings: galaxies: clusters: individual: Abell 586 – X-rays: galaxies: clusters – gravitational lensing – cosmology: observations – dark matter
منابع مشابه
ar X iv : a st ro - p h / 05 04 03 6 v 2 4 A pr 2 00 5 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 Chandra space telescope. Employing different techniques – velocity distribution of galaxies, weak grav...
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