Spectroscopic confirmation of a cluster of galaxies at z=1 in the field of the gravitational lens MG2016+112

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dc.creatorSoucail, G.
dc.creatorKneib, J. P.
dc.creatorJaunsen, A. O.
dc.creatorHjorth, J.
dc.creatorHattori, M.
dc.creatorYamada, T.
dc.date2000-06-27
dc.date2000-12-19
dc.date.accessioned2026-07-07T01:54:09Z
dc.date.available2026-07-07T01:54:09Z
dc.descriptionWe present new optical data on the cluster AX J2019+1127 identified by the X-ray satellite ASCA at z\sim 1 (Hattori et al. 1997). The data suggest the presence of a high-redshift cluster of galaxies responsible for the large separation triple quasar MG2016+112. Our deep photometry reveals an excess of z\sim 1 galaxy candidates, as already suspected by Benitez et al. (1999). Our spectroscopic survey of 44 objects in the field shows an excess of 6 red galaxies securely identified at z \sim 1, with a mean redshift of z =1.005 +/- 0.002. We estimate a velocity dispersion of σ= 771 (+430/-160) km s(-1) based on these 6 galaxies and a V-band mass-to-light ratio of 215 (+308/-77) h_50 M/L_sol. Our observations thus confirm the existence of a massive structure acting as the lens, which explains the unusual configuration of the triple quasar. Hence, there is no more need to invoke the existence of a ``dark cluster'' to understand this lens system.
dc.description8 pages, 4 figures, uses aa.cls, accepted to Astronomy and Astrophysics with minor changes
dc.identifierhttps://arxiv.org/abs/astro-ph/0006382
dc.identifierhttp://arxiv.org/abs/astro-ph/0006382
dc.identifierAstron.Astrophys. 367 (2001) 741-747
dc.identifierdoi:10.1051/0004-6361:20000498
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/1235
dc.subjectAstrophysics
dc.titleSpectroscopic confirmation of a cluster of galaxies at z=1 in the field of the gravitational lens MG2016+112
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