A search for clusters at high redshift - II. A proto cluster around a radio galaxy at z=2.16

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dc.creatorPentericci, L.
dc.creatorKurk, J. D.
dc.creatorRottgering, H. J. A
dc.creatorMiley, G. K.
dc.creatorvan Breugel, W.
dc.creatorCarilli, C. L.
dc.creatorFord, H.
dc.creatorHeckman, T.
dc.creatorMcCarthy, P.
dc.creatorMoorwood, A.
dc.date2000-08-09
dc.date.accessioned2026-07-07T01:54:52Z
dc.date.available2026-07-07T01:54:52Z
dc.descriptionVLT spectroscopic observations of Ly alpha--excess objects in the field of the clumpy radio galaxy 1138-262 at z=2.16 have led to the discovery of 14 galaxies and one QSO at approximately the same distance as the radio galaxy. All galaxies have redshifts in the range 2.16 \pm 0.02, centered around the redshift of the radio galaxy, and are within a projected physical distance of 1.5 Mpc from it. The velocity distribution suggests that there are two galaxy subgroups having velocity dispersions of ~500 km/s and ~300 km/s and a relative velocity of 1800 km/s. If these are virialized structures, the estimated dynamical masses for the subgroups are ~9 and ~3x10E13 solar masses respectively, implying a total mass for the structure of more than 10E14 solar masses. The new observations, together with previous results, suggest that the structure of galaxies around 1138-262 is likely to be a forming cluster.
dc.descriptionAccepted for publication in A&A Letters, 5 pages, 3 figures
dc.identifierhttps://arxiv.org/abs/astro-ph/0008143
dc.identifierhttp://arxiv.org/abs/astro-ph/0008143
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/1460
dc.subjectAstrophysics
dc.titleA search for clusters at high redshift - II. A proto cluster around a radio galaxy at z=2.16
dc.typetext

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