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Titolo:
The ROSAT deep survey - VII. RX J105343+5735: A massive cluster at z=1.263
Autore:
Thompson, D; Pozzetti, L; Hasinger, G; Lehmann, I; Schmidt, M; Soifer, BT; Szokoly, G; Wilson, G; Zamorani, G;
Indirizzi:
CALTECH, Palomar Observ, Pasadena, CA 91125 USA CALTECH Pasadena CA USA 91125 ECH, Palomar Observ, Pasadena, CA 91125 USA Osservatorio Astron Bologna, I-40127 Bologna, Italy Osservatorio Astron Bologna Bologna Italy I-40127 I-40127 Bologna, Italy Astrophys Inst Potsdam, D-14482 Potsdam, Germany Astrophys Inst Potsdam Potsdam Germany D-14482 D-14482 Potsdam, Germany Penn State Univ, Dept Astron & Astrophys, Davey Lab 525, University Pk, PA16802 USA Penn State Univ University Pk PA USA 16802 25, University Pk, PA16802 USA CALTECH, SIRTF Sci Ctr, Pasadena, CA 91125 USA CALTECH Pasadena CA USA 91125 TECH, SIRTF Sci Ctr, Pasadena, CA 91125 USA Brown Univ, Dept Phys, Providence, RI 02912 USA Brown Univ Providence RI USA 02912 v, Dept Phys, Providence, RI 02912 USA
Titolo Testata:
ASTRONOMY & ASTROPHYSICS
fascicolo: 3, volume: 377, anno: 2001,
pagine: 778 - 783
SICI:
1432-0746(200110)377:3<778:TRDS-V>2.0.ZU;2-Y
Fonte:
ISI
Lingua:
ENG
Soggetto:
GALAXIES; FIELD; SPECTROSCOPY; LUMINOSITY;
Keywords:
galaxies : clusters, distances and redshifts; cosmology : observations, gravitational lensing; infrared : galaxies; X-rays : galaxies;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
26
Recensione:
Indirizzi per estratti:
Indirizzo: Thompson, D CALTECH, Palomar Observ, MS 320-47, Pasadena, CA 91125 USA CALTECH MS 320-47 Pasadena CA USA 91125 Pasadena, CA 91125 USA
Citazione:
D. Thompson et al., "The ROSAT deep survey - VII. RX J105343+5735: A massive cluster at z=1.263", ASTRON ASTR, 377(3), 2001, pp. 778-783

Abstract

The eastern lobe of the unusual double-lobed extended X-ray source RX J105343+5735 is confirmed to be a massive cluster at high redshift. Deep optical and near-infrared imaging show an overdensity of galaxies in both X-ray lobes, including a significant excess of red galaxies (R - K >5.3) with colors typical of elliptical galaxies at z >1. We have used new photometry to place better constraints on the redshifts of the cluster galaxies. A Keck NIRSPEC spectrum of one of the bright central galaxies in the eastern lobe shows a narrow H alpha emission line at 1.485 microns, yielding a redshift of1.263. The [O II] lambda 3727 Angstrom line from the gravitationally lensed arc is also detected, giving a redshift of 2.577 for the lensed galaxy and confirming prior measurements. The improbability of chance alignment and similarity of colors for the galaxies in the two X-ray lobes are consistentwith the western lobe also being at z = 1.26. The system may thus represent a pair of clusters in the process of merging.

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Documento generato il 01/12/20 alle ore 08:23:32