Volume 377, Number 3, October III 2001
|Page(s)||778 - 783|
|Section||Cosmology (including clusters of galaxies)|
|Published online||15 October 2001|
The ROSAT deep survey
VII. RX J105343+5735: A massive cluster at 1.263
Palomar Observatory, California Institute of Technology, MS 320-47 Pasadena, CA 91125, USA
2 Osservatorio Astronomico di Bologna, Via Ranzani 1, 40127 Bologna, Italy
3 Astrophysikalisches Institut Potsdam, An der Sternwarte 16, 14482 Postdam, Germany
4 Department of Astronomy & Astrophysics, 525 Davey Laboratory, The Pennsylvania State University, University Park, PA 16802, USA
5 SIRTF Science Center, California Institute of Technology, Pasadena, CA 91125, USA
6 Physics Department, Brown University 182 Hope Street Providence, RI 02912, USA
Corresponding author: D. Thompson, firstname.lastname@example.org
Accepted: 16 July 2001
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 () with colors typical of elliptical galaxies at . 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 Hα emission line at 1.485 microns, yielding a redshift of 1.263. The [Oii] λ3727 Å 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 consistent with the western lobe also being at . The system may thus represent a pair of clusters in the process of merging.
Key words: galaxies: clusters: general / galaxies: distances and redshifts / cosmology: observations / gravitational lensing / infrared: galaxies / X-rays: galaxies
© ESO, 2001
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