TY - JOUR
T1 - The ROSAT Deep Survey IV. A distant lensing cluster of galaxies with a bright arc
AU - Hasinger, G.
AU - Giacconi, R.
AU - Gunn, J. E.
AU - Lehmann, I.
AU - Schmidt, M.
AU - Schneider, D. P.
AU - Trümper, J.
AU - Wambsganss, J.
AU - Woods, D.
AU - Zamorani, G.
PY - 1998
Y1 - 1998
N2 - An unusual double-lobed extended X-ray source (RX J105343+5735) is detected in the ROSAT ultra-deep HRI image of the Lockman Hole. The angular size of the source is 1.7 × 0.7 arcmin2 and its X-ray flux is 2 × 10-14 erg cm-2 s-1. R-band imaging from the Keck telescope revealed a marginal excess of galaxies brighter than R=24.5, but Keck LRIS spectroscopy of 24 objects around the X-ray centroid did not yield a significant number of concordant redshifts. The brightest galaxy close to the centre of the eastern emission peak appears to be a gravitationally lensed arc at z=2.570, suggesting that the X-ray object is associated with the lens, most likely a cluster of galaxies. Based on a comparison of lensing surface mass density, X-ray luminosity, morphology and galaxy magnitudes with clusters of known distance, we argue that RX J105343+5735 is a cluster at a redshift around 1. Future X-ray, ground-based optical/NIR and high resolution HST observations of the system will be able to clarify the nature of the object.
AB - An unusual double-lobed extended X-ray source (RX J105343+5735) is detected in the ROSAT ultra-deep HRI image of the Lockman Hole. The angular size of the source is 1.7 × 0.7 arcmin2 and its X-ray flux is 2 × 10-14 erg cm-2 s-1. R-band imaging from the Keck telescope revealed a marginal excess of galaxies brighter than R=24.5, but Keck LRIS spectroscopy of 24 objects around the X-ray centroid did not yield a significant number of concordant redshifts. The brightest galaxy close to the centre of the eastern emission peak appears to be a gravitationally lensed arc at z=2.570, suggesting that the X-ray object is associated with the lens, most likely a cluster of galaxies. Based on a comparison of lensing surface mass density, X-ray luminosity, morphology and galaxy magnitudes with clusters of known distance, we argue that RX J105343+5735 is a cluster at a redshift around 1. Future X-ray, ground-based optical/NIR and high resolution HST observations of the system will be able to clarify the nature of the object.
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M3 - Review article
AN - SCOPUS:0002511497
SN - 0004-6361
VL - 340
SP - L27-L30
JO - Astronomy and Astrophysics
JF - Astronomy and Astrophysics
IS - 2
ER -