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One of the Highest Redshift X-Ray Selected Clusters of Galaxies

Lehmann, Ingo and Hasinger, Günther and Giacconi, Riccardo and Gunn, Jim E. and Schmidt, Maarten and Schneider, Don P. and Stanke, Thomas and Trümper, Joachim and Wambsganss, Joachim and Woods, David and Zamorani, Gianni (2000) One of the Highest Redshift X-Ray Selected Clusters of Galaxies. In: From Extrasolar Planets to Cosmology: The VLT Opening Symposium. ESO Astrophysics Symposia. Springer , Berlin, pp. 121-125. ISBN 978-3-540-67163-3.

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An unusual double-lobed extended X-ray source with an angular size of 1.7 x 0.7 arcmin² and an X-ray flux of 2⋅10⁻¹⁴ erg cm⁻² s⁻¹ has been detected in the ROSAT ultra-deep HRI survey of the Lockman Hole. An R-band image from the Keck telescope shows only a marginal excess of galaxies brighter than 24.5 mag and Keck LRIS spectroscopy of 24 galaxies around the X-ray centroid did not yield a significant number of concordant redshifts. The brightest galaxy near the centre of the eastern emission peak is a gravitationally lensed arc at z=2.570, indicating that the X-ray object is a high-redshift lensing cluster of galaxies. This is the first arc, which is optically brighter than any of the galaxies in the lensing cluster. Recently, deep K′-band images of the region revealed a number of bright galaxies (K′ = 16-17) with very red colours (R−K′) > 6.3 - 6.7. From Bruzual & Charlot evolution models for elliptical galaxies we have estimated a redshift of z∼1.3. This is therefore one of the most distant X-ray selected clusters of galaxies known. Its X-ray luminosity, temperature and lensing mass are in the same range as for clusters found in the local universe.

Item Type:Book Section
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Hasinger, Günther0000-0002-0797-0646
Additional Information:© 2000 Springer-Verlag Berlin Heidelberg. First Online: 22 September 2003.
Series Name:ESO Astrophysics Symposia
Record Number:CaltechAUTHORS:20200708-142323007
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:104281
Deposited By: Tony Diaz
Deposited On:08 Jul 2020 21:40
Last Modified:16 Nov 2021 18:30

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