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We present first results on PLCKG266.6-27.3, a galaxy cluster candidate detected at a signal-to-noise ratio of 5 in the Planck All Sky survey. An XMM-Newton validation observation has allowed us to confirm that the candidate isa bona fide galaxy cluster. With these X-ray data we measure an accurate redshift, z = 0.94 ± 0.02, and estimate the cluster mass to be M 500 = (7.8 ± 0.8) × 1014 M. PLCKG266.6-27.3 is an exceptional system: its luminosity of LX [0.5-2.0 keV] = (1.4 ± 0.05) × 1045 erg s-1 equals that of the two most luminous known clusters in the z > 0.5 universe, and it is one of the most massive clusters at z ~ 1. Moreover, unlike the majority of high-redshift clusters, PLCKG266.6-27.3 appears to be highly relaxed. This observation confirms Planck's capability of detecting high-redshift, high-mass clusters, and opens the way to the systematic study of population evolution in the exponential tail of the mass function. © ESO, 2011.

Planck early results. XXVI. Detection with Planck and confirmation by XMM-Newton of PLCK G266.6-27.3, an exceptionally X-ray luminous and massive galaxy cluster at z ~ 1 / Planck, C., N., A., M., A., M., A., F., A.B., J., A., C., B., A., B., A. J., B., R. B., B., J. G., B., E., B., K., B., A., B., J. P., B., M., B., R., B., H., B., A., B., J. R., B., et al.. - In: ASTRONOMY & ASTROPHYSICS. - ISSN 0004-6361. - STAMPA. - 536:(2011), p. A26. [10.1051/0004-6361/201117430]

Planck early results. XXVI. Detection with Planck and confirmation by XMM-Newton of PLCK G266.6-27.3, an exceptionally X-ray luminous and massive galaxy cluster at z ~ 1

CABELLA, PAOLO;CATALANO, Andrea;DE BERNARDIS, Paolo;G. De Gasperis;LUZZI, GEMMA;MASI, Silvia;MELCHIORRI, Alessandro;PIACENTINI, Francesco;POLENTA, GIANLUCA;RICCIARDI, Sara;SAVINI, Giorgio;
2011

Abstract

We present first results on PLCKG266.6-27.3, a galaxy cluster candidate detected at a signal-to-noise ratio of 5 in the Planck All Sky survey. An XMM-Newton validation observation has allowed us to confirm that the candidate isa bona fide galaxy cluster. With these X-ray data we measure an accurate redshift, z = 0.94 ± 0.02, and estimate the cluster mass to be M 500 = (7.8 ± 0.8) × 1014 M. PLCKG266.6-27.3 is an exceptional system: its luminosity of LX [0.5-2.0 keV] = (1.4 ± 0.05) × 1045 erg s-1 equals that of the two most luminous known clusters in the z > 0.5 universe, and it is one of the most massive clusters at z ~ 1. Moreover, unlike the majority of high-redshift clusters, PLCKG266.6-27.3 appears to be highly relaxed. This observation confirms Planck's capability of detecting high-redshift, high-mass clusters, and opens the way to the systematic study of population evolution in the exponential tail of the mass function. © ESO, 2011.
2011
x-rays; galaxies; clusters; cosmic background radiation; cosmology; general; intracluster medium; observations
01 Pubblicazione su rivista::01a Articolo in rivista
Planck early results. XXVI. Detection with Planck and confirmation by XMM-Newton of PLCK G266.6-27.3, an exceptionally X-ray luminous and massive galaxy cluster at z ~ 1 / Planck, C., N., A., M., A., M., A., F., A.B., J., A., C., B., A., B., A. J., B., R. B., B., J. G., B., E., B., K., B., A., B., J. P., B., M., B., R., B., H., B., A., B., J. R., B., et al.. - In: ASTRONOMY & ASTROPHYSICS. - ISSN 0004-6361. - STAMPA. - 536:(2011), p. A26. [10.1051/0004-6361/201117430]
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11573/429054
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