Serendipitous XMM-Newton discovery of a cluster of galaxies at z=0.28

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dc.creatorGastaldello, Fabio
dc.creatorBuote, David A.
dc.creatorHumphrey, Philip J.
dc.creatorZappacosta, Luca
dc.creatorSeigar, Marc S.
dc.creatorBarth, Aaron J.
dc.creatorBrighenti, Fabrizio
dc.creatorMathews, William G.
dc.date2007-03-16
dc.date.accessioned2026-07-07T11:01:07Z
dc.date.available2026-07-07T11:01:07Z
dc.descriptionWe report the discovery of a galaxy cluster serendipitously detected as an extended X-ray source in an offset observation of the group NGC 5044. The cluster redshift, z=0.281, determined from the optical spectrum of the brightest cluster galaxy, agrees with that inferred from the X-ray spectrum using the Fe K alpha complex of the hot ICM (z=0.27 +/- 0.01). Based on the 50 ks XMM observation, we find that within a radius of 383 kpc the cluster has an unabsorbed X-ray flux, f_X (0.5-2 keV) = 3.34 (+0.08, -0.13) x 10^{-13} erg/cm^2/s, a bolometric X-ray luminosity, L_X = 2.21 (+0.34, -0.19) x 10^{44} erg/s, kT = 3.57 +/- 0.12 keV, and metallicity, 0.60 +/- 0.09 solar. The cluster obeys the scaling relations for L_X and T observed at intermediate redshift. The mass derived from an isothermal NFW model fit is, M_vir = 3.89 +/- 0.35 x 10^{14} solar masses, with a concentration parameter, c = 6.7 +/- 0.4, consistent with the range of values expected in the concordance cosmological model for relaxed clusters. The optical properties suggest this could be a ``fossil cluster''.
dc.description5 pages, 4 colour figures, accepted for publication in ApJ
dc.identifierhttps://arxiv.org/abs/astro-ph/0703461
dc.identifierhttp://arxiv.org/abs/astro-ph/0703461
dc.identifierAstrophys.J.662:923-926,2007
dc.identifierdoi:10.1086/518304
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/187864
dc.subjectAstrophysics
dc.titleSerendipitous XMM-Newton discovery of a cluster of galaxies at z=0.28
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