The XMM Cluster Survey: A Massive Galaxy Cluster at z = 1.45 | Zendy

S. A. Stanford | Zendy; A. K. Romer | Zendy; Kivanc Sabirli | Zendy; M. Davidson | Zendy; Matt Hilton | Zendy; P. T. P. Viana | Zendy; C. A. Collins | Zendy; Scott T. Kay | Zendy; Andrew R. Liddle | Zendy; Robert G. Mann | Zendy; Christopher J. Miller | Zendy; R. C. Nichol | Zendy; Michael J. West | Zendy; Christopher J. Conselice | Zendy; Hyron Spinrad | Zendy; Daniel Stern | Zendy; Kevin Bundy | Zendy

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The XMM Cluster Survey: A Massive Galaxy Cluster at z = 1.45

Author(s) -

S. A. Stanford,

A. K. Romer,

Kivanc Sabirli,

M. Davidson,

Matt Hilton,

P. T. P. Viana,

C. A. Collins,

Scott T. Kay,

Andrew R. Liddle,

Robert G. Mann,

Christopher J. Miller,

R. C. Nichol,

Michael J. West,

Christopher J. Conselice,

Hyron Spinrad,

Daniel Stern,

Kevin Bundy

Publication year - 2006

Publication title -

the astrophysical journal

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 2.376

H-Index - 489

eISSN - 1538-4357

pISSN - 0004-637X

DOI - 10.1086/506449

Subject(s) - physics , astrophysics , cluster (spacecraft) , galaxy cluster , redshift , luminosity , galaxy , astronomy , brightest cluster galaxy , spectroscopy , computer science , programming language

We report the discovery of XMMXCS J2215.9-1738, a massive galaxy cluster at z=1.45, which was found in the XMM Cluster Survey. The cluster candidate wasinitially identified as an extended X-ray source in archival XMM data. Opticalspectroscopy shows that 6 galaxies within a 60 arcsec diameter region lie at z= 1.45 +/- 0.01. Model fits to the X-ray spectra of the extended emission yieldkT = 7.4 (+2.7,-1.8) keV (90 % confidence); if there is an undetected centralX-ray point source then kT = 6.5 (+2.6,-1.8) keV. The bolometric X-rayluminosity is Lx = 4.4 (+0.8,-0.6) x 10^44 ergs/s over a 2 Mpc radial region.The measured Tx, which is the highest known for a cluster at z > 1, suggeststhat this cluster is relatively massive for such a high redshift. The redshiftof XMMXCS J2215.9-1738 is the highest currently known for aspectroscopically-confirmed cluster of galaxies.Comment: Accepted for publication in the The Astrophysical Journal Letters. 5 pages, 5 figure

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