J/MNRAS/339/913 Two distant massive clusters of galaxies (Edge+, 2003) ================================================================================ The discovery of two distant, massive clusters of galaxies in the ROSAT All-Sky Survey. Edge A.C., Ebeling H., Bremer M., Rottgering H., Van Haarlem M.P., Rengelink R., Courtney N.J.D. =2003MNRAS.339..913E ================================================================================ ADC_Keywords: Clusters, galaxy ; X-ray sources ; Radio sources Keywords: galaxies: clusters: individual: MACS J0717.5 +3745 - galaxies: clusters: individual: MACS J1621.3 +3810 - cooling flows - radio continuum: galaxies Abstract: We discuss the radio, optical, and X-ray properties of two newly discovered, very X-ray luminous, distant clusters of galaxies. Both systems were noted as cluster candidates in a cross-correlation of data from the WENSS () radio survey and the ROSAT All-Sky Survey (). Follow-up observations performed by us and the Massive Cluster Survey (MACS) team confirmed both sources as distant galaxy clusters. The first cluster, MACS J0717.5+3745 at a redshift of z=0.5548, contains a very extended, steep-spectrum radio source offset from the cluster core, making it the most distant radio relic known. The second cluster, MACS J1621.3+3810 at z=0.465, is a strong cooling flow with a relatively weak central radio source. We present results from ROSAT High-Resolution Imager (HRI, Cat. ) observations of both clusters as well as from optical imaging and VLA radio interferometry observations. Our discoveries demonstrate that distant clusters can be efficiently identified in a relatively shallow X-ray survey, that radio/X-ray selection is efficient, and that both cooling flow and non-cooling flow clusters are selected. File Summary: -------------------------------------------------------------------------------- FileName Lrecl Records Explanations -------------------------------------------------------------------------------- ReadMe 80 . This file table2.dat 107 112 Identifications of cluster candidates and known clusters with z>0.3. refs.dat 71 17 References -------------------------------------------------------------------------------- See also: IX/10 : ROSAT All-Sky Bright Source Catalogue (1RXS) (Voges+ 1999) IX/28 : ROSAT HRI Pointed Observations (1RXH) (ROSAT Team, 2000) I/221 : The Magellanic Catalogue of Stars - MACS (Tucholke+ 1996) VIII/62 : The Westerbork Northern Sky Survey (Leiden, 1998) Byte-by-byte Description of file: table2.dat -------------------------------------------------------------------------------- Bytes Format Units Label Explanations -------------------------------------------------------------------------------- 1- 16 A16 --- RASS-BSC RASS-BSC designation (JHHMMSS.s+DDMMSS) 17 A1 --- n_RASS-BSC [*] Note (1) 19- 33 A15 --- WENSS WENSS designation (WNBHHMM.m+DDMM) 34- 37 F4.1 arcsec OffSet Offset between RASS-BSC and WENSS objects 39- 43 I5 mJy Flux WENSS Integrated flux density at 330MHz 45- 49 F5.2 --- Sp-Index Spectral index (alpha^1.4GHz^_365MHz_) 51 A1 --- P1.4GHz [YN] Polarized flag, Pol_1.4GHz_>2% 53 A1 --- Obs? [YN-] Observed ? 55-104 A50 --- Note Comments, identifications and redshifts (2) 106-107 I2 --- Ref ? Reference for redshift specified in Com, in refs.dat file (3) -------------------------------------------------------------------------------- Note (1): Sources marked with an asterisk do not meet the final selection criteria but were imaged to provide a control sample. Note (2): MACS JHHMM.m+DDMM identified as MCS JHHMMm+DDMM in Simbad Note (3): References are given to all redshifts published in the last decade. -------------------------------------------------------------------------------- Byte-by-byte Description of file: refs.dat -------------------------------------------------------------------------------- Bytes Format Units Label Explanations -------------------------------------------------------------------------------- 1- 2 I2 --- Ref Reference code 4- 22 A19 --- BibCode BibCode 24- 48 A25 --- Aut Author's name 50- 72 A23 --- Com Comments -------------------------------------------------------------------------------- History: From electronic version of the journal ================================================================================ (End) Patricia Bauer [CDS] 27-May-2003