J/ApJ/580/774 X-ray cluster of galaxies behind the Milky way (Ebeling+, 2002) ================================================================================ A systematic X-ray search for clusters of galaxies behind the Milky way. Ebeling H., Mullis C.R., Tully R.B. =2002ApJ...580..774E ================================================================================ ADC_Keywords: Clusters, galaxy ; X-ray sources ; Redshifts Keywords: galaxies: clusters: general - surveys - X-rays: galaxies: clusters Abstract: We report on the design and status of the Clusters in the Zone of Avoidance (CIZA) project, the first systematic X-ray search for clusters of galaxies behind the Milky Way. Our project, Clusters in the Zone of Avoidance (CIZA), uses X-ray data from the RASS for the initial cluster candidate selection and subsequent optical and NIR observations to confirm or refute the cluster nature of all selected candidates. We demonstrate that an X-ray survey can find galaxy clusters at low Galactic latitude where optical searches are inefficient because of massive obscuration and extinction problems. We discuss the rationale for such a survey in the context of large-scale structure studies and describe in detail the combined X-ray/optical/NIR approach used by CIZA to identify clusters of galaxies at |b|<20{deg}, a region of the sky that has traditionally been excluded from earlier cluster catalogs. So far, CIZA has identified and spectroscopically confirmed 137 galaxy clusters in what used to be the zone of avoidance; additional clusters have been confirmed in imaging observations and await spectroscopic observation. We present a catalog of the 73 X-ray brightest CIZA clusters, 53 (73%) of which are new discoveries. File Summary: -------------------------------------------------------------------------------- FileName Lrecl Records Explanations -------------------------------------------------------------------------------- ReadMe 80 . This file table1.dat 132 73 Catalog of the 73 X-Ray brightest clusters from the CIZA survey (Clusters In the Zone of Avoidance) refs.dat 115 19 References -------------------------------------------------------------------------------- See also: IX/10 : ROSAT All-Sky Bright Source Catalogue (1RXS) (Voges+ 1999) IX/29 : ROSAT All-Sky Survey Faint Source Catalog (Voges+ 2000) VII/209 : Galaxies Behind the Milky Way (Saito+ 1990-91; Roman+ 1996-98) J/A+A/387/1 : DENIS galaxies behind the Milky Way (Vauglin+, 2002) J/ApJS/89/57 : IRAS galaxies behind southern Milky Way (Yamada+, 1993) J/A+AS/104/529 : IRAS galaxies behind the Milky Way (Takata+ 1994) J/A+AS/141/123 : Galaxies behind Southern Milky Way (Kraan-Korteweg 2000) J/ApJS/112/245 : Redshift survey for IRAS galaxies (Nakanishi+ 1997) Byte-by-byte Description of file: table1.dat -------------------------------------------------------------------------------- Bytes Format Units Label Explanations -------------------------------------------------------------------------------- 1- 4 A4 --- --- [CIZA] 6- 17 A12 --- CIZA CIZA designation (JHHMM.m+DDMM) 19- 40 A22 --- Name Other name 43- 44 I2 h RAh Cluster X-ray centroid Right ascension (J2000.0) 46- 47 I2 min RAm Cluster X-ray centroid Right ascension (J2000.0) 49- 52 F4.1 s RAs Cluster X-ray centroid Right ascension (J2000.0) 54 A1 --- DE- Cluster X-ray centroid Declination sign (J2000.0) 55- 56 I2 deg DEd Cluster X-ray centroid Declination (J2000.0) 58- 59 I2 arcmin DEm Cluster X-ray centroid Declination (J2000.0) 61- 62 I2 arcsec DEs Cluster X-ray centroid Declination (J2000.0) 64- 70 F7.3 deg GLON Galacitc longitude 72- 78 F7.3 deg GLAT Galactic latitude 80- 86 F7.4 ct/s CR Total cluster count rate in ROSAT broad band 88- 93 F6.4 ct/s e_CR rms uncertainty on CR 95- 99 F5.2 10+20cm-2 NH Equivalent neutral hydrogen column density (1) 101-106 F6.2 10-15W/m2 FX Total cluster flux at 0.1-2.4keV (2) 108-113 F6.4 --- z Redshift 114 A1 --- u_z [)] Uncertainty flag on z 116-120 F5.2 10+37W LX Total cluster X-ray luminosity at 0.1-2.4keV in units of 10^44^h_50_^-2^erg/s 122-131 A10 --- r_z ? Redshift references, separated by comma 132 A1 --- n_z [e] e: estimated redshift -------------------------------------------------------------------------------- Note (1): From Dickey & Lockman (1990ARA&A..28..215D) Note (2): Asssuming a metallicity of 0.3 solar and a cluster gas temperature consistent with the LX-T relation of White, Jones, & Forman (1997MNRAS.292..419W) -------------------------------------------------------------------------------- Byte-by-byte Description of file: refs.dat -------------------------------------------------------------------------------- Bytes Format Units Label Explanations -------------------------------------------------------------------------------- 1- 2 I2 --- Ref Reference number 4- 22 A19 --- BibCode BibCode 24- 44 A21 --- Aut Author's name 49-115 A67 --- Com Comments -------------------------------------------------------------------------------- History: From electronic version of the journal ================================================================================ (End) James Marcout, Patricia Bauer [CDS] 06-Feb-2003