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J/AJ/123/2261       Radial velocities in A2256               (Berrington+, 2002)

The dynamics of the merging galaxy cluster system A2256: evidence for a new subcluster. Berrington R.C., Lugger P.M., Cohn H.N. <Astron. J. 123, 2261 (2002)> =2002AJ....123.2261B
ADC_Keywords: Clusters, galaxy ; Radial velocities Keywords: galaxies: clusters: individual (A2256) Abstract: We present 236 new radial velocities of galaxies in the cluster A2256 measured with the WIYN Hydra Multi-Object Spectrograph. Combined with the previous work of Fabricant, Kent, & Kurtz (1989ApJ...336...77F), we have velocities for a total of 319 galaxies, of which 277 are cluster members. In addition to the new radial velocities, we present a 3x3 image mosaic in the R band of the central 19'x19' region of A2256, from which we obtained photometry for 861 galaxies. These data provide strong evidence for a merger event between two groups. In addition, we present evidence for the presence of a third group, on the outer reaches of the system, that is just now beginning to merge with the system. File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table3.dat 64 319 Galaxy Catalog for A2256 table10.dat 42 34 Radio source positions in A2256
See also: J/ApJ/534/114 : RASSCALS: X-ray and optical study (Mahdavi+, 2000) J/ApJS/129/435 : NORAS galaxy cluster survey. I. (Bohringer+, 2000) Byte-by-byte Description of file: table3.dat
Bytes Format Units Label Explanations
1- 4 I4 --- [BLC2002] Galaxy identification number 6- 7 I2 h RAh Hour of Right Ascension (J2000) 9- 10 I2 min RAm Minute of Right Ascension (J2000) 12- 15 F4.1 s RAs Second of Right Ascension (J2000) 16 A1 --- DE- Sign of Declination (J2000) 17- 18 I2 deg DEd Degree of Declination (J2000) 20- 21 I2 arcmin DEm Arcminute of Declination (J2000) 23- 26 F4.1 arcsec DEs Arcsecond of Declination (J2000) 28- 32 F5.2 mag Rcmag ? The Kron-Cousins R band magnitude as reported by Faint-Object Classification Analysis System 34- 37 F4.2 mag e_Rcmag ? The 1σ error in Rmag 39- 43 F5.2 mag rmag ? The Fabricant et al. (1989ApJ...336...77F) r band isophotal magnitude 45- 52 F8.2 km/s cz The radial velocity (1) 54- 59 F6.2 km/s e_cz The 1σ error in cz 61- 63 I3 --- [FKK89] ? Fabricant et al. (1989ApJ...336...77F) identification number
Note (1): Obtained either in the present study or in the previous studies of Faber & Dressler (1977AJ.....82..187F) and Fabricant et al. (1989ApJ...336...77F). The new velocity measurement is reported for those galaxies that were remeasured.
Byte-by-byte Description of file: table10.dat
Bytes Format Units Label Explanations
1- 2 A2 --- Comp Radio Component, from Roettiger et al. 1993ApJ...407L..53R and Bridle et al. 1979A&A....80..201B 4- 5 I2 h RAh Right ascension (J2000) 7- 8 I2 min RAm Right ascension (J2000) 10- 13 F4.1 s RAs Right ascension (J2000) 15 A1 --- DE- Declination sign (J2000) 16- 17 I2 deg DEd Declination (J2000) 19- 20 I2 arcmin DEm Declination (J2000) 22- 25 F4.1 arcsec DEs Declination (J2000) 27- 29 I3 --- [BLC2002] ? Galaxy optical counterpart number 31 I1 --- Group ? Group membership of the optical counterpart if one is known 33- 39 F7.1 km/s RV ? Radial velocity of the galaxy
History: From electronic version of the journal
(End) Greg Schwarz [AAS], Patricia Bauer [CDS] 17-Jun-2002
The document above follows the rules of the Standard Description for Astronomical Catalogues.From this documentation it is possible to generate f77 program to load files into arrays or line by line

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