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J/AJ/106/1273    Kinematics of dense clusters of galaxies      (Zabludoff+ 1993)

The kinematics of dense clusters of galaxies. I. The data. Zabludoff A.I., Geller M.J., Huchra J.P., Vogeley M.S. <Astron. J. 106, 1273 (1993)> =1993AJ....106.1273Z
ADC_Keywords: Clusters, galaxy; Radial velocities; Velocity dispersion Abstract: We have measured redshifts in the fields of the 31 R≥1 Abell clusters with 0.02<z<0.05 and |bII|>30°, from medium resolution spectra (5 or 7Å). At least ten of the fields are severely contaminated by superimposed velocity peaks. We derive the mean velocities and velocity dispersions of the 25 dense peaks in the sample. The abundance of peaks, 6.6x10-6h3 Mpc-3, is consistent with the mean number density of R>1 Abell clusters (Bahcall & Soneira 1983ApJ...270...20B). The range of velocity dispersions is 304-1346 km/s. The median dispersion is 718 km/s. The subset of eight systems with cD galaxies has a median velocity dispersion of 792 km/s, close to that of non-cD systems (626 km/s). When these data are combined with 16 cD cluster velocity dispersions from our previous study (Zabludoff et al. 1990ApJS...74....1Z, and Dunn [Proceedings of NATO Conf. 1991]), eight of 25 cD galaxies have peculiar motions larger than half the cluster velocity dispersions. These findings further support the conclusions of Beers & Geller (1983ApJ...274..491B), and Dunn (1991), who argue that cD galaxies do not lie in the global kinematic center, but in local potential minima. If so, systems with speeding cD's are probably a guide to substructure in dynamically evolving systems. File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table1.dat 64 564 Cluster data table2.dat 80 47 Peak velocity dispersions
Byte-by-byte Description of file: table1.dat
Bytes Format Units Label Explanations
1- 5 A5 --- Cluster Abell cluster designation 7- 22 A16 --- Galaxy Galaxy name (1) 24- 25 I2 h RAh Right Ascension 1950 (hours) 27- 28 I2 min RAm Right Ascension 1950 (minutes) 30- 33 F4.1 s RAs Right Ascension 1950 (seconds) 35 A1 - DE- Declination 1950 (sign) 36- 37 I2 deg DEd Declination 1950 (degrees) 39- 40 I2 arcmin DEm Declination 1950 (minutes) 42- 43 I2 arcsec DEs Declination 1950 (seconds) 47- 51 F5.2 mag B(0) []? Integrated magnitude 52 A1 --- n_B(0) [RMCPHK] Origin of B(0) (2) 55- 59 I5 km/s RV Velocity 62- 64 I3 km/s e_RV Mean error on V
Note (1): Names with RA given with five digits are normally from Zwicky catalogues; the other (with four digits in RA, starting or not with the letter A) are anonymous galaxies. Note (2): C = CCD photometry (CfA redshift survey 1992) H = Zwicky magnitude split by observers K = Markarian catalogue of galaxies (1967) M = MCG (Vorontsov-Velyaminov et al. 1962-68) P = observer's eye estimate R = RC1 (de Vaucouleurs & de Vaucouleurs 1964)
Byte-by-byte Description of file: table2.dat
Bytes Format Units Label Explanations
1- 5 A5 --- Cluster Abell cluster designation 7- 14 A8 --- Peak Peak name (1) 15- 16 A2 --- n_Peak Note (2) 18- 19 I2 h RAh Right ascension (1950.0) 21- 24 F4.1 min RAm Right ascension (1950.0) 26 A1 --- DE- Declination sign (1950.0) 27- 28 I2 deg DEd Declination (1950.0) 30- 31 I2 arcmin DEm Declination (1950.0) 33- 35 I3 --- Ntot Total number of redshifts in the field 38- 43 F6.3 10+3km/s Vlow Velocity limit which enclose member galaxies 45 A1 --- --- [-] 47- 50 F4.1 10+3km/s Vup Velocity limit which enclose member galaxies 53- 55 I3 --- Nc Number of member galaxies 58- 62 I5 km/s <v> Mean velocity 64- 66 I3 km/s e_<v> rms uncertainty on mean velocity 69- 72 I4 km/s sigma Line-of-sight velocity dispersion 74- 76 I3 km/s E_sigma Error on sigma (upper limit) 78- 80 I3 km/s e_sigma Error on sigma (lower limit)
Note (1): Peak name: Peak name in the form A119A, or [A154B]. Note (2): Notes: d: dense cluster sample c: cD cluster
History: * 20-Apr-1994: Keypunched at CDS * 24-Sep-2001: error communicated by H.A. Andernach: name corrected for galaxy at 14 00 06.4 -11 26 36 * 01-Jan-2002: table2 added
(End) Francois Ochsenbein [CDS] 20-Apr-1994
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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