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 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 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 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 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:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 64 564 Cluster data
table2.dat 80 47 Peak velocity dispersions
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Byte-per-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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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
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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)
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Byte-by-byte Description of file: table2.dat
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Bytes Format Units Label Explanations
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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 Mean velocity
64- 66 I3 km/s e_ 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)
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Note (1): Peak name:
Peak name in the form A119A, or [A154B].
Note (2): Notes:
d: dense cluster sample
c: cD cluster
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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