J/AJ/104/2078 cD Galaxy in Abell 2107 (Oegerle+ 1992)
Structure, rotation, and the peculiar velocity cD galaxy in Abell 2107
OEGERLE W.R., HILL J.M.
<Astron. J. 104, 2078 (1992)>
=1992AJ....104.2078O 1992AJ....104.2078O
ADC_Keywords: Clusters, galaxy; Radial velocities
Abstract:
As part of a program to study the kinematics of cD clusters of
galaxies, we have measured the radial velocities of 75 galaxies in the
field of Abell 2107. Sixty-eight of these galaxies are cluster
members. The mean observed velocity of A2105 is 12335 ± 86 km/s and
the velocity dispersion is 672 [+67,-52] km/s. The cD galaxy has a
peculiar velocity of 270 km/s with respect to the cluster mean. The
distribution of velocities is well fitted by a Gaussian, but the
velocities are spatially correlated. We have investigated simple
two-body subcluster models for A2107, which are consistent with the
observed data and account for the peculiar velocity of the cD galaxy.
Alternatively, the spatial distribution of velocities is also
consistent with rotation of a single cluster at the 98% confidence
level. However, the pure rotation model fails to explain the peculiar
velocity of the cD galaxy, which lies at the center of the cluster.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1 57 75 Velocity data
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Byte-by-byte Description of file: table1
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Bytes Format Units Label Explanations
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1- 3 I3 --- ID Identifying number
5- 6 I2 h RAh Right ascension J2000
8- 9 I2 min RAm Right ascension J2000
11- 15 F5.2 s RAs Right ascension J2000
16 A1 --- DE- Declination J2000 sign
17- 18 I2 deg DEd Declination J2000
20- 21 I2 arcmin DEm Declination J2000
23- 26 F4.1 arcsec DEs Declination J2000
28- 32 I5 km/s cz Observed heliocentric-corrected velocity
34- 57 A24 --- Com Comments on the presence of emission lines and
the galaxies used as correlation templates
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Origin: AAS CD-ROM series, Volume 1, 1993
(End) Patricia Bauer [CDS] 06-Jul-1994