J/A+A/391/35 Compact Groups in the UZC galaxy sample (Focardi+, 2002)
Compact Groups in the UZC galaxy sample.
Focardi P., Kelm B.
<Astron. Astrophys. 391, 35 (2002)>
=2002A&A...391...35F 2002A&A...391...35F
ADC_Keywords: Clusters, galaxy ; Galaxy catalogs ; Radial velocities
Keywords: galaxies: clusters: general - galaxies: interactions
Abstract:
Applying an automatic neighbour search algorithm to the 3D UZC galaxy
catalogue (Falco et al., 1999, Cat. J/PASP/111/438) we have
identified 291 compact groups (CGs) with radial velocity between 1000
and 10000km/s. The sample is analysed to investigate whether Triplets
display kinematical and morphological characteristics similar to
higher order CGs (Multiplets). It is found that Triplets constitute
low velocity dispersion structures, have a gas-rich galaxy population
and are typically retrieved in sparse environments. Conversely
Multiplets show higher velocity dispersion, include few gas-rich
members and are generally embedded structures. Evidence hence emerges
indicating that Triplets and Multiplets, though sharing a common
scale, correspond to different galaxy systems. Triplets are typically
field structures whilst Multiplets are mainly subclumps (either
temporarily projected or collapsing) within larger structures.
Simulations show that selection effects can only partially account for
differences, but significant contamination of Triplets by field galaxy
interlopers could eventually induce the observed dependences on
multiplicity.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 51 291 The Compact groups sample
table1.tex 93 581 LaTeX version of table 1
table2.dat 50 986 Galaxy members for each Cluster of Galaxy
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See also:
VII/213 : Hickson's Compact groups of Galaxies (Hickson+ 1982-1994)
J/PASP/111/438 : Updated Zwicky catalog (UZC) (Falco+, 1999)
J/AJ/123/2976 : The UZC-SSRS2 group catalog (Ramella+, 2002)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 3 I3 --- Seq Compact Group (CG) sequential number
5- 6 I2 h RAh Right ascension (J2000)
8- 9 I2 min RAm Right ascension (J2000)
11- 12 I2 s RAs Right ascension (J2000)
14 A1 --- DE- Declination sign (J2000)
15- 16 I2 deg DEd Declination (J2000)
18- 19 I2 arcmin DEm Declination (J2000)
21- 22 I2 arcsec DEs Declination (J2000)
24 I1 --- Nmemb Number of members
26- 28 I3 kpc CG mean projected dimension
30- 33 I4 km/s cz CG radial velocity
35- 37 I3 km/s sigma CG velocity dispersion
39- 40 I2 --- NR ? Number of CG neighbours counted out to 1Mpc
(only for CGs with cz>1500km/s)
42- 61 A20 --- HCG/RSCG Cross identification with
HCG (Cat. VII/213, H NN) and
RSCG (Barton et al., 1996AJ....112..871B 1996AJ....112..871B,
R NN)
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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- 3 I3 --- Seq Compact Group (CG) sequential number
6- 15 A10 --- Gal Galaxy identification as in UZC
(Falco et al., 1999, Cat. J/PASP/111/438)
17- 18 I2 h RAh Right ascension (J2000)
20- 21 I2 min RAm Right ascension (J2000)
23- 26 F4.1 s RAs Right ascension (J2000)
28 A1 --- DE- Declination sign (J2000)
29- 30 I2 deg DEd Declination (J2000)
32- 33 I2 arcmin DEm Declination (J2000)
35- 36 I2 arcsec DEs Declination (J2000)
38- 42 F5.2 mag Bmag UZC B magnitude
44- 48 I5 km/s cz UZC heliocentric redshift
50 A1 --- T [ABE] UZC spectral classification
A absorption lines, E emission lines, B both
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Acknowledgements: Paola Focardi
(End) Patricia Bauer [CDS] 03-May-2002