J/A+A/539/A106 DPOSS II compact group survey. EMMI-NTT sample (Pompei+, 2012)
The DPOSS II distant compact group survey: the EMMI-NTT spectroscopic sample.
Pompei E., Iovino A.
<Astron. Astrophys., 539, A106 (2012)>
=2012A&A...539A.106P 2012A&A...539A.106P
ADC_Keywords: Clusters, galaxy ; Spectroscopy ; Morphology
Keywords: methods: observational - techniques: spectroscopic -
galaxies: groups: general
Abstract:
We present the results of a redshift survey of 138 candidate compact
groups from the DPOSS II catalogue, which extends the available
redshift range of spectroscopically confirmed compact groups of
galaxies to redshift z∼0.2. In this survey, we aim to confirm group
membership via spectroscopic redshift information, to measure the
characteristic properties of the confirmed groups, namely their mass,
radius, luminosity, velocity dispersion, and crossing time, and to
compare them with those of nearby compact groups. Using information
available from the literature, we also studied the surrounding group
environment and searched for additional, previously unknown, group
members, or larger scale structures to whom the group might be
associated.
Description:
All the data were obtained with the 3.58m New Technology Telescope
(NTT) and the ESO Multi Mode Instrument (EMMI).
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 86 138 List of our observed compact groups
table2.dat 70 96 Group dynamical properties
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See also:
J/AJ/125/1660 : Distant compact groups from DPOSS (Iovino+, 2003)
J/A+A/445/857 : DPOSS II compact group survey (Pompei+, 2006)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 16 A16 --- Group Group name (PGCHHMMSS+DDMMSS)
18- 19 I2 h RAh Right ascension (J2000)
21- 22 I2 min RAm Right ascension (J2000)
24- 28 F5.2 s RAs Right ascension (J2000)
30 A1 --- DE- Declination sign (J2000)
31- 32 I2 deg DEd Declination (J2000)
34- 35 I2 arcmin DEm Declination (J2000)
37- 41 F5.2 arcsec DEs Declination (J2000)
43 I1 --- Ngal Number of member galaxies
45- 50 I6 km/s cz ? Average redshift
52- 54 I3 km/s e_cz ? rms uncertainty on cz
56- 57 A2 --- Class Group classification (1)
59- 86 A28 --- Notes Notes
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Note (1): Classification as follows:
A = isolated compact group
B = groups close to a large-scale structure
C = all candidate CGs with fewer than three concordant members
CH = core+halo group
CP = close couple of pairs
LG = loose group
PI = close pair with a third galaxy within the ΔV<1000km/s limit
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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- 16 A16 --- Group Group name (PGCHHMMSS+DDMMSS)
18- 23 F6.4 arcmin R Radius
25- 30 F6.2 kpc/arcmin Scale Scale
32- 38 F7.2 km/s sigmar Radial velocity dispersion
40- 45 F6.3 [-] log(H0tc) Dimensionless crossing time, H0*tc
47- 53 E7.2 Msun Mass Mass
55- 61 E7.2 Lsun Lum Luminosity
63- 70 F8.3 Sun M/L Mass-to-luminosity ratio
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History:
From electronic version of the journal
References:
Pompei et al., Paper I 2006A&A...445..857P 2006A&A...445..857P, Cat J/A+A/445/857
(End) Patricia Vannier [CDS] 18-May-2012