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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
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:
FileName Lrecl Records Explanations
ReadMe 80 . This file table1.dat 86 138 List of our observed compact groups table2.dat 70 96 Group dynamical properties
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
Bytes Format Units Label Explanations
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
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
Byte-by-byte Description of file: table2.dat
Bytes Format Units Label Explanations
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
History: From electronic version of the journal References: Pompei et al., Paper I 2006A&A...445..857P, Cat J/A+A/445/857
(End) Patricia Vannier [CDS] 18-May-2012
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