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VII/213             Hickson's Compact groups of Galaxies   (Hickson+ 1982-1994)

Systematic Properties of Compact Groups of Galaxies Hickson P. <Astrophys. J. 255, 382 + Erratum 259, 930 (1982)> =1982ApJ...255..382H A photometric catalog of compact groups of galaxies. Hickson P., Kindl E., Auman J.R. <Astrophys. J. Suppl. Ser. 70, 687 (1989)> =1989ApJS...70..687H The luminosity function of compact groups of galaxies Mendes de Oliveira C., Hickson P. <Astrophys. J. 380, 30 (1991)> =1991ApJ...380...30M Dynamical properties of compact groups of galaxies. Hickson P., Mendes de Oliveira C., Huchra J.P., Palumbo G.G.C. <Astrophys. J. 399, 353 (1992)> =1992ApJ...399..353H Morphology of galaxies in compact groups. Mendes de Oliveira C., Hickson P. <Astrophys. J., 427, 684 (1994)> =1994ApJ...427..684M
ADC_Keywords: Clusters, galaxy ; Galaxies, optical ; Redshifts ; Galaxies, photometry ; Velocity dispersion Description: The catalog of groups (file "groups.dat") is a list of 100 compact groups of galaxies identified by a systematic search of the Palomar Observatory Sky Survey red prints. Each group contains four or more galaxies, has an estimated mean surface brightness brighter than 26.0 magnitude per arcsec2 and satisfies an isolation criterion. Dynamical parameters were derived for 92 of the 100 groups, which are listed in file "dynamics.dat"; the Hubble constant was assumed to be Ho=100km/s/Mpc. Data about individual galaxies in these groups are merged into the "galaxies.dat" file; these data include photometric parameters, morphology, redshifts and absolute magnitudes originally published in four different papers. They result from CCD observations at CFHT (Canada-France-Hawaii Telescope) in 1983-1985. Redshifts were observed at the 1.5m telescope of the F.L. Whipple Observatory on Mt. Hopkins, Arizona, over the period 1984-1986, in wavelength range 470-710nm; the remaining fainter galaxies were observed with the CFHT. File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file groups.dat 72 100 Catalog of groups (1982 paper, and errata) dynamics.dat 94 92 Dynamical properties (1992 paper, table3) galaxies.dat 130 463 Photometric and Velocity data for galaxies (combined tables from 1989 and 1992 papers) morpho.dat 92 210 Morphology (1994 paper, table2)
See also: J/A+AS/117/39 : Far-IR properties of Hickson Compact Groups (Allam+, 1996) J/A+A/325/473 : HCG HI-deficiency (Huchtmeier 1997) J/AJ/123/2976 : The UZC-SSRS2 group catalog (Ramella+, 2002) Byte-by-byte Description of file: groups.dat
Bytes Format Units Label Explanations
1- 3 I3 --- HCG [1/100]+ Number of the group in this catalog 5- 6 I2 h RAh Right Ascension 1950 hours 7- 8 I2 min RAm Right Ascension minutes 9- 10 I2 s RAs Right Ascension seconds 11 A1 --- DE- Declination sign 12- 13 I2 deg DEd Declination degrees (1950) 14- 15 I2 arcmin DEm Declination arcminutes 16- 17 I2 arcsec DEs [0,60] Declination arcseconds 18 A1 --- Dyna [*] '*' when group has dynamical parameters 20- 21 A2 --- Type *Group type 22- 23 I2 --- MCount *Member count 24- 28 F5.1 arcmin AngSize *Angular size 29- 33 F5.1 mag TotMag *Total magnitude of group 34- 38 F5.1 mag Emag *Brightest member magnitude 39- 44 F6.3 --- z *? Redshift 46- 51 A6 --- Aname1 *Alternate name 1 53- 58 A6 --- Aname2 *Alternate name 2 60- 65 A6 --- Aname3 *Alternate name 3 67- 72 A6 --- Aname4 *Alternate name 4
Note on Type: Two-character code (a letter followed by a number) classifying the group according to its two brightest members: S The brightest galaxy is a spiral galaxy. E The brightest galaxy is not a spiral galaxy. 1 m(b) - m(a) ≥ 1.0 2 0.5 ≤ m(b) - m(a) < 1.0 3 m(b) - m(a) < 0.5 where m(a) and m(b) are the estimated red magnitudes of the brightest and second brightest members, respectively, of the cluster. Note on MCount: Number of galaxies in the group. Only those galaxies within three magnitudes of the brightest galaxy are counted as members. Note on AngSize: Angular diameter, in arcminutes, of the smallest circle containing the geometric centers of all group members. Note on TotMag: Total estimated red magnitude of those galaxies counted as group members (see member count, above.) Note on Emag: Estimated red magnitude of the brightest galaxy in the group, in units of magnitude. Note on z: Corrected redshift of the brightest galaxy. In all but ten cases this field is blank; prefer the group redshift supplied in the file "dynamics.dat". Note on Aname1, Aname2, Aname3, Aname4: Other designations of the group, if any (at most, four).
Byte-by-byte Description of file: dynamics.dat
Bytes Format Units Label Explanations
1- 3 I3 --- HCG [1/100]+= Group number 6- 11 F6.4 --- z Group Redshift derived from the median galaxy heliocentric velocity 14 I1 --- n Number of galaxies with accordant velocities 17- 20 F4.2 [km/s] log(sV) Radial velocity dispersion 22- 26 F5.2 [km/s] log(V) ? Estimated instrinsic 3D velocity dispersion 28- 32 F5.2 [kpc] log(R) Median projected separation 35- 39 F5.2 --- log(Ho.tc) Crossing time (expressed in 1/Ho units) 42- 46 F5.2 [g] log(Mv) ? Virial mass of group in log. scale 49- 53 F5.2 [g] log(Mp) ? Projected mass 56- 60 F5.2 [g] log(Ma) ? Average mass 63- 67 F5.2 [g] log(Mm) ? Median mass 70- 74 F5.2 [g] log(M) ? Adopted mass 77- 81 F5.2 [W] log(L) Total blue luminosity of the accordant galaxies 83- 87 F5.2 [Sun] log(M/L) ? Mass-to-light ratio 89- 94 F6.2 [g/cm3] log(rho) ? Mass density
Byte-by-byte Description of file: galaxies.dat
Bytes Format Units Label Explanations
1- 3 I3 --- HCG [1/100]+= Hickson Group number (groups.dat) 4 A1 --- m_HCG [a-i]! Galaxy in HCG group 6- 7 I2 h RAh Right Ascension B1950 (hours) 8- 9 I2 min RAm Right Ascension B1950 (minutes) 10- 14 F5.2 s RAs Right Ascension B1950 (seconds) 15 A1 --- DE- Declination B1950 (sign) 16- 17 I2 deg DEd Declination B1950 (degrees) 18- 19 I2 arcmin DEm Declination B1950 (minutes) 20- 23 F4.1 arcsec DEs Declination B1950 (seconds) 25- 29 F5.1 arcsec a Semi-major axis at 25.0mag/arcsec2 isophote 31- 34 F4.1 arcsec b Semi-minor axis at 25.0mag/arcsec2 isophote 37- 40 A4 --- MType Hubble Morphological type 42- 43 I2 --- T *Numeric morphological type 44 A1 --- morph [m] when more morphology in file "morpho.dat" 45- 49 I5 km/s RVhel ? Heliocentric velocity 51- 53 I3 km/s e_RVhel ? Estimated rms in RVhel 55 I1 --- q_RVhel *[0/2]? Confidence code on RVhel 57- 61 F5.2 mag Bmag B magnitude within 24.5mag/arcsec2 isophote 63 I1 --- q_Bmag *[0,4] Confidence level for Bmag 65- 69 F5.1 arcsec DBmag *Diameter of B=24.5mag/arcsec^2^ isophote 71- 75 F5.2 mag Rmag R magnitude within 24.0mag/arcsec2 isophote 77 I1 --- q_Rmag *[0,4] Confidence level for Rmag 79- 83 F5.1 --- DRmag *Diameter of R=24.0mag/arcsec^2^ isophote 85- 88 F4.2 mag B-R Colour within the 24.5mag/arcsec2 isophote 90- 94 F5.2 mag BTmag BT asymptotic magnitude 96-100 F5.2 mag BTc BT asymptotic magnitude corrected for internal and external extinction 102-105 F4.2 mag e_BTmag Mean error on BTmag 107-111 F5.1 mag MB-5log(h) ? Absolute magnitude of individual galaxies, h=Ho/100, Ho=Hubble constant 113-130 A18 --- Names Other names
Note on T: the morphological type codes are: --------------------------- Hubble Code RC2 --------------------------- E0-E7 0 -4, -5 S0, SB0 1 -2 S0a, SB0a 2 0 Sa, SBa 3 1 Sab, SBab 4 2 Sb, SBb 5 3 Sbc, SBbc 6 4 Sc, SBc 7 5 Scd, SBcd 8 6 Sd, SBd 9 7 Sdm, SBdm 10 8 Sm, SDm 11 9 Im, IBm 12 10 cI 13 11 --------------------------- Note on q_RVhel: the confidence code is 0 = highest confidence: spectral features clearly visible 1 = lower confidence: spectral features not clearly visible 2 = lowest confidence: very noisy spectra with no obvious features. Only 3 galaxies have q_RVhel=2. Note on q_Bmag, q_Rmag: confidence levels are: 0 = good 1 = uncertain due to overlapping isophotes 2 = uncertain due to contamination 3 = uncertain due to poor calibration 4 = uncertain due to clouds. (value 5 for HCG 64c unexplained) Note on DBmag, DRmag: the diameter is defined as sqrt(Area/π)
Byte-by-byte Description of file: morpho.dat
Bytes Format Units Label Explanations
1- 3 I3 --- HCG [1/100]+= Hickson Group number (groups.dat) 4 A1 --- m_HCG [a-i]! Galaxy in HCG group 8- 12 I5 km/s RVhel ? Heliocentric velocity 16- 19 A4 --- MType Morphological type 24- 92 A69 --- Comments *Comments
Note on Comments: Abbreviations used in comments: [string 'ansac' in 58a is unexplained] asym. = asymmetric emission = galaxy with emission lines in its nuclear spectrum IR = infrared emitter (Hickson et al. 1989ApJ...341..679H, Sulentic & de Mello Rabaca 1993ApJ...410..520S) morpho = morphology n.c.i. = nonconcentric isophotes r.c. = rotation curve radio = radio-loud galaxies (Menon & Hickson 1985; Menon 1993) tail-like= galaxy has tail-like features vel. = velocity WR = galaxy exhibits Wolf-Rayet spectral features
Remarks and Modifications: * History of Catalogue VII/85: The catalogue was originally prepared at the Centre de Donnees astronomiques, Strasbourg (CDS), in 1986. It was then received by the Astronomical Data Center (ADC), NASA Goddard Space Flight Center, in December 1986. The original tape consisted of a single text file containing the catalog data from Table 1 of Systematic Properties of Compact Groups of Galaxies, in a slightly more compact format. ADC personnel deleted eight blank columns from the end of each record in the file to reduce the record size from 80 to 72 bytes and ran a FORTRAN program to check the validity of each field according to its data type and value. Two minor typographic errors discovered in the computer-readable version were then corrected by referring to the published catalog. A possible error was also detected, but not changed, in record number 97, where the DEC seconds field contains a value of 60 (this value appears in the printed version). P. Hickson kindly supplied a list of errata including some corrections in addition to the published erratum. This list is reproduced below; the indicated changes have already been made to the catalog data. ERRATUM HCG AngSize TotMag Emag 14 6.7 12.1 13.0 22 5.0 10.5 11.1 60 2.3 13.4 14.4 69 1.9 12.2 13.1 82 3.1 12.2 13.1 HCG RAh/RAm/RAs DEd/DEm/DEs 03 00 31 39 -07 52 07 31 04 59 08 -04 19 42 74 15 17 14 +21 04 27 89 21 17 34 -04 07 17 * Catalogue VII/213 (F. Ochsenbein, CDS, 07-Jun-1999) This catalogue is a merged version of: - VII/85 (1982ApJ...255..382H), with its ReadMe description made by C.-H. Joseph Lyu [Hughes STX/NASA] on 16-Oct-1995, and of: - 1991ApJ...380...30M (absolute magnitudes) kindly supplied by Claudia Mendes de Oliveira in March 1994. - 1989ApJS...70..687H, 1992ApJ...399..353H and 1994ApJ...427..684M kindly supplied by Heinz Andernach; these tables were prepared via OCR and proofread by him in April 1995.
(End) Francois Ochsenbein [CDS] 07-Jun-1999
The document above follows the rules of the Standard Description for Astronomical Catalogues.From this documentation it is possible to generate f77 program to load files into arrays or line by line

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