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VII/213 Hickson's Compact groups of Galaxies (Hickson+ 1982-1994)
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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
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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 arcsec^2^ 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:
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FileName Lrecl Records Explanations
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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)
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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)
Byte-by-byte Description of file: groups.dat
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Bytes Format Units Label Explanations
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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
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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).
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Byte-by-byte Description of file: dynamics.dat
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Bytes Format Units Label Explanations
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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
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Byte-by-byte Description of file: galaxies.dat
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Bytes Format Units Label Explanations
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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/arcsec^2^ isophote
31- 34 F4.1 arcsec b Semi-minor axis at 25.0mag/arcsec^2^ 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/arcsec^2^ 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/arcsec^2^ 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/arcsec^2^ isophote
90- 94 F5.2 mag BTmag B_T_ asymptotic magnitude
96-100 F5.2 mag BTc B_T_ 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
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Note on T: the morphological type codes are:
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Hubble Code RC2
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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
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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/{pi})
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Byte-by-byte Description of file: morpho.dat
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Bytes Format Units Label Explanations
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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
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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
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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
* History of 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 <coliveira@eso.org> 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.
* 28-Jul-1999 Gail L. Schneider [SSDOO/ADC]
Wendell Shuster reported the following errata in the galaxies.dat file.
In the alternate name column for row:
HCG 005 b: currently reads "N1905" -- should read "N190S" as in "South."
HCG 059 d: currently reads "1737" -- should read "I737" as in "Index
Catalogue"
Corrections have been made to the file.
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(End) Francois Ochsenbein [CDS] 07-Jun-1999