J/AN/321/101 Compact groups of galaxies in LCRS (Allam+, 2000)
Compact groups of galaxies in the Las Campanas Redshift Survey.
Allam S.S., Tucker D.L.
<Astron. Nachrichten, 321, 101-114 (2000)>
=2000AN....321..101A 2000AN....321..101A
ADC_Keywords: Galaxy catalogs ; Surveys ; Redshifts ; Clusters, galaxy
Keywords: catalogs - surveys - galaxies
Abstract:
We have recently extracted a catalog of compact groups of galaxies
(CGs) from the Las Campanas Redshift Survey. This catalog of Las
Campanas Compact Groups (LCCGs) contains 76 CGs with a median redshift
of zmed∼0.08. The physical properties of these CGs are similar to
those form Hickson (1982, Cat. VII/213) and the Barton et al.
(1996AJ....112..871B 1996AJ....112..871B) catalogs. Here, we present an atlas of our
catalog and briefly describe its general properties.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table2.dat 79 76 The main properties of the Las Campanas Compact
Groups (LCCGs)
table3.dat 46 253 Compact Group Members
atlas/* . 76 Individual postscript atlas images of all the
Las Campanas Compact Groups
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See also:
VII/213 : Hickson's Compact groups of Galaxies (Hickson+ 1982-1994)
VII/203 : Las Campanas Redshift Survey (Shectman+ 1996)
J/ApJS/130/237 : LCRS loose groups of galaxies (Tucker+, 2000)
J/ApJS/137/117 : Las Campanas Distant Cluster Survey (LCDCS) (Gonzales+, 2001)
J/MNRAS/327/588 : Las Campanas/AAT Rich Cluster Survey - I (Pimbblet+, 2001)
Byte-by-byte Description of file: table2.dat
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Bytes Format Units Label Explanations
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1- 2 I2 --- LCCG Group identification number
5- 6 I2 h RAh Group's right ascension (1950)
8- 9 I2 min RAm Group's right ascension (1950)
11- 15 F5.2 s RAs Group's right ascension (1950)
17 A1 --- DE- Group's declination sign (1950)
18- 19 I2 deg DEd Group's declination (1950)
21- 22 I2 arcmin DEm Group's declination (1950)
24- 27 F4.1 arcsec DEs Group's declination (1950)
29- 34 F6.4 --- zcmb Group's redshift
36 I1 --- Ntot Group's number of group member galaxies
38- 41 F4.2 Mpc RP Group's mean pairwise separation (in Mpc/h)
43- 46 F4.2 Mpc Rh Group's harmonic radius (in Mpc/h)
48- 55 E8.2 solLum Ltot Group's LCRS R-band total luminosity (1)
57- 60 F4.2 --- Lrat Observed-to-total luminosity correction factor
62- 67 F6.4 deg ThetaG Radius of the smallest circle including
all members
69- 74 F6.4 Mpc RG Radius of the smallest circle including
all members (in Mpc/h)
76 I1 --- Type [1/2] The type of CG (2)
78- 79 A2 --- Notes [ab ] Comments (3)
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Note (1): Group's LCRS R-band total luminosity, corrected for galaxies outside
the LCRS's photometric limits. (Since several other group catalogs
have photometry in the de Vaucouleurs B0 band, it is useful to note
this rough conversion relation: LLCRS∼1.1LB0)
Ltot is in solLum/h2.
Note (2): Type of field in which the group sits:
1: a 50-fiber field
2: a 112-fiber field
Note (3): Notes to the group:
a: the group's barycenter is closer than 2RP (pairwise separation) to
a slice edge
b: the group contains at least one 55-arcsec 'orphan' with a mock redshift
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Byte-by-byte Description of file: table3.dat
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Bytes Format Units Label Explanations
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1- 2 I2 --- LCCG Group identification number
3 A1 --- m_LCCG Member designation (1)
5- 6 I2 h RAh Member's right ascension (1950)
8- 9 I2 min RAm Member's right ascension (1950)
11- 15 F5.2 s RAs Member's right ascension (1950)
17 A1 --- DE- Member's declination sign (1950)
18- 19 I2 deg DEd Member's declination (1950)
21- 22 I2 arcmin DEm Member's declination (1950)
24- 27 F4.1 arcsec DEs Member's declination (1950)
29- 33 F5.2 mag Rmag Member's LCRS R-band isophotal magnitude
35- 39 I5 km/s Vel Member's velocity (2)
41- 44 F4.2 --- zphot Photometric redshift
46 A1 --- Spectrum [cebm] Qualitative description of the group
member's spectrum (3)
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Note (1): Letter "a" represents the brightest group member, letter "b"
the second brightest group member, and so on.
Note (2): In generating catalog, each 55-arcsec 'orphan' was assigned
a mock velocity equal to the gaussian-convolved velocity of
its nearest neighbor (a gaussian of σ=200km/s was used);
this mock velocity is listed in this column for 55-arcsec 'orphan'
group members.
Note (3): Qualitative description of the group member's spectrum:
c: a "continuum" spectrum (i.e., a spectrum with no strong emission
line features)
e: a spectrum containing strong emission lines
b: a spectrum which shows both absorption lines (as in a continuum
spectrum) and weak emission lines
m: a 55-arcsec 'orphan' with a mock redshift
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Acknowledgements:
Sahar Allam , Douglas Tucker
(End) Francois Ochsenbein [CDS] 15-Jan-2002