J/ApJ/579/93 KPNO/Deeprange distant cluster survey (Postman+, 2002)
The KPNO/Deeprange distant cluster survey.
I. The catalog and the space density of intermediate-redshift clusters.
Postman M., Lauer T.R., Oegerle W., Donahue M.
<Astrophys. J. 579, 93 (2002)>
=2002ApJ...579...93P 2002ApJ...579...93P
ADC_Keywords: Clusters, galaxy ; Galaxy catalogs ; Redshifts
Keywords: catalogs - galaxies: clusters: general -
large-scale structure of universe
Abstract:
We have conducted an automated search for galaxy clusters within a
contiguous 16deg2 I-band survey in the north Galactic hemisphere. A
matched filter detection algorithm identifies 444 cluster candidates
in the range 0.2≲z≲1.2. The full catalog is presented along with the
results from a follow-up spectroscopic survey.
Description:
The imaging phase of the survey was conducted in the I-band using the
prime focus CCD camera on the KPNO Mayall 4-m telescope. The
observations were conducted over a 2-yr period between 1994 January
and 1996 March.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table2.dat 82 444 Deeprange Cluster Catalog
table4.dat 78 351 Galaxy Redshifts
table5.dat 24 38 Cluster redshifts
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See also:
J/A+AS/116/203 : The redshift catalogue for galaxy clusters (Stein+, 1996)
J/ApJS/102/289 : CNOC cluster redshift survey catalogs. II. (Yee+, 1996)
J/ApJS/113/1 : CNOC cluster redshift survey catalogs. III. (Ellingson+ 1997)
J/ApJS/116/211 : CNOC cluster redshift survey catalogs. IV. (Yee+ 1998)
J/ApJS/116/231 : CNOC cluster redshift survey catalogs. V. (Abraham+ 1998)
J/ApJS/116/247 : CNOC cluster redshift survey catalogs. VI. (Ellingson+ 1998)
Byte-by-byte Description of file: table2.dat
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Bytes Format Units Label Explanations
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1- 3 I3 --- [PLO2002] Deeprange survey cluster ID number (G1) (1)
5- 6 I2 h RAh Hour of Right Ascension (J2000)
8- 9 I2 min RAm Minute of Right Ascension (J2000)
11- 15 F5.2 s RAs Second of Right Ascension (J2000)
17 A1 --- DE- Sign of the Declination (J2000)
18- 19 I2 deg DEd Degree of Declination (J2000)
21- 22 I2 arcmin DEm Arcminute of Declination (J2000)
24- 27 F4.1 arcsec DEs Arcsecond of Declination (J2000)
29- 32 F4.2 --- z Estimated redshift
34- 38 F5.1 --- Lambda The ΛCL value (2)
40- 43 F4.1 --- NA0.25 Number of galaxies within a 333/h75kpc
radius that lie within m3 and m3+2 (3)
45- 48 F4.1 --- Ne0.25 Abell-like richness estimate computed over the
magnitude range meff to meff+2 within a
333/h75kpc radius
50- 54 F5.1 --- NA0.50 Number of galaxies within a 666/h75kpc
radius that lie with in m3 and m3+2 (4)
56- 60 F5.1 --- Ne0.50 Abell-like richness estimate computed over the
magnitude range meff to meff+2 within a
666/h75kpc radius (4)
62- 65 F4.1 --- sigma Significance of the detection
67- 69 I3 arcsec Rad Effective radius
71- 74 F4.1 mag m3 The statistically selected 3rd brightest
cluster galaxy
76- 79 F4.1 mag meff The apparent magnitude at which the cluster
is maximally enhanced over the background
field (5)
81 A1 --- Qual Visually assigned quality flag for all
candidates with Lambda ≥50 (6)
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Note (1): Candidate with a detection significance of 2σ or greater.
Note (2): The effective number of L* galaxies in the cluster and within
the cutoff radius of the radial filter.
Note (3): A statistical background subtraction, derived from galaxy counts
in survey regions with no detected cluster candidates, is applied.
Note (4): A statistical background subtraction, derived from galaxy
counts in survey regions with no detected cluster candidates, is
applied. But with m3 derived for the central 333/h75kpc region.
Note (5): Derived by the matched filter algorithm.
Note (6): Quality flags:
1: The detection does not appear to have a strong central
concentration of galaxies and may very well be spurious, a poor
group, or deblended substructure from a nearby rich cluster. Use
of the visual quality flag is meant for non-statistical analyses only.
2: The cluster candidate is likely to be real but may also be a
compact group.
3: The cluster candidate is almost certainly real - a substantial
galaxy enhancement is seen and the galaxies exhibit a pronounced
central concentration similar to spectroscopically confirmed
clusters at similar redshifts.
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Byte-by-byte Description of file: table4.dat
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Bytes Format Units Label Explanations
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1- 2 A2 --- --- [CL]
3- 5 I3 --- [PLO2002] Cluster identification number (G1)
7- 8 I2 --- Gal Galaxy number (G1)
10 A1 --- f_Gal [*] Indicates used in the computation of the
mean cluster redshift
12- 13 I2 h RAh Hour of Right Ascension (J2000)
15- 16 I2 min RAm Minute of Right Ascension (J2000)
18- 22 F5.2 s RAs Second of Right Ascension (J2000)
24 A1 --- DE- Sign of the Declination (J2000)
25- 26 I2 deg DEd Degree of Declination (J2000)
28- 29 I2 arcmin DEm Arcminute of Declination (J2000)
31- 34 F4.1 arcsec DEs Arcsecond of Declination (J2000)
36- 40 F5.2 mag Imag The I band magnitude
42- 47 F6.4 --- z ? Heliocentric redshift
49- 51 I3 km/s e_z ? Observational error in the Redshift
53- 77 A25 --- Comments Additional comments
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Byte-by-byte Description of file: table5.dat
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Bytes Format Units Label Explanations
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1- 2 A2 --- --- [CL]
4- 6 I3 --- [PLO2002] Cluster number (G1)
7 A1 --- m_[PLO2002] [AB] Multiplicity index on [PLO2002]
9- 14 F6.4 --- z ? Mean redshift
15 A1 --- n_z [?+] Note on z (1)
17 I1 --- Ngal ? Number of galaxies used to compute the
cluster redshift
19- 20 I2 --- Nz Number of galaxy redshifts measured
22- 23 I2 --- Nspec Number of spectra extracted.
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Note (1): Note on Redshift:
+: redshifts that have a maximum spread in the individual galaxy
redshifts that exceeds the nominal 3000km/s limit.
?: redshifts based on fewer than three galaxies and may not be very reliable
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Global notes:
Note (G1): In Simbad, clusters are identified as [PLO2002] NNNA,
galaxies are identified as [PLO2002] NNN NN
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History:
From electronic version of the journal
(End) Greg Schwarz [AAS], Patricia Bauer [CDS] 13-Jan-2003