J/AJ/128/1017 Northern Optical Cluster Survey. IV. (Lopes+, 2005)
The northern sky optical cluster survey. IV. An intermediate-redshift galaxy
cluster catalog and the comparison of two detection algorithms.
Lopes P.A.A., De Carvalho R.R., Gal R.R., Djorgovski S.G., Odewahn S.C.,
Mahabal A.A., Brunner R.J.
<Astron. J., 128, 1017-1045 (2004) + Erratum 130, 2434 (2005)>
=2004AJ....128.1017L 2004AJ....128.1017L
ADC_Keywords: Clusters, galaxy ; Surveys ; Redshifts
Keywords: galaxies: clusters: general - methods: numerical - surveys
Abstract:
We present an optically selected galaxy cluster catalog from
2700°2 of the digitized Second Palomar Observatory Sky Survey
(DPOSS), spanning the redshift range 0.1~<z~<0.5, providing an
intermediate-redshift supplement to the previous DPOSS cluster survey.
This new catalog contains 9956 cluster candidates and is the largest
resource of rich clusters in this redshift range to date.
Description:
This paper presents a galaxy cluster catalog that is an extension of
those presented in Papers II (Gal et al., 2003, Cat. J/AJ/125/2064)
and III (Gal et al., 2005, in prep.). It covers 2700°2 of
digitized Second Palomar Observatory Sky Survey (DPOSS) data and is
expected to be complete for rich clusters out to z∼0.3, with clusters
still detected to z∼0.5.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 71 9956 The Northern Sky Cluster Catalog Supplemental
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See also:
J/AJ/125/2064 : Northern Optical Cluster Survey. II. (Gal+, 2003)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 4 A4 --- --- [NSCS] (1)
6- 19 A14 --- Name Cluster name (1)
21- 29 F9.5 deg RAdeg Right ascension in decimal degrees (J2000)
32- 39 F8.5 deg DEdeg Declination in decimal degrees (J2000)
41- 44 F4.2 --- zAK ? Adaptive kernel redshift estimate (2)
46- 49 F4.2 --- zVT ? Voronoi tessellation redshift estimate (2)
52- 56 F5.1 --- NgalAK Adaptive kernel richness estimate (3)
59- 63 F5.1 --- NgalVT Voronoi tessellation richness estimate
65- 67 I3 --- PNum Plate number
69- 71 A3 --- Code Cluster retrieval code (4)
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Note (1): Where the convention is NSCS Jhhmmss+ddmmss
(the second "S" in the name stands for supplemental).
Note (2): Entries are set to zero whenever the corresponding estimator
failed or if the candidate was not detected by that algorithm.
The few candidates with redshift estimates greater than 0.6 (fewer
than 40 clusters for each algorithm) are blank and have their richness
set to zero.
Note (3): A few other candidates with the richness estimate greater than 400
(fewer than 10 clusters on each case) have their richness set to zero.
Note (4): Cluster retrieval code are defined as follows:
A = Adaptive kernel (AK) code;
V = Voronoi tessellation (VT) code;
AV = Both AK and VT code;
* = Cluster candidate found within 500 arcseconds of the plate edges
(nearly 2 times the size of the initial kernel for the AK).
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History:
* 26-Jan-2005: First version with NSCS names truncated as Jhhmm+ddmm
(i.e. without seconds), leading to amgibuous names
* 21-Sep-2005: Version corrected, with longer (and unambiguous) NSCS names
according to the Erratum published in vol. 130, p. 2434 (2005)
References:
Gal et al., Paper I 2000AJ....119...12G 2000AJ....119...12G
Gal et al., Paper II 2003AJ....125.2064G 2003AJ....125.2064G (Cat. J/AJ/125/2064)
(End) Greg Schwarz [AAS], Marianne Brouty [CDS] 26-Jan-2005