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J/other/NewA/58.61  SDSS DR9 galaxy clusters optical catalog   (Banerjee+, 2018)

An optical catalog of galaxy clusters obtained from an Adaptive Matched Filter Finder applied to SDSS DR9 Data. Banerjee P., Szabo T., Pierpaoli E., Franco G., Ortiz M., Oramas A., Tornello B. <New Astron., 58, 61-71 (2018)> =2018NewA...58...61B (SIMBAD/NED BibCode)
ADC_Keywords: Surveys ; Clusters, galaxy ; Galaxies, optical Keywords: cosmology: galaxies - clusters: optical - catalogs Abstract: We present a new galaxy cluster catalog constructed from the Sloan Digital Sky Survey Data Release 9 (SDSS DR9) using an Adaptive Matched Filter (AMF) technique. Our catalog has 46479 galaxy clusters with richness Λ200>20 in the redshift range 0.045≤z<0.641 in ∼11500 deg2 of the sky. Angular position, richness, core and virial radii and redshift estimates for these clusters, as well as their error analysis, are provided as part of this catalog. In addition to the main version of the catalog, we also provide an extended version with a lower richness cut, containing 79368 clusters. This version, in addition to the clusters in the main catalog, also contains those clusters (with richness 10<Λ200<20) which have a one-to-one match in the DR8 catalog developed by Wen et al (WHL). We obtain probabilities for cluster membership for each galaxy and implement several procedures for the identification and removal of false cluster detections. We cross-correlate the main AMF DR9 catalog with a number of cluster catalogs in different wavebands (Optical, X-ray). We compare our catalog with other SDSS-based ones such as the redMaPPer (Rykoff et al., 2014, Cat. J/ApJ/785/104, 26350 clusters) and the Wen et al. (WHL, 2012, Cat. J/ApJS/199/34) (132684 clusters) in the same area of the sky and in the overlapping redshift range. We match 97% of the richest Abell clusters (Richness group 3), the same as WHL, while redMaPPer matches ∼90% of these clusters. Considering AMF DR9 richness bins, redMaPPer does not have one-to-one matches for 70% of our lowest richness clusters (20<Λ200<40), while WHL matches 54% of these missed clusters (not present in redMaPPer). redMaPPer consistently does not possess one-to-one matches for ∼20% AMF DR9 clusters with Λ200>40, while WHL matches ≥70% of these missed clusters on average. For comparisons with X-ray clusters, we match the AMF catalog with BAX, MCXC and a combined catalog from NORAS and REFLEX. We consistently obtain a greater number of one-to-one matches for X--ray clusters across higher luminosity bins (Lx>6x1044erg/s) than redMaPPer while WHL matches the most clusters overall. For the most luminous clusters (Lx>8), our catalog performs equivalently to WHL. This new catalog provides a wider sample than redMaPPer while retaining many fewer objects than WHL. Description: The data is derived from Data Release 9 of SDSS using an Adaptive Matched Filter technique, which is adaptable to future deeper optical surveys. File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file clusters.dat 98 46479 Cluster catalog (corrected by CDS) errors.dat 81 34825 Errors associated with the clusters (where applicable)
See also: J/ApJS/199/34 : Clusters of galaxies in SDSS-III (Wen+, 2012) J/ApJ/785/104 : redMaPPer. I. Algorithm applied to SDSS DR8 (Rykoff+, 2014) Byte-by-byte Description of file: clusters.dat
Bytes Format Units Label Explanations
1- 5 I5 --- ID AMF DR9 Cluster ID 7- 10 A4 --- --- [AMF9] 12- 27 A16 --- AMF9 AMF DR9 Cluster Name (JHHMMSS.s+DDMMSS) 29- 36 F8.4 deg RAdeg Right Ascension in decimal degrees (J2000) 38- 45 F8.4 deg DEdeg Declination in decimal degrees (J2000) 47- 52 F6.4 --- z Cluster redshift 54- 62 F9.4 --- Lk Cluster likelihood 64- 71 F8.4 --- Lambda200 Cluster richness 73- 77 F5.3 --- r200 Cluster R200 value 79- 83 F5.3 --- rc Core radius of the cluster 85- 90 F6.3 --- c Concentration parameter of the cluster 92- 98 F7.4 --- str-rh Richness order of the cluster within its stripe
Byte-by-byte Description of file: errors.dat
Bytes Format Units Label Explanations
1- 5 I5 --- ID AMF DR9 Cluster ID 7- 14 F8.4 % rh68 ? Richness error (68% confidence interval) (in %) 15 A1 --- n_rh68 [i] i for -infinity 17- 24 F8.4 % rh95 ? Richness error (95%) (in %) 25 A1 --- n_rh95 [i] i for -infinity 27- 34 F8.4 % rc68 Core radius error (68%) (in %) 36- 43 F8.4 % rc95 Core radius error (95%) (in %) 45- 52 F8.4 % z68 Redshift error (68%) (in %) 54- 61 F8.4 % z95 Redshift error (95%) (in %) 63- 71 F9.4 % pos68 Error in centering (68%) (in %) 73- 81 F9.4 % pos95 Error in centering (95%) (in %)
Acknowledgements: Panchajanya Banerjee, panchajb(at)
(End) Patricia Vannier [CDS] 08-Aug-2017
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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