2001A&A...368..776R


C.D.S. - SIMBAD4 rel 1.7 - 2019.10.21CEST08:42:19

2001A&A...368..776R - Astronomy and Astrophysics, volume 368, 776-786 (2001/3-4)

Finding galaxy clusters using Voronoi tessellations.

RAMELLA M., BOSCHIN W., FADDA D. and NONINO M.

Abstract (from CDS):

We present an objective and automated procedure for detecting clusters of galaxies in imaging galaxy surveys. Our Voronoi Galaxy Cluster Finder (VGCF) uses galaxy positions and magnitudes to find clusters and determine their main features: size, richness and contrast above the background. The VGCF uses the Voronoi tessellation to evaluate the local density and to identify clusters as significative density fluctuations above the background. The significance threshold needs to be set by the user, but experimenting with different choices is very easy since it does not require a whole new run of the algorithm. The VGCF is non-parametric and does not smooth the data. As a consequence, clusters are identified irrespective of their shape and their identification is only slightly affected by border effects and by holes in the galaxy distribution on the sky. The algorithm is fast, and automatically assigns members to structures. A test run of the VGCF on the PDCS field centered at α=13h26m and δ=+29°52' (J2000) produces 37 clusters. Of these clusters, 12 are VGCF counterparts of the 13 PDCS clusters detected at the 3σ level and with estimated redshifts from z=0.2 to z=0.6. Of the remaining 25 systems, 2 are PDCS clusters with confidence level <3σ and redshift z≤0.6. Inspection of the 23 new VGCF clusters indicates that several of these clusters may have been missed by the matched filter algorithm for one or more of the following reasons: a) they are very poor, b) they are extremely elongated, c) they lie too close to a rich and/or low redshift cluster.

Abstract Copyright:

Journal keyword(s): cosmology: large-scale structure of Universe - galaxies: clusters: general - galaxies: statistics

Nomenclature: Table 1: [RBF2001] VNN (Nos V1-V37).

Simbad objects: 37

goto Full paper

goto View the reference in ADS

Number of rows : 37

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2019
#notes
1 PDCS 15 ClG 02 30 21.0 +00 26 21           ~ 5 0
2 [RBF2001] V35 ClG 08 54.4 +30 05           ~ 1 0
3 [RBF2001] V23 ClG 08 56.1 +29 41           ~ 1 0
4 [RBF2001] V24 ClG 08 57.4 +29 27           ~ 1 0
5 [RBF2001] V37 ClG 08 59.0 +30 06           ~ 1 0
6 [RBF2001] V15 ClG 09 04.7 +29 55           ~ 1 0
7 [RBF2001] V7 ClG 09 05.7 +29 47           ~ 1 0
8 [RBF2001] V6 ClG 09 21.1 +30 17           ~ 1 0
9 [RBF2001] V14 ClG 09 25.6 +29 34           ~ 1 0
10 [RBF2001] V3 ClG 09 26.2 +29 30           ~ 1 0
11 [RBF2001] V30 ClG 09 28.1 +30 13           ~ 1 0
12 [RBF2001] V11 ClG 09 29.9 +30 22           ~ 1 0
13 [RBF2001] V20 ClG 09 30.9 +29 39           ~ 1 0
14 [RBF2001] V13 ClG 09 32.9 +29 56           ~ 1 0
15 [RBF2001] V19 ClG 09 36.2 +29 51           ~ 1 0
16 [RBF2001] V18 ClG 09 38.2 +29 27           ~ 1 0
17 [RBF2001] V5 ClG 09 41.7 +30 03           ~ 1 0
18 [RBF2001] V22 ClG 09 44.0 +30 21           ~ 1 0
19 [RBF2001] V25 ClG 09 50.2 +29 51           ~ 1 0
20 [RBF2001] V33 ClG 09 52.0 +30 08           ~ 1 0
21 [RBF2001] V29 ClG 09 56.1 +29 30           ~ 1 0
22 [RBF2001] V27 ClG 09 56.5 +29 33           ~ 1 0
23 [RBF2001] V26 ClG 09 56.5 +30 11           ~ 1 0
24 [RBF2001] V32 ClG 10 06.3 +30 09           ~ 1 0
25 PDCS 62 ClG 13 23 39.0 +30 22 26           ~ 10 0
26 ClG 1321+2949 ClG 13 23 44.8 +29 34 13           ~ 6 0
27 PDCS 47 ClG 13 23 45.4 +29 23 04           ~ 4 0
28 RCS J132348+3003.4 ClG 13 23 47.3 +30 03 30           ~ 10 0
29 ClG 1322+3028 ClG 13 24 20.700 +30 12 40.30           ~ 19 0
30 PDCS 53 ClG 13 25 01.1 +29 43 05           ~ 5 0
31 ClG 1323+2953 ClG 13 25 32.9 +29 38 25           ~ 6 0
32 ACO 1739 ClG 13 26 14 +29 26.4           ~ 9 0
33 ClG 1324+2948 ClG 13 26 24.1 +29 32 58           ~ 6 0
34 ClG 1324+3014 ClG 13 26 25.7 +29 58 19           ~ 7 0
35 ClG 1324+3015 ClG 13 27 17 +29 59.5           ~ 6 0
36 PDCS 46 ClG 13 27 20.5 +29 22 14           ~ 2 0
37 ClG 1325+3021 ClG 13 27 39.7 +30 06 11           ~ 4 0

    Equat.    Gal    SGal    Ecl

To bookmark this query, right click on this link: simbad:objects in 2001A&A...368..776R and select 'bookmark this link' or equivalent in the popup menu


2019.10.21-08:42:19

© Université de Strasbourg/CNRS

    • Contact