1998A&AS..130..567K


C.D.S. - SIMBAD4 rel 1.7 - 2020.04.08CEST21:51:53

1998A&AS..130..567K - Astron. Astrophys., Suppl. Ser., 130, 567-579 (1998/June-2)

An objective and automatic cluster finder: An improvement of the matched-filter method.

KAWASAKI W., SHIMASAKU K., DOI M. and OKAMURA S.

Abstract (from CDS):

We describe an objective and automated method for detecting clusters of galaxies from optical imaging data. This method is a variant of the so-called ``matched-filter'' technique pioneered by Postman et al. (1996AJ....111..615P). Simultaneously using positions and apparent magnitudes of galaxies, this method can, not only find cluster candidates, but also estimate their redshifts and richnesses as byproducts of detection. We examine errors in the estimation of cluster's position, redshift, and richness with a number of Monte Carlo simulations. No systematic discrepancies between the true and estimated values are seen for either redshift or richness. For clusters with z=0.2 and with richness similar to that of the Coma cluster, typical errors in the estimation of position, redshift, and richness are evaluated as {DELTA}θ∼10'' (one third of the projected core radius), {DELTA}z∼0.02, and {DELTA}N/N∼12%, respectively. Spurious detection rate of the method is about less than 10% of those of conventional ones which use only surface density of galaxies. A cluster survey in the North Galactic Pole region is executed to verify the performance characteristics of the method with real data. Despite poor quality of the data, two known real clusters are successfully detected. No unknown cluster with low or medium redshift (z≤0.3) is detected. We expect these methods based on ``matched-filter'' technique to be essential tools for compiling large and homogeneous optically-selected cluster catalogs.

Abstract Copyright:

Journal keyword(s): methods: data analysis - galaxies: clustering - galaxies: clusters: individual: A 1677, 1305.4+2941

Nomenclature: Table 1: [KSD98] NN (Nos 1-18)

Status at CDS:  

Simbad objects: 23

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Number of rows : 23

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2020
#notes
1 NAME NGP reg 12 51 26.275 +27 07 41.70           ~ 1006 0
2 ACO 1656 ClG 12 59 48.7 +27 58 50           ~ 4167 2
3 [KSD98] 1 ClG 13 05 39.2 +30 51 36           ~ 1 0
4 [KSD98] 2 ClG 13 05 43.3 +28 58 33           ~ 1 0
5 [KSD98] 3 ClG 13 05 47.5 +31 14 39           ~ 1 0
6 [KSD98] 4 ClG 13 05 48.8 +28 47 34           ~ 1 0
7 [KSD98] 5 ClG 13 05 49.3 +28 37 04           ~ 1 0
8 ACO 1677 ClG 13 05 52.6 +30 54 06           ~ 47 0
9 [KSD98] 6 ClG 13 05 59.5 +29 08 05           ~ 1 0
10 [KSD98] 7 ClG 13 06 03.6 +31 20 40           ~ 1 0
11 [KSD98] 8 ClG 13 06 07.2 +29 45 37           ~ 1 0
12 [KSD98] 9 ClG 13 06 13.6 +28 56 36           ~ 1 0
13 [KSD98] 10 ClG 13 06 25.2 +28 51 37           ~ 1 0
14 [KSD98] 11 ClG 13 06 52.1 +29 10 10           ~ 1 0
15 [KSD98] 12 ClG 13 07 06.1 +28 58 40           ~ 1 0
16 [KSD98] 13 ClG 13 07 17.4 +29 07 11           ~ 1 0
17 Z 1305.4+2941 G 13 07 47.06 +29 25 23.0           ~ 12 0
18 ZwCl 1305+2941 ClG 13 07 49.25 +29 25 48.3     18.00 16.34   ~ 33 0
19 [KSD98] 14 ClG 13 08 25.8 +29 26 45           ~ 1 0
20 [KSD98] 15 ClG 13 09 18.8 +28 40 45           ~ 1 0
21 [KSD98] 16 ClG 13 10 02.6 +30 55 20           ~ 1 0
22 [KSD98] 17 ClG 13 10 07.3 +31 06 20           ~ 1 0
23 [KSD98] 18 ClG 13 10 55.9 +30 37 48           ~ 1 0

    Equat.    Gal    SGal    Ecl

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2020.04.08-21:51:53

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