J/A+A/396/397 Deep cluster survey in Chandra archival data (Boschin+, 2002)
A deep cluster survey in Chandra archival data. First results.
Boschin W.
<Astron. Astrophys., 396, 397-409 (2002)>
=2002A&A...396..397B 2002A&A...396..397B
ADC_Keywords: Clusters, galaxy ; X-ray sources
Keywords: cosmology: large-scale structure of Universe -
galaxies: clusters: general - X-rays: galaxies: clusters
Abstract:
I present the first results of a search for clusters of galaxies in
Chandra ACIS pointed observations at high galactic latitude with
exposure times larger than 10ks. The survey is being carried out
using the Voronoi Tessellation and Percolation technique, which is
particularly suited for the detection and accurate quantification of
extended and/or low surface brightness emission in X-ray imaging
observations. A new catalogue of 36 cluster candidates has been
created from 5.55deg2 of surveyed area. Five of these candidates have
already been associated to visible enhancements of the projected
galaxy distribution in low deepness DSS-II fields and are probably
low-to moderate redshift systems. Three of the candidates have been
identified in previous ROSAT-based surveys. I show that a
significative fraction (30-40%) of the candidate clusters are probably
intermediate to high redshift systems. In this paper I publish the
catalogue of these first candidate clusters. I also derive the number
counts of clusters and compare it with the results of deep ROSAT-based
cluster surveys.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 49 36 The cluster catalogue
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See also:
B/chandra : The Chandra Archive Log (CXC, 1999-)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 2 I2 --- [B2002c] Sequential number
4- 11 F8.4 deg RAdeg Right ascension in decimal degrees (J2000)
13- 20 F8.4 deg DEdeg Declination in decimal degrees (J2000)
22- 28 E7.2 mW/m2 FX X-ray flux
30- 36 E7.2 mW/m2 e_FX rms uncertainty on FX
38- 41 F4.1 arcsec r Estimated characteristic radius
43- 47 F5.2 --- S/N Signal-to-noise ratio
49 A1 --- Note Note (1)
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Note (1): Notes as follows:
1 = z=0.4 cluster (No 97, Vikhlinin et al., 1998, J/ApJ/502/558)
2 = z=0.16 cluster (RIXOS F258-101, Mason et al. 2000, J/MNRAS/311/456)
3 = cluster MS 1358.4+6245 at z=0.328
P = flux uncertain due to the presence of a nearby pointlike source
B = source very close to the border of the X-ray image
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History:
From electronic version of the journal
(End) Patricia Vannier [CDS] 02-May-2006