2004MNRAS.351..989B

Query : 2004MNRAS.351..989B

2004MNRAS.351..989B - Mon. Not. R. Astron. Soc., 351, 989-996 (2004/July-1)

The XMM-Newton/2dF survey - III. Comparison between optical and X-ray cluster detection methods.

BASILAKOS S., PLIONIS M., GEORGAKAKIS A., GEORGANTOPOULOS I., GAGA T., KOLOKOTRONIS V. and STEWART G.C.

Abstract (from CDS):

We directly compare X-ray and optical techniques of cluster detection by combining Sloan Digital Sky Survey photometric data with a wide-field (∼1.6 deg2) XMM-Newton survey near the North Galactic Pole region. The optical cluster detection procedure is based on merging two independent selection methods: a smoothing + percolation technique and a matched filter algorithm. The X-ray cluster detection is based on a wavelet-based algorithm, incorporated in the Science Analysis System (sas) v.5.3 package. The final optical sample counts nine candidate clusters with estimated Automatic Plate Measuring like richness of more than 20 galaxies, while the X-ray based cluster candidates total four. Three out of these four X-ray cluster candidates are also optically detected. We argue that the cause is that the majority of the optically detected clusters are relatively poor X-ray emitters, with X-ray fluxes fainter than the flux limit (for extended sources) of our survey, fx (0.3-2 keV) ≃ 2x10–14 erg/cm2/s.

Abstract Copyright: 2004 RAS

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

Simbad objects: 1

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Number of rows : 1
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2026 		#notes
1 NAME NGP reg 12 51 26.275 +27 07 41.70           ~ 1274 0

Query : 2004MNRAS.351..989B

Basic data :
NAME NGP -- Region defined in the Sky
Other object types: otypes_help 		reg ([SFD98])
ICRS coord. (ep=J2000) : 		12 51 26.275 +27 07 41.70 [ ] D ~
FK4 coord. (ep=B1950 eq=1950) : 		12 49 00.000 +27 23 59.81 [ ]
Gal coord. (ep=J2000) : 		328.040682 +89.999997 [ ]
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Identifiers (3) :
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NAME NGP NAME North Galactic Pole [SFD98] J1251+2708

References (1274 between 1850 and 2026) (Total 1274)
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