1998A&A...340..343W

Query : 1998A&A...340..343W

1998A&A...340..343W - Astronomy and Astrophysics, volume 340343-350 (1998/12-2)

The large-scale diffuse X-ray emission surrounding quasars: an investigation using the scaling-index method.

WILLIAMS K.A., BRINKMANN W. and WIEDEMANN G.

Abstract (from CDS):

The large-scale (∼20') diffuse x-ray background surrounding a sample of quasars observed during ROSAT PSPC pointed observations is studied using a new source-detection algorithm, the scaling-index method. This algorithm, which can identify individual photons as belonging to a source or background, is useful for detecting faint, extended sources in noisy fields. Using this method, we find that, contrary to conclusions drawn by others, there is scant evidence for preferential enhancement of x-ray backgrounds surrounding radio-loud quasars by foreground x-ray emitting clusters of galaxies. Rather, all fluctuations in these backgrounds can be explained by varying levels of emission from a galactic thermal plasma of temperature T≃0.14keV. No difference is observed between the diffuse x-ray backgrounds of radio-loud and radio-quiet quasars.

Abstract Copyright: ∼

Journal keyword(s): methods: data analysis - galaxies: quasars: general - cosmology: large-scale structure of Universe - X-rays: general

Simbad objects: 32

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Number of rows : 32
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 QSO J0018+1629 QSO 00 18 31.9990789848 +16 29 25.835460180   19 18.26 18.40   ~ 40 0
2 QSO B0044-2059 QSO 00 46 51.8262708456 -20 43 28.522745040   18.7 19.00     ~ 19 0
3 QSO B0049-295 QSO 00 51 53.0718541632 -29 14 59.464695840   19.4 19.45     ~ 14 0
4 QSO B0052-2830 QSO 00 54 59.1450396672 -28 14 30.384478032   20.4       ~ 12 0
5 QSO B0053-2840 QSO 00 55 43.3822678584 -28 24 09.054003888   20.9       ~ 15 0
6 QSO B0054-2748 QSO 00 57 24.5027046048 -27 32 00.808346040   19.5       ~ 17 0
7 QSO B0121+0327 QSO 01 24 33.1554500304 +03 43 34.207125384     18.5     ~ 18 0
8 QSO B0122+0338 QSO 01 24 57.5700676152 +03 53 48.455108340   17.73 17.73     ~ 23 0
9 QSO J0125-0006 Bla 01 25 28.8438355224 -00 05 55.930595964   16.92 16.64 16.30   ~ 305 1
10 QSO B0123-0034 QSO 01 26 02.2069043568 -00 19 24.183775020   19.16 18.90     ~ 40 0
11 QSO J0139+1753 QSO 01 39 41.97916961 +17 53 07.5498125     18.5     ~ 71 1
12 ICRF J013957.3+013146 Sy1 01 39 57.30577668 +01 31 46.1387932   17.12 17.07     ~ 178 1
13 QSO B0207-1016 QSO 02 09 54.8377337928 -10 02 22.753332924   20.91 19.94     ~ 9 0
14 [VV96] J034155.9-441637 QSO 03 41 55.9096855632 -44 16 37.805135232   19.5       ~ 8 0
15 3C 208 QSO 08 53 08.6093021736 +13 52 54.845406984   17.76 17.42     ~ 257 1
16 3C 212 QSO 08 58 41.44702653 +14 09 44.7622845   19.96 19.06     ~ 257 1
17 4C 54.18 QSO 09 10 11.1437894352 +54 27 23.592465864     17.5 17.050   ~ 35 1
18 4C 39.27 QSO 09 41 04.0018191264 +38 53 50.928526860   18.20 18.13     ~ 113 1
19 3C 254 QSO 11 14 38.7251836992 +40 37 20.329281156   17.62 17.42     ~ 331 2
20 QSO B1115+080A QSO 11 18 16.951 +07 45 58.23   16.61 16.44     ~ 703 2
21 Ton 1388 Sy1 11 19 08.6786220240 +21 19 17.987085948   14.91 14.80     ~ 492 0
22 PB 3047 QSO 11 36 55.0199147328 +29 51 31.147974972   19.13 18.98     ~ 33 0
23 7C 1218+3359 QSO 12 20 33.8756544048 +33 43 12.026168040   18.80 18.61     ~ 271 1
24 QSO B1351-018 Bla 13 54 06.89532721 -02 06 03.1904962   20.62 19.91 19.277   ~ 177 1
25 LEDA 50824 Sy1 14 13 48.3306274368 +44 00 14.003371296   14.99 14.99     ~ 402 0
26 QSO B1556+335 Bla 15 58 55.1864381376 +33 23 18.608916984   18.22 17.79 17.6   ~ 115 1
27 QSO J1719+4804 Bla 17 19 38.2496454120 +48 04 12.247659408   15.33 14.60 14.25   ~ 186 1
28 QSO B2159-1916 QSO 22 02 30.0582585504 -19 01 51.307530132   18.8       ~ 7 0
29 3C 446 BLL 22 25 47.25929101 -04 57 01.3907626   18.83 18.39 16.3   ~ 863 1
30 QSO B2223-0517 QSO 22 26 17.1304536576 -05 02 34.225452276     18.6     ~ 17 0
31 3C 454.3 Bla 22 53 57.7480438728 +16 08 53.561508864   16.57 16.10 15.22   ~ 3004 2
32 MCG-02-58-022 Sy1 23 04 43.4776098480 -08 41 08.629476864   16.20 15.91 9.4   ~ 481 1

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