X-ray spectral study of hot gas in three clusters of galaxies

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Volume 513 (April 2010)

A&A, 513 (2010) A2

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Table 3:

Best-fit parameters for spectra of the 3 $^\prime$ around the centre of the galaxy clusters.
Parameter	J1539(XMM-Newton)^a,b	J1539(Chandra)^a	J1601^a	J0812
Background scaling factor	0.99 $\pm$ 0.02	0.976 $\pm$ 0.013	-
Hydrogen column density ( ${\rm 10^{24}}$ $\ensuremath{{\rm m^{-2}}}$ )	20.0 $\pm$ 0.4 ( $\pm$ 0.2)	17.2 $\pm$ 1.3	6.6 $\pm$ 0.4 ( $\pm$ 0.3)	29 $\pm$ 2
Hydrogen 21 $\ensuremath{{\rm cm}}$ column density^d ( ${\rm 10^{24}}$ $\ensuremath{{\rm m^{-2}}}$ )	8.38	8.38	6.25	22.1
Emission measure^c (10⁷³ $\ensuremath{{\rm m^{-3}}}$ )	2.57 $\pm$ 0.04 ( $\pm$ 0.01)	2.44 $\pm$ 0.07	9.2 $\pm$ 0.2 ( $\pm$ 0.2)	2.80 $\pm$ 0.16
Temperature (keV)^e	3.03 $\pm$ 0.15 ( $\pm$ 0.08)	3.50 $\pm$ 0.11	8.24 $\pm$ 0.58 ( $\pm$ 0.97)	3.2 $\pm$ 0.2
$1/\alpha$ ^f	0.48 $\pm$ 0.09 ( $\pm$ 0.03)	0.48 (fixed)	-	-
Fe abundance	0.61 $\pm$ 0.03 ( $\pm$ 0.02)	0.57 $\pm$ 0.07	0.58 $\pm$ 0.10 ( $\pm$ 0.06)	0.37 $\pm$ 0.10
Si/Fe abundance	0.65 $\pm$ 0.12 ( $\pm$ 0.01)	-	-	-
Ni/Fe abundance	2.81 $\pm$ 0.56 ( $\pm$ 0.02)	-	-	-
Flux (0.1-2.4 $\ensuremath{{\rm keV}}$ ) [ ${\rm 10^{-14}}$ $\ensuremath{{\rm W~m^{-2}}}$ ]	1.03 $\pm$ 0.02 ( $\pm$ 0.01)	1.03 $\pm$ 0.03	0.99 $\pm$ 0.02 ( $\pm$ 0.02)	0.66 $\pm$ 0.04
Flux (2-10 $\ensuremath{{\rm keV}}$ ) [ ${\rm 10^{-14}}$ $\ensuremath{{\rm W~m^{-2}}}$ ]	1.11 $\pm$ 0.02 ( $\pm$ 0.04)	1.23 $\pm$ 0.03	1.70 $\pm$ 0.04 ( $\pm$ 0.13)	0.88 $\pm$ 0.05
C-stat / d.o.f.	270/229	389/295	252/224	-
$\chi^{2}$ / d.o.f.	-	-	-	189/134

Notes. ^(a) The first quoted uncertainty is the statistical uncertainty on the value. The uncertainty between parentheses is due to the uncertainty in background estimation (Sect. 3.1.2). ^(b) For this source, we fitted a ``wdem'' model. ^(c) The emission measure is defined as $Y=\int n_{{\rm e}} n_{{\rm H}} {\rm d}V$ , see also Sect. 3.3. ^(d) Deduced from the 21 $\ensuremath{{\rm cm}}$ map by Dickey & Lockman (1990). ^(e) For wdem: ``mean temperature'', see Eq. (3). ^(f) As defined in Eq. (1).

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