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Home All issues Volume 507 / No 3 (December I 2009) A&A, 507 3 (2009) 1257-1270 Full HTML
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Table 3:

Spectral index of radio halos.
Name $\alpha$1 $\alpha$2 Temperature Reference
       keV  
Straight >3 points      
A1914 $\alpha_{0.26}^{1.4}$ = 1.88   7.9 1
A2256 $\alpha_{0.22}^{1.4}$ = 1.61   6.6 7
1E 0657 $\alpha_{0.84}^{5.9}$ = 1.3   10.6 10

Steepening 		>3 points      
A1656 $\alpha_{0.31}^{1.4}$ = 1.16 $\alpha_{1.4}^{4.8}$ = 2.28 8.4 11

Straight 		3 points      
A521 $\alpha_{0.24}^{1.4}$ = 1.8   5.9 *
RXC J2003 $\alpha_{0.2}^{1.4}$ = 1.3   - 4

Steepening 		3 points      
A754 $\alpha_{0.07}^{0.3}$ = 1.1 $\alpha_{0.3}^{1.4}$ = 1.5 9.5 1
A2163 $\alpha_{0.3}^{1.3}$ = 1.1 $\alpha_{1.3}^{1.6}$ = 1.5 13.3 5
A2319 $\alpha_{0.4}^{0.6}$ = 0.9 $\alpha_{0.6}^{1.4}$ = 2.2 8.8 8
A3562 $\alpha_{0.3}^{0.8}$ = 1.3 $\alpha_{0.8}^{1.4}$ = 2.1 5.2 9

2 points      
A545 $\alpha_{1.3}^{1.6} > 1.4$   5.5 1
A665 $\alpha_{0.3}^{1.4}$ = 1.0   9.0 3
A697 $\alpha_{0.3}^{1.4}$ = 1.2   10.2 *
A1300 $\alpha_{0.3}^{1.4}$ = 1.8   9.2 4
A2218 $\alpha_{1.4}^{5.0}$ = 1.6   7.1 3
A2219 $\alpha_{0.3}^{1.4}$ = 0.9   12.4 2
A2255 $\alpha_{0.3}^{1.4}$ = 1.7   6.9 6
A2744 $\alpha_{0.3}^{1.4}$ = 1.0   10.1 2

Notes: Temperature is the average cluster temperature in keV from literature data.
References to spectral index information: * = this work; 1 = Bacchi et al. (2003); 2 = Orrú et al. (2007); 3 = Giovannini & Feretti (2000); 4 = Venturi et al. (2009); 5 = Feretti et al. (2001); 6 = Govoni et al. (2005); 7 = Brentjens (2008); 8 = Feretti et al. (1997); 9 = Venturi et al. (2003); 10 = Liang et al. (2000); 11 = Thierbach et al. (2003).

Source LaTeX | All tables | In the text

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