Table 3.
Linear dependence of spectral parameters on X-ray flux.
| Parameters | a [keV] or | b(d) | Pearson |
|---|---|---|---|
| no dimension | corr. coeff. | ||
| Ecyc(a) [keV] | 36.24 ± 0.09 | 0.675 ± 0.075 | 0.98 |
| σcyc(b) [keV] | 5.30 ± 0.09 | 0.41 ± 0.07 | 0.99 |
| Strength (c) | 7.28 ± 0.22 | 1.15 ± 0.19 | 0.96 |
| Opt. depth τ(c) | 0.54 ± 0.02 | 0.042 ± 0.015 | 0.87 |
| σcyc/Ecyc | 0.146 ± 0.002 | 0.0086 ± 0.0002 | 0.97 |
| Ecut [keV] | 20.17 ± 0.06 | 0.30 ± 0.06 | 0.74 |
| Efold [keV] | 9.83 ± 0.04 | 0.24 ± 0.03 | 0.79 |
| Γ | 0.965 ± 0.002 | 0.015 ± 0.001 | 0.53 |
Notes. The five line parameters are the centroid energy Ecyc, the width σcyc, the line strength, the optical depth τ (see Eq. (2)), and the relative width σcyc/Ecyc. The three continuum parameters are Ecut and Efold and the power-law photon index Γ. The X-ray flux is measured in units of (ASM-cts s−1), referring to the All Sky Monitor of (RXTE): y = a + b(x − c). Here, the offset in x is always constant: c = 5.0 (ASM-cts s−1) (close to the center of the range of fluxes observed). We note that 5.0 (ASM-cts s−1) corresponds to 5.0 × 0.237 = 1.18 (keV cm−2 s) in (2−10 keV). Uncertainties are at the 1 sigma (68%) level. The last column lists the Pearson linear correlation coefficients.
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