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Table 3

Spectral parameters of the best-fit models to the rate-resolved spectra of IGR J18245–2452 during the blue states.

Ratea 30–50 50–75 75–100 >100 cts/s
N H 45 ± 8 40 ± 6 46 ± 7 41 ± 6 × 1020 cm-2
k T in 0.119 0.127 0.127 0.142 keV
85 69 96 70 km
E Fe 6.9 ± 0.3 6.4 ± 0.2 6.6 ± 0.3 6.6 ± 0.2 keV
σ Fe 1.0– 1.0– 1.3 0.9 keV
N Fe 8 ± 2 10 ± 2 10 11 × 10-4 cm-2 s-1
Γ 1.55 ± 0.02 1.472 ± 0.013 1.42 ± 0.02 1.375
k T nthComp 0.24 ± 0.04 0.27 ± 0.03 0.26 ± 0.31 keV
N nthComp 2.7 ± 0.3 3.9 ± 0.4 5.4 ± 0.6 6.6 ± 0.5 × 10-2
Exp1b 3.2 5.3 3.8 2.8 ks
Exp2b 8.3 11.6 11.0 7.3 ks
Fluxc 2.23 ±  0.01 3.49 ±  0.02 5.13 ±  0.03 7.86 ±  0.05 × 10-10 erg cm-2 s-1
/d.o.f.d 1.051/1090 1.012/1569 0.940/1722 1.048/1782
E 3 e 2.21 ± 0.05 2.26 ± 0.02 2.24 ± 0.02 2.258 ± 0.015 keV
N 3 e 5.1 ± 3.4 1.3 ± 0.5 2.0 ± 0.7 4.1 ± 0.9 × 10-4 cm-2 s-1

Notes.

(a)

EPIC-pn count rate in the 0.5–11 keV energy range. The time selection is operated on the EPIC-pn lightcurves binned at 200 s.

(b)

Exp1 and Exp2 are the EPIC-pn exposures during obs1 and obs2.

(c)

The absorbed flux is computed from the EPIC-pn spectrum of obs2 in the 0.5–10 keV range (uncertainties are only statistical).

(d)

The intercalibration constants between the instruments varied within a limited range (± 10%).

(e)

Feature introduced to account for calibration problems.

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