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Table 2

Spectral parameters of the extended nebular spectrum of T Pyx (0.2–9.0 keV).

PSHOCK1 MEKAL2
NH1 (× 1022 cm-2) 0.4 0.5
kT1 (keV) 1.0 0.6
τ1 (τ = n0t) (× 1011 s cm-3) ~3.2 N/A
K13 (× 10-5 cm-5) 0.6 0.6
NH2 (× 1022 cm-2) 11.5 17.0
kT2 (keV) 2.3< 2.2
τ2 (τ = n0t) (× 1011 s cm-3) ~2 N/A
K23 (× 10-5 cm-5) 3.5 9.8

Notes.Ranges correspond to 2σ errors (Δχ2= 3.84 – single parameter) for the first and 3σ errors (Δχ2= 6.63 – single parameter) for the second component; values of the fits are ≤1.0.

(1)

The model is (tbabs*PSHOCK+tbabs*PSHOCK); tbabs– Wilms et al. (2000), PSHOCK – Borkowski et al. (2001).

(2)

The model is (tbabs*MEKAL+tbabs*MEKAL); MEKAL – Mewe et al. (1986).

(3)

Fit normalizations; a propagated count rate error of 40% is quadratically added. The normalization constant of the MEKAL/PSHOCK plasma emission models is K = (10-14/ 4πD2) × EM where EM (emission measure) = (integration is over the emitting volume V).

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