New X-ray supernova remnants in NGC 7793 | Astronomy & Astrophysics (A&A)

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Table 3.

XMM-Newton spectral modelling.

Name	$N_{H}^{local}$ ${N_{\mathrm{H}}^{\mathrm{local}}}$	kT	norm	χ_ν² (χ²/d.o.f.)	F_X	F_X^ISMcor(F_X^cor)	L_X	L_X^ISMcor(L_X^cor)
	10²² cm⁻²	keV	10⁻⁴		10⁻¹⁵ erg cm⁻² s⁻¹	10⁻¹⁵ erg cm⁻² s⁻¹	10³⁶ erg s⁻¹	10³⁶ erg s⁻¹
(1)	(2)	(3)	(4)	(5)	(6)	(7)	(8)	(9)
XSPEC model: tbabs ×phabs × ∑vapec
X11	0.48 $_{- 0.30}^{+ 0.35}$ $_{-0.30}^{+0.35}$	0.13 ± 0.04	1.5 $_{- 1.5}^{+ 102.0}$ $_{-1.5}^{+102.0}$	1.19 (58.69/49)	3.35 $_{- 3.35}^{+ 0.01}$ $_{-3.35}^{+0.01}$	3.96 (5.05)	5.49 $_{- 5.49}^{+ 0.01}$ $_{-5.49}^{+0.01}$	6.49 (8.27)
X15	0.46 $_{- 0.24}^{+ 0.34}$ $_{-0.24}^{+0.34}$	< 0.12	8.5 $_{- 8.1}^{+ 58}$ $_{-8.1}^{+58}$	0.95 (50.51/53)	3.92 ± 1.8	4.38(32.7)	6.42 ± 2.94	7.17 (53.6)
		0.78 $_{- 0.13}^{+ 0.09}$ $_{-0.13}^{+0.09}$	0.03 $_{- 0.01}^{+ 0.02}$ $_{-0.01}^{+0.02}$
X42a	0.21 $_{- 0.19}^{+ 0.30}$ $_{-0.19}^{+0.30}$	0.23 ± 0.04	0.09 $_{- 0.05}^{+ 0.42}$ $_{-0.05}^{+0.42}$	1.32 (68.89/52)	3.87 $_{- 3.60}^{+ 0.01}$ $_{-3.60}^{+0.01}$	4.36 (9.71)	6.34 $_{- 5.89}^{+ 0.41}$ $_{-5.89}^{+0.41}$	7.14(15.8)

Notes. In Column 1, we provide the name of the source spectrum. Columns 2 to 4 list the best-fit component values: the local absorption and the temperature of the thermal plasma and its normalisation, respectively. The Galactic column density towards NGC 7793 is fixed to a value of 3.4 × 10²⁰ atoms cm⁻². The normalisation of the thermal component is expressed in units of $\frac{10^{- 14}}{4 π D^{2}} \int n_{e} n_{H} d V$ $\frac{10^{-14}}{4\pi D^2} \int n_{\mathrm{e}} n_{\mathrm{H}} \, dV$ , where n_e and n_H are the electron and hydrogen densities, respectively, integrated over the emitting region’s volume, V, and D represents the source distance in centimetres (Smith et al. 2001). In Column 5, we present the values of the χ² statistic. Columns 6 and 7 provide the absorbed 0.5–7.0 keV flux and the corrected values (for only the ISM and total absorption), respectively. Columns 8 and 9 contain the corresponding luminosity values. Errors are quoted at the 1σ confidence level. The adopted distance to NGC 7793 is 3.7 Mpc. aThe abundances of the following elements were left free to vary: Ne = $2 . 21_{- 0.88}^{+ 1.27}$ $2.21^{+1.27}_{-0.88}$ , Mg = $2 . 94_{- 2.78}^{+ 4.08}$ $2.94^{+4.08}_{-2.78}$ ; a Gaussian line was added to the model with the best-fit parameters LineE = 1.03 ± 0.02 keV and norm = $(1 . 66_{- 1.11}^{+ 1.29}) \times 10^{- 7}$ $(1.66^{+1.29}_{-1.11}) \times 10^{-7}$ .

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