RX J0440.9 + 4431: a persistent Be/X-ray binary in outburst

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Table 3

Best fit parameters for the absorbed bmc with exponential cut-off model for the broad band spectral fits of the 2010 outburst (uncertainties are at 90% c.l.).

	April 2010^a	September 2010^b

N_H [10²²cm^-2]	0.31 ± 0.02
E_Fold [keV]
kT_BB [keV]	1.38 ± 0.02
α	0.50 ± 0.07	0.78 ± 0.12
log ₁₀A	> 2.15	0.8
^c	0.030	0.019 ± 0.002
r_BB^d [km]	2.64 ± 0.12	2.13 ± 0.16
E_Gauss [keV]	6.33
A_Gauss	(6.6 ± 1.3) × 10^-4
	1.55 ± 0.02	0.632 ± 0.008
		0.73 ± 0.03
C_JEM − X2		0.80 ± 0.02
Flux_2−30 keV^e	3.78 ± 0.01	1.272 ± 0.009
Flux_{0.1−200 keV}^f	3.4	2.9
/d.o.f.	1.24/571	0.93/559

Notes.

^(a)

Observation A in Table 2.

^(b)

Observation S in Table 2.

^(c)

L₃₉ is the X-ray luminosity in units of 10³⁹ erg/s, D₁₀ the source distance in units of 10 kph.

^(d)

Quantity derived from N_BMC and kT_BB.

^(e)

Flux of the RXTE/PCA observation in units of 10^-9 erg cm^-2 s^-1.

^(f)

Estimated de-absorbed flux in units of 10^-9 erg cm^-2 s^-1, normalized to the Swift/XRT observations.

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