First simultaneous multi-wavelength observations of the black hole candidate IGR J17091−3624 - ATCA, INTEGRAL, Swift, and RXTE views of the 2011 outburst

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Table 2

Results of the spectral fits to the joint Swift/XRT and INTEGRAL/ISGRI (and JEM-X in I1 and I1′) spectra.

Spectra	Model	N_H	kT_bb/kT_inj	Γ/τ	E_cut/kT_e		Unabs. Flux^*
		( × 10²² cm^-2)	(keV)		(keV)	(d.o.f.)	0.5–10 keV	3–9 keV	20–200 keV


S1+I1	CPL	1.08 ± 0.08		1.40 ± 0.07		0.90 (89)	8.4	4.5	20.0
	ThC		0.2 (frozen)	0.8 ± 0.3		1.00 (89)	8.5	4.3	17.2
I1′	CPL	1.1 frozen		1.49 ± 0.09		1.0 (34)	NA	6.5	22.4
	ThC	1.1 frozen	0.2 (frozen)	0.8 ± 0.2		1.0 (34)	NA	7.2	22.3
S2+I2	CPL	1.15 ± 0.06		1.54 ± 0.05		1.1 (137)	12.1	6.0	20.8
	ThC	1.13 ± 0.05	0.2 (frozen)			1.2 (137)	11.7	6.0	25.9
S3+I3	DPL	1.5 ± 0.1	1.2 ± 0.2	2.3 ± 0.3		1.3 (128)	38.2	11.4	7.3
S4+I4^°	DPL	1.16 ± 0.05				1.2 (409)	31.6	12.4	2.1

Notes. Errors are at the 90% level.

^(*)

In units of 10^-10 erg cm^-2 s^-1. Fluxes are normalised to Swift/XRT, except I1′ normalised to ISGRI.

^(°)

Observations made more than a day apart. Norm. constant is high and poorly constrained ( ≳ 2).

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