INTEGRAL observations of Scorpius X-1: evidence for Comptonization up to 200 keV

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Table 1

INTEGRAL/IBIS/ISGRI observations of Sco X-1.

			compTT		PEGPW

Start of observation	Livetime^a	MJD	KT_e (keV)	Flux^b	Γ	Flux^c	Flux^d	^e

31/07/2003	4.92	52 852.008						0.6/0.8
11/08/2003	1.47	52 863.709						0.8/0.6
12.008/08/2003	4.94	52 864.008						0.5/0.7
12.137/08/2003	1.55	52 864.137						0.6/0.6
13/08/2003	4.38	52 865.010						0.4/0.4
15/02/2004	9.42	53 051.100						0.5/0.5
27/08/2004	1.64	53 245.377						1.4/1.7
12/03/2005	1.22	53 442.603						1.0/0.9
19/09/2005	1.21	53 633.054				<0.05^f		1.4^g
21/02/2006	3.80	53 788.124						1.1/1.2
22/02/2006	4.21	53 789.041						1.6/1.8
20/03/2006	3.76	53 815.102						1.0/1.1
08/02/2010	3.53	55 236.060						1.6/1.6
09/02/2010	3.60	55 237.176						1.0/0.9

Notes.Uncertainties at 90% confidence level for the derived parameters of the model applied.

^(a)

IBIS livetime in units of 10⁴ s.

^(b)

Flux of the thermal component in the 20–50 keV band in units of 10^-9 erg cm^-2 s^-1.

^(c)

Flux of the nonthermal component the 50–200 keV band in units of 10^-10 erg cm^-2 s^-1.

^(d)

Flux of a comptt model applied at the 50–200 keV band in units of 10^-10 erg cm^-2 s^-1.

^(e)

model=comptt+pegpw/model=comptt+comptt (see text).

^(f)

3σ upper limit on the (pegpw) flux.

^(g)

model=comptt alone: 50–200 keV component is absent (see text).

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