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Two spectral states of the transient X-ray burster SAX J1747.0-2853 | | L. Natalucci
; A. Bazzano
; M. Cocchi
; P. Ubertini
; R. Cornelisse
; J. Heise
; J.J.M. in ’t Zand
; | | Date: |
10 Dec 2003 | | Journal: | Astron.Astrophys. 416 (2004) 699-702 | | Subject: | astro-ph | | Abstract: | The neutron star binary SAX J1747.0-2853, located in the Galactic Center region at about 0.5 deg from Sgr A* and at a distance of 9 kpc, has been observed in outburst four times (1998, 1999, 2000 and 2001) by BeppoSAX and RossiXTE. At the time of its discovery in 1998 the source was observed in a low/hard state, showing a hard tail with a high energy cutoff of 70 keV. About two years later the source reappeared about one order of magnitude brighter in the X-rays (0.5-10 keV) and with a significantly steeper spectrum. As was the case for the low state, the data could be fitted by an input model based on two continuum primary components: a) a soft thermal excess, which is ~4 times more luminous than the one found in hard state; b) a non-thermal component which is compatible with either a power-law or a comptonization spectrum. The soft component is equally well described by pure blackbody or multi-color disk emission, with significantly higher temperature than observed in low state (~1.3 vs. the ~0.5 keV assuming pure blackbody). For this model, the flux of the non-thermal component below ~10 keV is a significant fraction of the total X-ray flux, i.e. greater than ~50% in the 2-10 keV band. | | Source: | arXiv, astro-ph/0312259 | | Services: | Forum | Review | PDF | Favorites | |
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