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SIGMA and XTE observations of the soft X-ray transient XTEJ1755-324 | | P.Goldoni
; M.Vargas
; A.Goldwurm
; J.Paul
; V. Borrel
; E.Jourdain
; L. Bouchet
; J.-P.Roques
; M.Revnivtsev
; E. Churazov
; M. Gilfanov
; R.Sunyaev
; A.Dyachkov
; N. Khavenson
; I. Tserenin
; N.Kuleshova
; | | Date: |
20 Aug 1998 | | Subject: | astro-ph | | Affiliation: | 1,2), M.Vargas , A.Goldwurm , J.Paul , V. Borrel , E.Jourdain , L. Bouchet , J.-P.Roques , M.Revnivtsev , E. Churazov (4,5), M. Gilfanov (4,5), R.Sunyaev (4,5), A.Dyachkov , N. Khavenson , I. Tserenin , N.Kuleshova ( SAp/Saclay, ISDC/Geneve, CESR/T | | Abstract: | We present observations of the X-ray transient XTEJ1755-324 performed during summer 1997 with the XTE satellite and with the SIGMA hard X-ray telescope onboard the GRANAT observatory. The source was first detected in soft X-rays with XTE on July 25 1997 with a rather soft X-ray spectrum and its outburst was monitored in soft X-rays up to November 1997. On September 16 it was first detected in hard X-rays by the French soft gamma ray telescope SIGMA during a Galactic Center observation. The flux was stronger on September 16 and 17 reaching a level of about 110 mCrab in the 40-80 keV energy band. On the same days the photon index of the spectrum was determined to be alpha =-2.3 +/- 0.9 (1 sigma error) while the 40-150 keV luminosity was about 8 x 10^{36} erg/s for a distance of 8.5 kpc. SIGMA and XTE results on this source indicate that this source had an ultrasoft-like state during its main outburst and a harder secondary outburst in September. These characteristics make the source similar to X-Nova Muscae 1991, a well known black hole candidate. | | Source: | arXiv, astro-ph/9808211 | | Services: | Forum | Review | PDF | Favorites | |
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