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The 1998 outburst of the X-ray transient XTE J2012+381 as observed with BeppoSAX | | S. Campana
; L. Stella
; T. Belloni
; G.L. Israel
; A. Santangelo
; F. Frontera
; M. Orlandini
; D. Dal Fiume
; | | Date: |
20 Dec 2001 | | Subject: | astro-ph | | Affiliation: | 4,5), M. Orlandini and D. Dal Fiume ( Oss. Atr. Brera; Oss. astr. Monteporzio; IFCTR-CNR Palermo; Univ. Ferrara, TESRE-CNR Bologna | | Abstract: | We report on the results of a series of X-ray observations of the transient black hole candidate XTE J2012+381 during the 1998 outburst performed with the BeppoSAX satellite. The observed broad-band energy spectrum can be described with the superposition of an absorbed disk black body, an iron line plus a high energy component, modelled with either a power law or a Comptonisation tail. The source showed pronounced spectral variability between our five observations. While the soft component in the spectrum remained almost unchanged throughout our campaign, we detected a hard spectral tail which extended to 200 keV in the first two observations, but became barely detectable up to 50 keV in the following two. A further re-hardening is observed in the final observation. The transition from a hard to a soft and then back to a hard state occurred around an unabsorbed 0.1-200 keV luminosity of 10^38 erg/s (at 10 kpc). This indicates that state transitions in XTE 2012+281 are probably not driven only by mass accretion rate, but additional physical parameters must play a role in the evolution of the outburst. | | Source: | arXiv, astro-ph/0112485 | | Services: | Forum | Review | PDF | Favorites | |
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