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Evolution of Hard X-Ray Spectra Along the Branches in Cir X-1 | | G. Q. Ding
; J. L. Qu
; T. P. Li
; | | Date: |
5 Sep 2003 | | Journal: | Astrophys.J. 596 (2003) L219-L222 | | Subject: | astro-ph | | Abstract: | Using the data from the PCA and HEXTE on board the RXTE satellite, we investigate the evolution of the 3-200 keV spectra of the peculiar low mass X-ray binary (LMXB) Cir X-1 along the branches on its hardness-intensity diagram (HID) from the vertical horizontal branch (VHB), through the horizontal horizontal branch (HHB) and normal branch (NB), to the flaring branch (FB). We detect a power-law hard component in the spectra. It is found that the derived photon indices ($Gamma$) of the power-law hard component are correlated with the position on the HID. The power-law component dominates the X-ray emission of Cir X-1 in the energy band higher than $sim 20$ keV. The fluxes of the power-law component are compared with those of the bremsstrahlung component in the spectra. A possible origin of the power-law hard component is discussed. | | Source: | arXiv, astro-ph/0309173 | | Services: | Forum | Review | PDF | Favorites | |
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