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Low-energy line emission from Cygnus X-2 observed with the BeppoSAX LECS | | E. Kuulkers
; A. N. Parmar
; A. Owens
; T. Oosterbroek
; U. Lammers
; | | Date: |
2 Jun 1997 | | Subject: | astro-ph | | Affiliation: | 1 and 2), A. N. Parmar , A. Owens , T. Oosterbroek , U. Lammers ( ESA/ESTEC, Univ. of Oxford | | Abstract: | We present a 0.2-10 keV spectrum of the low-mass X-ray binary Cygnus X-2 obtained using the Low Energy Concentrator Spectrometer on-board Bepposax. The spectrum can be described by a cut-off power-law model with absorption of (2.28 +/- 0.07) 10^{21} atoms/cm^2, a power-law index of 0.78 +/- 0.02 and a cut-off energy of 4.30 +/- 0.08 keV (68% confidence errors), except at energies near ~1 keV where excess emission is present. This can be modeled by a broad Gaussian line feature with an energy of 1.02 +/- 0.04 keV, a full width half-maximum of 0.47 +/- 0.07 keV and an equivalent width of 74 +/-^{25}_{11} eV. This result confirms earlier reports of line emission near 1 keV and shows the intensity and structure of the feature to be variable. | | Source: | arXiv, astro-ph/9706009 | | Other source: | [GID 184087] astro-ph/9706009 | | Services: | Forum | Review | PDF | Favorites | |
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