Candidate mHz QPOs detected in GX 3+1 at 7-15 mHz with 0.51-1.41% rms, one surviving global significance, occurring at higher luminosities than in other NS LMXBs.
Low-energy line emission from Cygnus X-2 observed with the BeppoSAX LECS
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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.
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Evidence for Millihertz Oscillations in the bright atoll source GX 3+1
Candidate mHz QPOs detected in GX 3+1 at 7-15 mHz with 0.51-1.41% rms, one surviving global significance, occurring at higher luminosities than in other NS LMXBs.