Kavli Affiliate: Eric Miller
| Summary:
We present the high-resolution X-ray spectrum of the Z-source Cygnus X-2, obtained with X-Ray Imaging and Spectroscopy Mission (XRISM). The observations have enabled a precise characterization of the Fe-K emission lines from the accretion disk corona (ADC) and a possible detection of an ultra-fast outflow (UFO). The ADC component has at least two distinct regions. The Fe-K emission lines are remarkably broad, with a velocity dispersion of $σ_v=2300^+900_-700$~km~s$^-1$. This can be larger than what was observed in previous Chandra observations ($1120pm870$~km~s$^-1$) and recent XRISM observations of the similar Z-source GX 340+0 (360–800~km~s$^-1$). Furthermore, we marginally detect a blueshifted absorption feature, which we identify as either ionFe26 or ionFe25, with outflow velocities of $-0.29c$ or $-0.26c$, respectively. The mass loss rate is $dotMsim10^-8M_odot,mathrmyr^-1$. Our findings suggest that the ADC in Cyg X-2 has a kinematically active environment with a high degree of turbulence and kinetic energy.
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