XRISM Resolve measured an ionization parameter of ~3, column density ~10^21 cm^-2, and ~100 km/s blueshift in highly ionized Fe absorption lines from Cygnus X-1, with equivalent widths of 2.3 eV (He-like K-alpha) and 0.4-1.2 eV (H-like Ly-alpha) during dipping.
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XRISM observations reveal orbital-phase-dependent variability in highly ionized iron absorption lines and tentative short-term changes on few-second timescales in Cygnus X-1, indicating structural variations in the stellar wind.
citing papers explorer
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XRISM High-Resolution X-ray Spectroscopy of Cygnus X-1 -- highly ionized Iron absorption structures
XRISM Resolve measured an ionization parameter of ~3, column density ~10^21 cm^-2, and ~100 km/s blueshift in highly ionized Fe absorption lines from Cygnus X-1, with equivalent widths of 2.3 eV (He-like K-alpha) and 0.4-1.2 eV (H-like Ly-alpha) during dipping.
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XRISM High-Resolution X-ray Spectroscopy of Cygnus X-1 -- Orbital and Short-Term Variability of Iron Absorption
XRISM observations reveal orbital-phase-dependent variability in highly ionized iron absorption lines and tentative short-term changes on few-second timescales in Cygnus X-1, indicating structural variations in the stellar wind.