Kavli Affiliate: Deepto Chakrabarty
| First 5 Authors: Daniele Rogantini, Jeroen Homan, Richard M. Plotkin, Maureen van den Berg, James Miller-Jones
| Summary:
In low-mass X-ray binaries (LMXBs), accretion flows are often associated with
either jet outflows or disk winds. Studies of LMXBs with luminosities up to
roughly 20% of the Eddington limit indicate that these outflows generally do
not co-occur, suggesting that disk winds might inhibit jets. However, previous
observations of LMXBs accreting near or above the Eddington limit show that
jets and winds can potentially coexist. To investigate this phenomenon, we
carried out a comprehensive multi-wavelength campaign (using VLA, Chandra/HETG,
and NICER) on the near-Eddington neutron-star Z source LMXB GX 13+1. NICER and
Chandra/HETG observations tracked GX 13+1 across the entire Z-track during high
Eddington rates, detecting substantial resonance absorption features
originating from the accretion disk wind in all X-ray spectra, which implies a
persistent wind presence. Simultaneous VLA observations captured a variable
radio jet, with radio emission notably strong during all flaring branch
observations-contrary to typical behavior in Z-sources-and weaker when the
source was on the normal branch. Interestingly, no clear correlation was found
between the radio emission and the wind features. Analysis of VLA radio light
curves and simultaneous Chandra/HETG spectra demonstrates that an ionized disk
wind and jet outflow can indeed coexist in GX 13+1, suggesting that their
launching mechanisms are not necessarily linked in this system.
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