Kavli Affiliate: Herman L. Marshall
| First 5 Authors: Unnati Kashyap, Thomas J. Maccarone, Mason Ng, Eliot C. Pattie, Swati Ravi
| Summary:
We report the first X-ray polarimetric results of the neutron star (NS)
low-mass X-ray binary (LMXB) Z-source GX 349+2 using the Imaging X-ray
Polarimetry Explorer (IXPE). We discovered that the X-ray source was polarized
at PD = 1.1 +/- 0.3% (1-sigma errors) with a polarization angle of PA = 32 +/-
6 degree (1-sigma errors). Simultaneous Nuclear Spectroscopic Telescope Array
(NuSTAR) observations show that the source transitioned through the normal
branch (NB), flaring branch (FB), and soft apex (SA) of the Z-track during our
IXPE observations. The X-ray spectro-polarimetry results suggest a source
geometry comprising an accretion disk component, a blackbody representing the
emission from the NS surface, and a Comptonized component. We discuss the
accretion geometry of the Z source in light of the spectro-polarimetric
results.
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