Kavli Affiliate: Herman L. Marshall
| First 5 Authors: Unnati Kashyap, Unnati Kashyap, , ,
| Summary:
We report the X-ray and radio polarization study of the neutron star (NS)
low-mass X-ray binary (LMXB) GX 13+1 using the Imaging X-ray Polarimetry
Explorer (IXPE) and Very Large Array (VLA). Simultaneous Neutron Star Interior
Composition Explorer (NICER) observations show that the source was in parts of
the Z state during our IXPE observations, exhibiting moderate changes in the
hardness intensity diagram. The source exhibits X-ray dips in the light curve
along with hints of polarization swings between the dip and non-dip states. The
X-ray spectro-polarimetry results suggest a source geometry comprising an
accretion disk component representing the softer disk emission, along with a
blackbody representing the harder emission from the boundary layer (BL) or a
spreading layer (SL). We investigate the geometry of GX 13+1 by considering our
X-ray and radio polarization findings.
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