Kavli Affiliate: Herman L. Marshall
| First 5 Authors: Unnati Kashyap, Unnati Kashyap, , ,
| Summary:
We report the first polarimetric results of the neutron star (NS) low-mass
X-ray binary (LMXB) Z-source GX 17+2 using the Imaging X-ray Polarimetry
Explorer (IXPE) and the Very Large Array (VLA). We find that the X-ray source
was polarized at PD = 1.9 +/- 0.3 % (1-sigma errors) with a polarization angle
of PA = 11 +/- 4 degree (1-sigma errors). Simultaneous Nuclear Spectroscopic
Telescope Array (NuSTAR) observations show that the source was in the normal
branch (NB) during our IXPE observations. The X-ray spectro-polarimetry results
suggest a source geometry comprising an accretion disk component, a
Comptonization component, and a reflection component. The VLA radio
polarization study shows a PD = 2.2 +/- 0.2 % with a Faraday-corrected
intrinsic polarization angle of 1 +/- 5 degree, which is an indication of the
jet axis. Thus, we find the estimated X-ray PA from the source is consistent
with the radio PA. We discuss the accretion geometry of the Z-source in light
of our X-ray spectro-polarimetry and radio findings.
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