ORCID Profile
0000-0001-9739-367X
Current Organisation
University of British Columbia
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Publisher: American Astronomical Society
Date: 23-10-2023
Publisher: Oxford University Press (OUP)
Date: 03-1997
Publisher: Oxford University Press (OUP)
Date: 23-02-2018
DOI: 10.1093/MNRAS/STY482
Publisher: American Astronomical Society
Date: 21-11-2012
Publisher: Springer Science and Business Media LLC
Date: 07-12-2018
Publisher: Zenodo
Date: 2021
Publisher: American Astronomical Society
Date: 11-11-2013
Publisher: Oxford University Press (OUP)
Date: 13-04-2006
Publisher: Oxford University Press (OUP)
Date: 05-1996
Publisher: American Astronomical Society
Date: 08-2023
Abstract: This paper reports the first detection of polarization in the X-rays for atoll-source 4U 1820−303, obtained with the Imaging X-ray Polarimetry Explorer (IXPE) at 99.999% confidence level (CL). Simultaneous polarimetric measurements were also performed in the radio with the Australia Telescope Compact Array. The IXPE observations of 4U 1820−303 were coordinated with Swift X-ray Telescope, Neutron Star Interior Composition Explorer, and Nuclear Spectroscopic Telescope Array aiming to obtain an accurate X-ray spectral model covering a broad energy interval. The source shows a significant polarization above 4 keV, with a polarization degree of 2.0% ± 0.5% and a polarization angle of −55° ± 7° in the 4–7 keV energy range, and a polarization degree of 10% ± 2% and a polarization angle of −67° ± 7° in the 7–8 keV energy bin. This polarization also shows a clear energy trend with polarization degree increasing with energy and a hint for a position-angle change of ≃90° at 96% CL around 4 keV. The spectro-polarimetric fit indicates that the accretion disk is polarized orthogonally to the hard spectral component, which is presumably produced in the boundary/spreading layer. We do not detect linear polarization from the radio counterpart, with a 3 σ upper limit of 50% at 7.25 GHz.
Publisher: Zenodo
Date: 2021
Publisher: American Astronomical Society
Date: 13-01-2012
Location: United Kingdom of Great Britain and Northern Ireland
Location: United Kingdom of Great Britain and Northern Ireland
Location: United States of America
Location: United States of America
No related grants have been discovered for Jeremy Heyl.