What is recorded here?
Taverna and colleagues used IXPE to measure phase-averaged X-ray polarization from magnetar 4U 0142+61. They found about 12 ± 1% across 2–8 keV, with different polarization behavior at lower and higher energies and an approximately 90-degree angle change across the intervening band.
Source-linked catalogue note. A detailed explanatory guide has not yet been prepared for this entry.
Scientific scope
The observed polarization is not an unambiguous direct detection of QED vacuum birefringence: the authors explicitly state that the energy- and phase-integrated polarization is insufficient to establish that effect alone. Their surface, atmosphere and magnetospheric scenarios are model-dependent and not unique; geometric angles are poorly constrained. The 4–5 keV polarization lies below instrumental sensitivity, so the angle there is poorly determined. Alternative processing analyzes the same IXPE observation and is not independent replication. The supplement describes normally distributed Stokes parameters as correlated in one sentence and uncorrelated in another; this literal inconsistency needs source-version and calculation reconciliation rather than silent correction. The individual contributor list shown here is incomplete.
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People and systems
Roberto Taverna; Roberto Turolla; Fabio Muleri
These are the listed authors of the cited contribution sources. Paper authorship does not quantify individual effort. An incomplete list is explicitly marked; same names are not automatically merged. The recorded author list is incomplete.
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English catalogue narrative
Energy-dependent X-ray polarization from magnetar 4U 0142+61
Taverna and colleagues used IXPE to measure phase-averaged X-ray polarization from magnetar 4U 0142+61. They found about 12 ± 1% across 2–8 keV, with different polarization behavior at lower and higher energies and an approximately 90-degree angle change across the intervening band.
Scientific scope
The observed polarization is not an unambiguous direct detection of QED vacuum birefringence: the authors explicitly state that the energy- and phase-integrated polarization is insufficient to establish that effect alone. Their surface, atmosphere and magnetospheric scenarios are model-dependent and not unique; geometric angles are poorly constrained. The 4–5 keV polarization lies below instrumental sensitivity, so the angle there is poorly determined. Alternative processing analyzes the same IXPE observation and is not independent replication. The supplement describes normally distributed Stokes parameters as correlated in one sentence and uncorrelated in another; this literal inconsistency needs source-version and calculation reconciliation rather than silent correction. The individual contributor list shown here is incomplete.
Reading status
This is a source-linked WRS catalogue note. A full explanatory guide and independent scientific reconstruction have not been completed for this entry. Read the identified original work for its complete narrative and arguments.
People and systems
Roberto Taverna; Roberto Turolla; Fabio Muleri
These are the listed authors of the cited contribution sources. Paper authorship does not quantify individual effort. An incomplete list is explicitly marked; same names are not automatically merged.