AWhat changed
The OSO-8 team reported X-ray polarization of the Crab in two bands from 1976 quick-look satellite data. A later phase-selected analysis by a partly different author team combined 1976 and 1977 observations and measured approximately 19% polarization at 2.6 and 5.2 keV, supporting a synchrotron interpretation.
Scientific scope
The OSO-8 team reported X-ray polarization of the Crab in two bands from 1976 quick-look satellite data. A later phase-selected analysis by a partly different author team combined 1976 and 1977 observations and measured approximately 19% polarization at 2.6 and 5.2 keV, supporting a synchrotron interpretation. The 1976 quick-look result includes the nebula and pulsar, whereas the 1978 selection attributes an off-pulse interval to the nebula based on an earlier occultation limit; this is not an unconditional proof of zero pulsar contamination. The 1978 analysis reuses 1976 observations and is not an independent replication. Results depend on modulation calibration and background subtraction, with substantial relative background at 5.2 keV; the early paper notes a systematic difference between its two detectors below two standard deviations. An earlier 1972 rocket detection predates the OSO-8 reports and is a separate contribution.
Evidence
The linked original works support the scoped statement and contribution attribution. WRS has not independently replayed experiments or reconstructed a full mathematical proof. The 1976 quick-look result includes the nebula and pulsar, whereas the 1978 selection attributes an off-pulse interval to the nebula based on an earlier occultation limit; this is not an unconditional proof of zero pulsar contamination. The 1978 analysis reuses 1976 observations and is not an independent replication. Results depend on modulation calibration and background subtraction, with substantial relative background at 5.2 keV; the early paper notes a systematic difference between its two detectors below two standard deviations. An earlier 1972 rocket detection predates the OSO-8 reports and is a separate contribution.
Contributors
- The named authors in the research record · SCIENCE: 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.
- A precision measurement of the X-ray polarization of the Crab Nebula without pulsar contamination
- Measurement of the X-ray polarization of the Crab Nebula
Provisional WRS assessment, edition 2026-10-28.1. Independent expert calibration is pending. This grade does not certify correctness or assign ownership.
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