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- W2173537011 abstract "We report on observations of the polarization of optical and γ-ray photons from the Crab nebula and pulsar system using the Galway Astronomical Stokes Polarimeter (GASP), the Hubble Space Telescope, Advanced Camera for Surveys and the International Gamma-Ray Astrophysics Laboratory satellite (INTEGRAL). These, when combined with other optical polarization observations, suggest that the polarized optical emission and γ-ray polarization changes in a similar manner. A change in the optical polarization angle has been observed by this work, from 109.5 ± 0| $_{.}^{circ}$|7 in 2005 to 85.3 ± 1| $_{.}^{circ}$|4 in 2012. On the other hand, the γ-ray polarization angle changed from 115 ± 11° in 2003–2007 to 80 ± 12° in 2012–2014. Strong flaring activities have been detected in the Crab nebula over the past few years by the high-energy γ-ray missions Agile and Fermi, and magnetic reconnection processes have been suggested to explain these observations. The change in the polarized optical and γ-ray emission of the Crab nebula/pulsar as observed, for the first time, by GASP and INTEGRAL may indicate that reconnection is possibly at work in the Crab nebula. We also report, for the first time, a non-zero measure of the optical circular polarization from the Crab pulsar+knot system." @default.
- W2173537011 created "2016-06-24" @default.
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- W2173537011 date "2015-12-31" @default.
- W2173537011 modified "2023-10-18" @default.
- W2173537011 title "A recent change in the optical and γ-ray polarization of the Crab nebula and pulsar" @default.
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- W2173537011 doi "https://doi.org/10.1093/mnras/stv2780" @default.
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