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Walsh, Amy L.

doi:10.1093/combul/41.3.26

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“…077 (the errors denote the rms of the astrometric fit). For each set of observations, the images taken in the different polarisers were analysed using the IMPOL 2 software (Walsh 1999), which produces polarisation maps (see Fig. 1).…”

Section: Observations and Data Reductionmentioning

confidence: 99%

HST optical polarimetry of the Vela pulsar and nebula

Moran¹,

Mignani²,

Shearer³

2014

Monthly Notices of the Royal Astronomical Society

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Polarisation measurements of pulsars offer an unique insight into the geometry of the emission regions in the neutron star magnetosphere. Therefore, they provide observational constraints on the different models proposed for the pulsar emission mechanisms. Optical polarisation data of the Vela pulsar was obtained from the Hubble Space Telescope (HST) archive. The data, obtained in two filters (F606W; central wavelength = 590.70 nm, and F550M; central wavelength = 558.15 nm), consists of a series of observations of the pulsar taken with the HST/Advanced Camera for Surveys (ACS) and covers a time span of 5 days. This data have been used to carry out the first high-spatial resolution and multi-epoch study of the polarisation of the pulsar. We produced polarisation vector maps of the region surrounding the pulsar and measured the degree of linear polarisation (P.D.) and the position angle (P.A.) of the pulsar's integrated pulse beam. We obtained P.D. = 8.1% ± 0.7% and P.A. = 146.3 • ± 2.4 • , averaged over the time span covered by these observations. These results not only confirm those originally obtained by Wagner & Seifert and Mignani et al., both using the Very Large Telescope (VLT), but are of greater precision. Furthermore, we confirm that the P.A. of the pulsar polarisation vector is aligned with the direction of the pulsar proper-motion. The pulsar wind nebula (PWN) is undetected in polarised light as is the case in unpolarised light, down to a flux limit of 26.8 magnitudes arcsec −2 .

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Section: Observations and Data Reductionmentioning

confidence: 99%