Astronomy and Astrophysics – Astronomy
Scientific paper
Apr 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008mnras.385..606m&link_type=abstract
Monthly Notices of the Royal Astronomical Society, Volume 385, Issue 2, pp. 606-613.
Astronomy and Astrophysics
Astronomy
4
Mhd, Plasmas, Polarization, Radiation Mechanisms: Non-Thermal, Methods: Data Analysis, Pulsars: Individual: B1857-26
Scientific paper
New Giant Metre-Wave Radio Telescope (GMRT) observations of the five-component pulsar B1857-26 provide detailed insight into its pulse-sequence modulation phenomena for the first time. The outer conal components exhibit a 7.4-rotation period, longitude-stationary modulation. Several lines of evidence indicate a carousel circulation time of about 147 stellar rotations, characteristic of a pattern with 20 beamlets. The pulsar nulls some 20 per cent of the time, usually for only a single pulse, and these nulls show no discernible order or periodicity. Finally, the pulsar's polarization-angle traverse raises interesting issues: if most of its emission comprises a single polarization mode, the full traverse exceeds 180° or if both polarization modes are present, then the leading and the trailing halves of the profiles exhibit two different modes. In either case, the rotating-vector model fails to fit the polarization-angle traverse of the core component.
Mitra Dipanjan
Rankin Joanna M.
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