Bistable Profile Illumination in Pulsars B0919+06 & B1859+07

Abstract

A new single pulse behaviour has been identified in two pulsars, B0919+06 and B1859+07. Normally both starts emit bright subpulses in a region near the trailing edge of heir profile. However, occasionally these stars exhibit "events" wherein the emission longitude gradually decreases by about their profile width, remains in this position for typically tens of pulses and then gradually returns over a few pulses to the usual longitude. The effect bears some resemblance to a profile "mode change", but here the effect is gradual and episodic. When the separated profiles of the normal and "event" emission, they reveal a broad and complex profile structure in each pulsar - but one which can probably be understood correctly in terms of a single conical beam. Possibly the effect entails an extreme example of "absorption"-induced profile asymmetry, as suspected in other pulsars. Alternatively, shifting sources of illumination within the pulsar beam may be responsible.

9 pages, 4 figures, submitted to MNRAS

References in corpus (6)

• The subpulse modulation properties of pulsars at 21 cm
• Topology and Polarisation of Subbeams Associated With Pulsar 0943+10's ``Drifting''-Subpulse Emission: I. Analysis of Arecibo 430- and 111-MHz Observations
• Pulsar Magnetospheric Emission Mapping: Images and Implications of Polar-Cap Weather
• Arecibo 430 MHz Pulsar Polarimetry: Faraday Rotation Measures and Morphological Classifications
• Toward An Empirical Theory of Pulsar Emission VIII: Subbeam Circulation and the Polarization-Modal Structure of Conal Beams
• PSR B0809+74: Understanding Its Perplexing Subpulse-separation (P2) Variations

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