Using the Intensity Modulation Index to Test Pulsar Radio Emission Models

Abstract

This letter explores the possibility of testing pulsar radio emission models by observing pulse-to-pulse intensity modulation. It is shown that a relationship between a pulsar's period, period derivative, and intensity modulation is a natural consequence of at least one theoretical model of radio pulsar emission. It is proposed that other models may also predict a similar correlation. The exact form of the relationship will depend on the model in question. Hence, observations of intensity modulation should be able to determine the validity of the various emission models. In an attempt to search for the predicted dependencies, the modulation properties of a set of 12 pulsars are studied. These data are suggestive, but they are unable to differentiate between three possibilities for the emission process. Future observations will be able to confirm these results and determine whether or not specific emission models are viable.

Accepted by ApJ Letters for the October 20th issue

References in corpus (9)

• The Velocity Distribution of Isolated Radio Pulsars
• Pair-production multiplicities in rotation-powered pulsars
• High-resolution single-pulse studies of the Vela Pulsar
• Probing drifting and nulling mechanisms through their interaction in PSR B0809+74
• Pulse-to-pulse intensity modulation and drifting subpulses in recycled pulsars
• Toward An Empirical Theory of Pulsar Emission VIII: Subbeam Circulation and the Polarization-Modal Structure of Conal Beams
• Topology and Polarisation of Subbeams Associated With Pulsar B0943+10's `Drifting'-Subpulse Emission: II. Analysis of Gauribidanur 35-MHz Observations
• Unusual Subpulse Modulation in PSR B0320+39
• MHD tidal waves on a spinning magnetic compact star

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• The subpulse modulation properties of pulsars at 21 cm
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• The High Time Resolution Universe Survey - V: Single-pulse energetics and modulation properties of 315 pulsars
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• The Thousand-Pulsar-Array programme on MeerKAT III: Giant pulse characteristics of PSR J0540$-$6919
• The Thousand-Pulsar-Array programme on MeerKAT -- VIII. The subpulse modulation of 1198 pulsars
• CHILES VERDES: Radio variability at an unprecedented depth and cadence in the COSMOS field
• A Gaussian Mixture Model for Nulling Pulsars
• Variability of the Pulsed Radio Emission from the Large Magellanic Cloud Pulsar PSR J0529-6652
• The Statistics of Radio Astronomical Polarimetry: Disjoint, Superposed, and Composite Samples
• The intrinsic intensity modulation of PSR B1937+21 at 1410 MHz
• Pulse to pulse flux density modulation from pulsars at 8.35 GHz
• The LOFAR Transients Pipeline