Pulsar Emission Beam Geometry of Radio Broadband Arecibo Sources

Abstract

We present radio pulsar emission beam analyses and models with the primary intent of examining pulsar beam geometry and physics over the broadest band of radio frequencies reasonably obtainable. We consider a set of well-studied pulsars that lie within the Arecibo sky. These pulsars stand out for the broad frequency range over which emission is detectable, and have been extensively observed at frequencies up to 4.5 GHz and down to below 100 MHz. We utilize published profiles to quantify a more complete picture of the frequency evolution of these pulsars using the core/double-cone emission beam model as our classification framework. For the low-frequency observations, we take into account measured scattering time-scales to infer intrinsic vs scatter broadening of the pulse profile. Lastly, we discuss the populational trends of the core/conal class profiles with respect to intrinsic parameters. We demonstrate that for this sub-population of pulsars, core and conal dominated profiles cluster together into two roughly segregated $P$-$\dot{P}$ populations, lending credence to the proposal that an evolution in the pair-formation geometries is responsible for core/conal emission and other emission effects such as nulling and mode-changing.

22 pages, 24 figures; MNRAS, in press

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Cited by in corpus (5)

• Polarization Measurements of Arecibo-Sky Pulsars: Faraday Rotations and Emission-Beam Analyses
• Radio Pulsar Emission-Beam Geometry at Low Frequency: LOFAR High Band Survey Sources Studied using Arecibo at 1.4 GHz and 327 MHz
• Arecibo Pulsar Beam Geometry at Lower Frequencies Radio Pulsar Beam Geometry Down to the 100-MHz Band: 76 Additional Sources Within the Arecibo Sky
• Topology of Pulsar Profiles (ToPP). I. Graph theory method and classification of the EPN
• Improving pulsar-timing solutions through dynamic pulse fitting