Please use this identifier to cite or link to this item: http://hdl.handle.net/2289/5991
Title: Inter-relationship between the two emission cones of B1237+25
Authors: Maan, Yogesh
Deshpande, A.A.
Keywords: Pulsars General
Pulsars Individual
24months
Issue Date: 10-Sep-2014
Publisher: IOP Sciences for The American Astronomical Society
Citation: Astrophysical Journal, 2014, Vol.792, p 130
Abstract: The origin of two distinct pairs of conal emission components in pulsars, associated with the "outer" and the "inner" emission cones, as well as the marked difference in their observed spectral properties, is poorly understood. The sub-pulse modulation in the corresponding conal components, if mapped back to the underlying system of sub-beams rotating around the magnetic axis in the polar cap, as envisioned by Ruderman & Sutherland, provides a potential way to investigate the emission morphologies in the two conal regions, and more importantly, any inter-relationship between them. The bright pulsar B1237+25 with its special viewing geometry where the sightline traverses almost through the magnetic axis, along with a rich variety in pulse-to-pulse fluctuations, provides an excellent but challenging opportunity to map the underlying emission patterns across the full transverse slice of its polar emission region. We present here our analysis on a number of pulse sequences from this star to map and study any relationship between the underlying patterns responsible for emission in the two pairs of presumed conal components and a core component of this pulsar. The results from our correlation analysis of the two conal emission patterns strongly support the view that the two cones of this pulsar (the outer and the inner cone) originate from a common system of sub-beams. We also see evidence for a twist in the emission columns, most likely associated with a corresponding twist in the magnetic field structure. We discuss these results, and their implications, including a possibility that the core component of this pulsar shares its origin partly with the conal counterparts.
Description: Restricted Access. An open-access version is available at arXiv.org (one of the alternative locations)
URI: http://hdl.handle.net/2289/5991
ISSN: 0004-637X
1538-4357-(Online)
Alternative Location: http://adsabs.harvard.edu/abs/2014ApJ...792..130M
http://arxiv.org/abs/1407.6368
http://dx.doi.org/10.1088/0004-637X/792/2/130
Copyright: 2014 American Astronomical Society, This article may be downloaded for personal use only. Any other use requires prior permission of the author and The American Astronomical Society
Appears in Collections:Research Papers (A&A)

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