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Title: Inter-relationship between the two emission cones of B1237+25

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 and 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 thismore » 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.« less

Authors:
 [1]
  1. Joint Astronomy Programme (JAP), Indian Institute of Science, Bangalore 560012, India. (India)
Publication Date:
OSTI Identifier:
22365091
Resource Type:
Journal Article
Journal Name:
Astrophysical Journal
Additional Journal Information:
Journal Volume: 792; Journal Issue: 2; Other Information: Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 0004-637X
Country of Publication:
United States
Language:
English
Subject:
79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; BEAMS; CORRELATIONS; EMISSION; FLUCTUATIONS; MAGNETIC FIELDS; MODULATION; PULSARS; PULSES; STARS

Citation Formats

Maan, Yogesh, and Deshpande, Avinash A., E-mail: yogesh@rri.res.in, E-mail: desh@rri.res.in. Inter-relationship between the two emission cones of B1237+25. United States: N. p., 2014. Web. doi:10.1088/0004-637X/792/2/130.
Maan, Yogesh, & Deshpande, Avinash A., E-mail: yogesh@rri.res.in, E-mail: desh@rri.res.in. Inter-relationship between the two emission cones of B1237+25. United States. https://doi.org/10.1088/0004-637X/792/2/130
Maan, Yogesh, and Deshpande, Avinash A., E-mail: yogesh@rri.res.in, E-mail: desh@rri.res.in. 2014. "Inter-relationship between the two emission cones of B1237+25". United States. https://doi.org/10.1088/0004-637X/792/2/130.
@article{osti_22365091,
title = {Inter-relationship between the two emission cones of B1237+25},
author = {Maan, Yogesh and Deshpande, Avinash A., E-mail: yogesh@rri.res.in, E-mail: desh@rri.res.in},
abstractNote = {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 and 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.},
doi = {10.1088/0004-637X/792/2/130},
url = {https://www.osti.gov/biblio/22365091}, journal = {Astrophysical Journal},
issn = {0004-637X},
number = 2,
volume = 792,
place = {United States},
year = {Wed Sep 10 00:00:00 EDT 2014},
month = {Wed Sep 10 00:00:00 EDT 2014}
}