2016A&A...593A..83D


C.D.S. - SIMBAD4 rel 1.7 - 2021.06.20CEST20:22:43

2016A&A...593A..83D - Astronomy and Astrophysics, volume 593A, 83-83 (2016/9-1)

A model for distortions of polarisation-angle curves in radio pulsars.

DYKS J., SERYLAK M., OSLOWSKI S., SAHA L., GUILLEMOT L., COGNARD I. and RUDAK B.

Abstract (from CDS):

Context. Some radio pulsar profiles (in particular those of millisecond pulsars) contain wide emission structures which cover large intervals of pulse phase. Local distortions of an average curve of polarisation angle (PA) can be identified in such profiles, and they are often found to be associated with absorption features or narrow emission components.
Aims. The features may be interpreted as a convolution of a lateral profile of an emitter with a microscopic radiation pattern of a non-negligible angular extent.
Methods. We study a model which assumes that such an extended microbeam of the X-mode curvature radiation is spreading the radiation polarised at a fixed position angle within an interval of pulse phase.
Results. The model is capable of interpreting the strongly dissimilar polarisation of double notches in PSR B1821-24A (for which we present new polarisation data from the Nancay Radio Telescope) and PSR J0437-4715. It also explains a step-like change in PA observed at the bifurcated trailing component in the profile of J0437-4715. A generic form of the modelled PA distortion is a zigzag-shaped wiggle, which in the presence of the second polarisation mode (O-mode) can be magnified or transformed into a W- or U-shaped deflection of a total net PA.
Conclusions. The model's efficiency in interpreting dissimilar polarisation effects provides further credence to the stream-based (fan-beam) geometry of pulsar emission. It also suggests that the microbeam width may not always be assumed negligible in comparison with the angular scale of emissivity gradients in the emission region.

Abstract Copyright: © ESO, 2016

Journal keyword(s): pulsars: individual: PSR J0437-4715 - radiation mechanisms: non-thermal - pulsars: individual: PSR B1821-24A - pulsars: general

Simbad objects: 8

goto Full paper

goto View the reference in ADS

Number of rows : 8

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2021
#notes
1 3C 48 QSO 01 37 41.2995845985 +33 09 35.079126038   16.62 16.20     ~ 2595 2
2 PSR J0437-47 Psr 04 37 15.99744 -47 15 09.7170           DC 791 0
3 PSR B0950+08 Psr 09 53 09.2970 +07 55 36.400           ~ 704 2
4 PSR J1012+5307 Psr 10 12 33.4341531837 +53 07 02.564526788     19.5     DA 330 1
5 PSR B1237+25 Psr 12 39 40.386 +24 53 49.87           ~ 422 0
6 PSR J1824-2452A Psr 18 24 32.009 -24 52 11.10           ~ 446 2
7 PSR B1919+21 Psr 19 21 44.815 +21 53 02.25           ~ 354 0
8 PSR B1929+10 Psr 19 32 14.0570 +10 59 33.380           ~ 708 0

    Equat.    Gal    SGal    Ecl

To bookmark this query, right click on this link: simbad:objects in 2016A&A...593A..83D and select 'bookmark this link' or equivalent in the popup menu


2021.06.20-20:22:43

© Université de Strasbourg/CNRS

    • Contact