Differential frequency-dependent delay from the pulsar magnetosphere
T. E. Hassall
(1)
,
B. W. Stappers
(2)
,
P. Weltevrede
(2)
,
J. W. T. Hessels
(3)
,
A. Alexov
(4)
,
T. Coenen
(4)
,
A. Karastergiou
(5)
,
M. Kramer
(2)
,
E. F. Keane
(6)
,
V. I. Kondratiev
(4)
,
J. van Leeuwen
(3)
,
A. Noutsos
(6)
,
M. Pilia
(4)
,
M. Serylak
(7, 8)
,
C. Sobey
(6)
,
K. Zagkouris
(5)
,
R. Fender
(1)
,
M. E. Bell
(1)
,
J. Broderick
(1)
,
J. Eislöffel
(9)
,
H. Falcke
(4, 6, 10)
,
Jean-Mathias Griessmeier
(7, 8)
,
M. Kuniyoshi
(6)
,
J. C. A. Miller-Jones
(11)
,
M. W. Wise
(11, 4)
,
O. Wucknitz
(12)
,
P. Zarka
(13)
,
A. Asgekar
(4)
,
F. Batejat
(14)
,
M. J. Bentum
(4)
,
G. Bernardi
(15)
,
P. Best
(16)
,
A. Bonafede
(17)
,
F. Breitling
(18)
,
M. Brüggen
(19)
,
H. R. Butcher
(4)
,
B. Ciardi
(20)
,
F. de Gasperin
(21)
,
J.-P. de Reijer
(4)
,
S. Duscha
(4)
,
R. A. Fallows
(4)
,
C. Ferrari
(22)
,
W. Frieswijk
(4)
,
M. A. Garrett
(4, 23)
,
A. W. Gunst
(4)
,
G. Heald
(4)
,
M. Hoeft
(9)
,
E. Juette
(24)
,
P. Maat
(4)
,
J. P. Mckean
(4)
,
M. J. Norden
(4)
,
M. Pandey-Pommier
(25)
,
R. Pizzo
(4)
,
A. G. Polatidis
(4)
,
W. Reich
(6)
,
H. Röttgering
(23)
,
J. Sluman
(4)
,
Y. Tang
(4)
,
C. Tasse
(13)
,
R. Vermeulen
(4)
,
R. J. van Weeren
(4)
,
S. J. Wijnholds
(4)
,
S. Yatawatta
(21)
1
University of Southampton
2 Jodrell Bank Centre for Astrophysics
3 UvA - University of Amsterdam [Amsterdam] = Universiteit van Amsterdam
4 ASTRON - Netherlands Institute for Radio Astronomy
5 Oxford Astrophysics
6 MPIFR - Max-Planck-Institut für Radioastronomie
7 USN - Unité Scientifique de la Station de Nançay
8 LPC2E - Laboratoire de Physique et Chimie de l'Environnement et de l'Espace
9 TLS - Thüringer Landessternwarte Tautenburg
10 Radboud University [Nijmegen]
11 AI PANNEKOEK - Astronomical Institute Anton Pannekoek
12 AlfA - Argelander-Institut für Astronomie
13 LESIA - Laboratoire d'études spatiales et d'instrumentation en astrophysique
14 OSO - Onsala Space Observatory
15 LPNHE - Laboratoire de Physique Nucléaire et de Hautes Énergies
16 Edin. - University of Edinburgh
17 Jacobs University = Constructor University [Bremen]
18 AIP - Leibniz-Institut für Astrophysik Potsdam
19 UHH - Universität Hamburg
20 Max Planck Institute for Astrophysics
21 Kapteyn Astronomical Institute [Groningen]
22 LAGRANGE - Joseph Louis LAGRANGE
23 Leiden Observatory [Leiden]
24 RUB - Ruhr University Bochum = Ruhr-Universität Bochum
25 CRAL - Centre de Recherche Astrophysique de Lyon
2 Jodrell Bank Centre for Astrophysics
3 UvA - University of Amsterdam [Amsterdam] = Universiteit van Amsterdam
4 ASTRON - Netherlands Institute for Radio Astronomy
5 Oxford Astrophysics
6 MPIFR - Max-Planck-Institut für Radioastronomie
7 USN - Unité Scientifique de la Station de Nançay
8 LPC2E - Laboratoire de Physique et Chimie de l'Environnement et de l'Espace
9 TLS - Thüringer Landessternwarte Tautenburg
10 Radboud University [Nijmegen]
11 AI PANNEKOEK - Astronomical Institute Anton Pannekoek
12 AlfA - Argelander-Institut für Astronomie
13 LESIA - Laboratoire d'études spatiales et d'instrumentation en astrophysique
14 OSO - Onsala Space Observatory
15 LPNHE - Laboratoire de Physique Nucléaire et de Hautes Énergies
16 Edin. - University of Edinburgh
17 Jacobs University = Constructor University [Bremen]
18 AIP - Leibniz-Institut für Astrophysik Potsdam
19 UHH - Universität Hamburg
20 Max Planck Institute for Astrophysics
21 Kapteyn Astronomical Institute [Groningen]
22 LAGRANGE - Joseph Louis LAGRANGE
23 Leiden Observatory [Leiden]
24 RUB - Ruhr University Bochum = Ruhr-Universität Bochum
25 CRAL - Centre de Recherche Astrophysique de Lyon
J. Eislöffel
- Fonction : Auteur
- PersonId : 761407
- ORCID : 0000-0001-6496-0252
Jean-Mathias Griessmeier
- Fonction : Auteur
- PersonId : 737206
- IdHAL : jean-mathias-griessmeier
- ORCID : 0000-0003-3362-7996
- IdRef : 235780871
P. Zarka
- Fonction : Auteur
- PersonId : 755767
- ORCID : 0000-0003-1672-9878
- IdRef : 034944648
A. Bonafede
- Fonction : Auteur
- PersonId : 766668
- ORCID : 0000-0002-5068-4581
F. de Gasperin
- Fonction : Auteur
- PersonId : 766669
- ORCID : 0000-0003-4439-2627
C. Ferrari
- Fonction : Auteur
- PersonId : 743106
- IdHAL : chiara-ferrari
- ORCID : 0000-0002-2917-9759
R. Pizzo
- Fonction : Auteur
- PersonId : 766670
- ORCID : 0000-0003-2816-9492
H. Röttgering
- Fonction : Auteur
- PersonId : 766671
- ORCID : 0000-0001-8887-2257
- IdRef : 223410934
Résumé
Some radio pulsars show clear 'drifting subpulses', in which subpulses are seen to drift in pulse longitude in a systematic pattern. Here we examine how the drifting subpulses of PSR B0809+74 evolve with time and observing frequency. We show that the subpulse period (P3) is constant on timescales of days, months and years, and between 14-5100 MHz. Despite this, the shapes of the dn´ftbands change radically with frequency. Previous studies have concluded that, while the subpulses appear to move through the pulse window approximately linearly at low frequencies (<500 MHz), a discrete step of ~180° in subpulse phase is observed at higher frequencies (>820 MHz) near to the peak of the average pulse profile. We use LOFAR, GMRT, GBT, WSRT and Effelsberg 100-m data to explore the frequency-dependence of this phase step. We show that the size of the subpulse phase step increases gradually, and is observable even at low frequencies. We attribute the subpulse phase step to the presence of two separate driftbands, whose relative arrival times vary with frequency - one driftband arriving 30 pulses earlier at 20 MHz than it does at 1380 MHz, whilst the other arrives simultaneously at all frequencies. The drifting pattern which is observed here cannot be explained by either the rotating carousel model or the surface oscillation model, and could provide new insight into the physical processes happening within the pulsar magnetosphere.
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