Differential frequency-dependent delay from the pulsar magnetosphere

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 tim...

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Main Authors:	Hassall, T., Stappers, B., Weltevrede, P., Hessels, J., Alexov, A., Coenen, T., Karastergiou, A., Kramer, M., Keane, E., Kondratiev, V., van Leeuwen, J., Noutsos, A., Pilia, M., Serylak, M., Sobey, C., Zagkouris, K., Fender, R., Bell, M., Broderick, J., Eisloeffel, J., Falcke, H., Griessmeier, J., Kuniyoshi, M., Miller-Jones, James, Wise, M., Wucknitz, O., Zarka, P., Asgekar, A., Batejat, F., Bentum, M., BERNARDI, G., Best, P., Bonafede, A., Breitling, F., Brueggen, M., Butcher, H., Ciardi, B., de Gasperin, F., de Reijer, J., Duscha, S., Fallows, R., Ferrari, C., Frieswijk, W., Garrett, M., Gunst, A., Heald, G., Hoeft, M., Juette, E., Maat, P., McKean, J., Norden, M., Pandey-Pommier, M., Pizzo, R., Polatidis, A., Reich, W., Roettgering, H., Sluman, J., Tang, Y., Tasse, C., Vermeulen, R., van Weeren, R., Wijnholds, S., Yatawatta, S.
Format:	Journal Article
Published:	EDP Sciences 2013
Subjects:	pulsars: general telescopes pulsars: individual: PSR B0809+74
Online Access:	http://www.aanda.org/index.php?option=com_article&access=doi&doi=10.1051/0004-6361/201220764 http://hdl.handle.net/20.500.11937/23008

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author	Hassall, T. Stappers, B. Weltevrede, P. Hessels, J. Alexov, A. Coenen, T. Karastergiou, A. Kramer, M. Keane, E. Kondratiev, V. van Leeuwen, J. Noutsos, A. Pilia, M. Serylak, M. Sobey, C. Zagkouris, K. Fender, R. Bell, M. Broderick, J. Eisloeffel, J. Falcke, H. Griessmeier, J. Kuniyoshi, M. Miller-Jones, James Wise, M. Wucknitz, O. Zarka, P. Asgekar, A. Batejat, F. Bentum, M. BERNARDI, G. Best, P. Bonafede, A. Breitling, F. Brueggen, M. Butcher, H. Ciardi, B. de Gasperin, F. de Reijer, J. Duscha, S. Fallows, R. Ferrari, C. Frieswijk, W. Garrett, M. Gunst, A. Heald, G. Hoeft, M. Juette, E. Maat, P. McKean, J. Norden, M. Pandey-Pommier, M. Pizzo, R. Polatidis, A. Reich, W. Roettgering, H. Sluman, J. Tang, Y. Tasse, C. Vermeulen, R. van Weeren, R. Wijnholds, S. Yatawatta, S.
author_facet	Hassall, T. Stappers, B. Weltevrede, P. Hessels, J. Alexov, A. Coenen, T. Karastergiou, A. Kramer, M. Keane, E. Kondratiev, V. van Leeuwen, J. Noutsos, A. Pilia, M. Serylak, M. Sobey, C. Zagkouris, K. Fender, R. Bell, M. Broderick, J. Eisloeffel, J. Falcke, H. Griessmeier, J. Kuniyoshi, M. Miller-Jones, James Wise, M. Wucknitz, O. Zarka, P. Asgekar, A. Batejat, F. Bentum, M. BERNARDI, G. Best, P. Bonafede, A. Breitling, F. Brueggen, M. Butcher, H. Ciardi, B. de Gasperin, F. de Reijer, J. Duscha, S. Fallows, R. Ferrari, C. Frieswijk, W. Garrett, M. Gunst, A. Heald, G. Hoeft, M. Juette, E. Maat, P. McKean, J. Norden, M. Pandey-Pommier, M. Pizzo, R. Polatidis, A. Reich, W. Roettgering, H. Sluman, J. Tang, Y. Tasse, C. Vermeulen, R. van Weeren, R. Wijnholds, S. Yatawatta, S.
author_sort	Hassall, T.
building	Curtin Institutional Repository
collection	Online Access
description	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 driftbands 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.
first_indexed	2025-11-14T07:46:16Z
format	Journal Article
id	curtin-20.500.11937-23008
institution	Curtin University Malaysia
institution_category	Local University
last_indexed	2025-11-14T07:46:16Z
publishDate	2013
publisher	EDP Sciences
recordtype	eprints
repository_type	Digital Repository
spelling	curtin-20.500.11937-230082019-02-19T05:35:00Z Differential frequency-dependent delay from the pulsar magnetosphere Hassall, T. Stappers, B. Weltevrede, P. Hessels, J. Alexov, A. Coenen, T. Karastergiou, A. Kramer, M. Keane, E. Kondratiev, V. van Leeuwen, J. Noutsos, A. Pilia, M. Serylak, M. Sobey, C. Zagkouris, K. Fender, R. Bell, M. Broderick, J. Eisloeffel, J. Falcke, H. Griessmeier, J. Kuniyoshi, M. Miller-Jones, James Wise, M. Wucknitz, O. Zarka, P. Asgekar, A. Batejat, F. Bentum, M. BERNARDI, G. Best, P. Bonafede, A. Breitling, F. Brueggen, M. Butcher, H. Ciardi, B. de Gasperin, F. de Reijer, J. Duscha, S. Fallows, R. Ferrari, C. Frieswijk, W. Garrett, M. Gunst, A. Heald, G. Hoeft, M. Juette, E. Maat, P. McKean, J. Norden, M. Pandey-Pommier, M. Pizzo, R. Polatidis, A. Reich, W. Roettgering, H. Sluman, J. Tang, Y. Tasse, C. Vermeulen, R. van Weeren, R. Wijnholds, S. Yatawatta, S. pulsars: general telescopes pulsars: individual: PSR B0809+74 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 driftbands 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. 2013 Journal Article http://hdl.handle.net/20.500.11937/23008 http://www.aanda.org/index.php?option=com_article&access=doi&doi=10.1051/0004-6361/201220764 EDP Sciences restricted
spellingShingle	pulsars: general telescopes pulsars: individual: PSR B0809+74 Hassall, T. Stappers, B. Weltevrede, P. Hessels, J. Alexov, A. Coenen, T. Karastergiou, A. Kramer, M. Keane, E. Kondratiev, V. van Leeuwen, J. Noutsos, A. Pilia, M. Serylak, M. Sobey, C. Zagkouris, K. Fender, R. Bell, M. Broderick, J. Eisloeffel, J. Falcke, H. Griessmeier, J. Kuniyoshi, M. Miller-Jones, James Wise, M. Wucknitz, O. Zarka, P. Asgekar, A. Batejat, F. Bentum, M. BERNARDI, G. Best, P. Bonafede, A. Breitling, F. Brueggen, M. Butcher, H. Ciardi, B. de Gasperin, F. de Reijer, J. Duscha, S. Fallows, R. Ferrari, C. Frieswijk, W. Garrett, M. Gunst, A. Heald, G. Hoeft, M. Juette, E. Maat, P. McKean, J. Norden, M. Pandey-Pommier, M. Pizzo, R. Polatidis, A. Reich, W. Roettgering, H. Sluman, J. Tang, Y. Tasse, C. Vermeulen, R. van Weeren, R. Wijnholds, S. Yatawatta, S. Differential frequency-dependent delay from the pulsar magnetosphere
title	Differential frequency-dependent delay from the pulsar magnetosphere
title_full	Differential frequency-dependent delay from the pulsar magnetosphere
title_fullStr	Differential frequency-dependent delay from the pulsar magnetosphere
title_full_unstemmed	Differential frequency-dependent delay from the pulsar magnetosphere
title_short	Differential frequency-dependent delay from the pulsar magnetosphere
title_sort	differential frequency-dependent delay from the pulsar magnetosphere
topic	pulsars: general telescopes pulsars: individual: PSR B0809+74
url	http://www.aanda.org/index.php?option=com_article&access=doi&doi=10.1051/0004-6361/201220764 http://hdl.handle.net/20.500.11937/23008

Differential frequency-dependent delay from the pulsar magnetosphere

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