Wide-band simultaneous observations of pulsars: disentangling dispersion measure and profile variations

Dispersion in the interstellar medium is a well known phenomenon that follows a simple relationship, which has been used to predict the time delay of dispersed radio pulses since the late 1960s. We performed wide-band simultaneous observations of four pulsars with LOFAR (at 40-190 MHz), the 76-m Lov...

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Main Authors:	Hassall, T., Stappers, B., Hessels, J., Kramer, M., Alexov, A., Anderson, K., Coenen, T., Karastergiou, A., Keane, E., Kondratiev, V., Lazaridis, K., van Leeuwen, J., Noutsos, A., Serylak, M., Sobey, C., Verbiest, J., Weltevrede, P., Zagkouris, K., Fender, R., Wijers, R., Baehren, L., Bell, M., Broderick, J., Corbel, S., Daw, E., Dhillon, V., Eisloeffel, J., Falcke, H., Griessmeier, J., Jonker, P., Law, C., Markoff, S., Miller-Jones, James, Osten, R., Rol, E., Scaife, A., Scheers, B., Schellart, P., Spreeuw, H., Swinbank, J., ter Veen, S., Wise, M., Wijnands, R., Wucknitz, O., Zarka, P., Asgekar, A., Bentum, M., BERNARDI, G., Best, P., Bonafede, A., Boonstra, A., Brentjens, M., Brouw, W., Brueggen, M., Butcher, H., Ciardi, B., Garrett, M., Gerbers, M., Gunst, A., van Haarlem, M., Heald, G., Hoeft, M., Holties, H., de Jong, A., Koopmans, L., Kuniyoshi, M., Kuper, G., Loose, G., Maat, P., Masters, J., McKean, J., Meulman, H., Mevius, M., Munk, H., Noordam, J., Orru, E., Paas, H., Pandey-Pommier, M., Pandey, V., Pizzo, R., Polatidis, A., Reich, W., Rottgering, H., Sluman, J., Steinmetz, M., Sterks, C., Tagger, M., Yang, T., Tasse, C., Vermeulen, R., van Weeren, R., Wijnholds, S., Yatawatta, S.
Format:	Journal Article
Published:	EDP Sciences 2012
Subjects:	ISM: general pulsars: general magnetic fields telescopes
Online Access:	http://hdl.handle.net/20.500.11937/7327

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author	Hassall, T. Stappers, B. Hessels, J. Kramer, M. Alexov, A. Anderson, K. Coenen, T. Karastergiou, A. Keane, E. Kondratiev, V. Lazaridis, K. van Leeuwen, J. Noutsos, A. Serylak, M. Sobey, C. Verbiest, J. Weltevrede, P. Zagkouris, K. Fender, R. Wijers, R. Baehren, L. Bell, M. Broderick, J. Corbel, S. Daw, E. Dhillon, V. Eisloeffel, J. Falcke, H. Griessmeier, J. Jonker, P. Law, C. Markoff, S. Miller-Jones, James Osten, R. Rol, E. Scaife, A. Scheers, B. Schellart, P. Spreeuw, H. Swinbank, J. ter Veen, S. Wise, M. Wijnands, R. Wucknitz, O. Zarka, P. Asgekar, A. Bell, M. Bentum, M. BERNARDI, G. Best, P. Bonafede, A. Boonstra, A. Brentjens, M. Brouw, W. Brueggen, M. Butcher, H. Ciardi, B. Garrett, M. Gerbers, M. Gunst, A. van Haarlem, M. Heald, G. Hoeft, M. Holties, H. de Jong, A. Koopmans, L. Kuniyoshi, M. Kuper, G. Loose, G. Maat, P. Masters, J. McKean, J. Meulman, H. Mevius, M. Munk, H. Noordam, J. Orru, E. Paas, H. Pandey-Pommier, M. Pandey, V. Pizzo, R. Polatidis, A. Reich, W. Rottgering, H. Sluman, J. Steinmetz, M. Sterks, C. Tagger, M. Yang, T. Tasse, C. Vermeulen, R. van Weeren, R. Wijnholds, S. Yatawatta, S.
author_facet	Hassall, T. Stappers, B. Hessels, J. Kramer, M. Alexov, A. Anderson, K. Coenen, T. Karastergiou, A. Keane, E. Kondratiev, V. Lazaridis, K. van Leeuwen, J. Noutsos, A. Serylak, M. Sobey, C. Verbiest, J. Weltevrede, P. Zagkouris, K. Fender, R. Wijers, R. Baehren, L. Bell, M. Broderick, J. Corbel, S. Daw, E. Dhillon, V. Eisloeffel, J. Falcke, H. Griessmeier, J. Jonker, P. Law, C. Markoff, S. Miller-Jones, James Osten, R. Rol, E. Scaife, A. Scheers, B. Schellart, P. Spreeuw, H. Swinbank, J. ter Veen, S. Wise, M. Wijnands, R. Wucknitz, O. Zarka, P. Asgekar, A. Bell, M. Bentum, M. BERNARDI, G. Best, P. Bonafede, A. Boonstra, A. Brentjens, M. Brouw, W. Brueggen, M. Butcher, H. Ciardi, B. Garrett, M. Gerbers, M. Gunst, A. van Haarlem, M. Heald, G. Hoeft, M. Holties, H. de Jong, A. Koopmans, L. Kuniyoshi, M. Kuper, G. Loose, G. Maat, P. Masters, J. McKean, J. Meulman, H. Mevius, M. Munk, H. Noordam, J. Orru, E. Paas, H. Pandey-Pommier, M. Pandey, V. Pizzo, R. Polatidis, A. Reich, W. Rottgering, H. Sluman, J. Steinmetz, M. Sterks, C. Tagger, M. Yang, T. Tasse, C. Vermeulen, R. van Weeren, R. Wijnholds, S. Yatawatta, S.
author_sort	Hassall, T.
building	Curtin Institutional Repository
collection	Online Access
description	Dispersion in the interstellar medium is a well known phenomenon that follows a simple relationship, which has been used to predict the time delay of dispersed radio pulses since the late 1960s. We performed wide-band simultaneous observations of four pulsars with LOFAR (at 40-190 MHz), the 76-m Lovell Telescope (at 1400 MHz) and the Effelsberg 100-m Telescope (at 8000 MHz) to test the accuracy of the dispersion law over a broad frequency range. In this paper we present the results of these observations which show that the dispersion law is accurate to better than 1 part in 10^5 across our observing band. We use this fact to constrain some of the properties of the interstellar medium along the line-of-sight and use the lack of any aberration or retardation effects to determine upper limits on emission heights in the pulsar magnetosphere. We also discuss the effect of pulse profile evolution on our observations, and the implications that it could have for precision pulsar timing projects such as the detection of gravitational waves with pulsar timing arrays.
first_indexed	2025-11-14T06:15:45Z
format	Journal Article
id	curtin-20.500.11937-7327
institution	Curtin University Malaysia
institution_category	Local University
last_indexed	2025-11-14T06:15:45Z
publishDate	2012
publisher	EDP Sciences
recordtype	eprints
repository_type	Digital Repository
spelling	curtin-20.500.11937-73272017-09-13T14:36:24Z Wide-band simultaneous observations of pulsars: disentangling dispersion measure and profile variations Hassall, T. Stappers, B. Hessels, J. Kramer, M. Alexov, A. Anderson, K. Coenen, T. Karastergiou, A. Keane, E. Kondratiev, V. Lazaridis, K. van Leeuwen, J. Noutsos, A. Serylak, M. Sobey, C. Verbiest, J. Weltevrede, P. Zagkouris, K. Fender, R. Wijers, R. Baehren, L. Bell, M. Broderick, J. Corbel, S. Daw, E. Dhillon, V. Eisloeffel, J. Falcke, H. Griessmeier, J. Jonker, P. Law, C. Markoff, S. Miller-Jones, James Osten, R. Rol, E. Scaife, A. Scheers, B. Schellart, P. Spreeuw, H. Swinbank, J. ter Veen, S. Wise, M. Wijnands, R. Wucknitz, O. Zarka, P. Asgekar, A. Bell, M. Bentum, M. BERNARDI, G. Best, P. Bonafede, A. Boonstra, A. Brentjens, M. Brouw, W. Brueggen, M. Butcher, H. Ciardi, B. Garrett, M. Gerbers, M. Gunst, A. van Haarlem, M. Heald, G. Hoeft, M. Holties, H. de Jong, A. Koopmans, L. Kuniyoshi, M. Kuper, G. Loose, G. Maat, P. Masters, J. McKean, J. Meulman, H. Mevius, M. Munk, H. Noordam, J. Orru, E. Paas, H. Pandey-Pommier, M. Pandey, V. Pizzo, R. Polatidis, A. Reich, W. Rottgering, H. Sluman, J. Steinmetz, M. Sterks, C. Tagger, M. Yang, T. Tasse, C. Vermeulen, R. van Weeren, R. Wijnholds, S. Yatawatta, S. ISM: general pulsars: general magnetic fields telescopes Dispersion in the interstellar medium is a well known phenomenon that follows a simple relationship, which has been used to predict the time delay of dispersed radio pulses since the late 1960s. We performed wide-band simultaneous observations of four pulsars with LOFAR (at 40-190 MHz), the 76-m Lovell Telescope (at 1400 MHz) and the Effelsberg 100-m Telescope (at 8000 MHz) to test the accuracy of the dispersion law over a broad frequency range. In this paper we present the results of these observations which show that the dispersion law is accurate to better than 1 part in 10^5 across our observing band. We use this fact to constrain some of the properties of the interstellar medium along the line-of-sight and use the lack of any aberration or retardation effects to determine upper limits on emission heights in the pulsar magnetosphere. We also discuss the effect of pulse profile evolution on our observations, and the implications that it could have for precision pulsar timing projects such as the detection of gravitational waves with pulsar timing arrays. 2012 Journal Article http://hdl.handle.net/20.500.11937/7327 10.1051/0004-6361/201218970 EDP Sciences fulltext
spellingShingle	ISM: general pulsars: general magnetic fields telescopes Hassall, T. Stappers, B. Hessels, J. Kramer, M. Alexov, A. Anderson, K. Coenen, T. Karastergiou, A. Keane, E. Kondratiev, V. Lazaridis, K. van Leeuwen, J. Noutsos, A. Serylak, M. Sobey, C. Verbiest, J. Weltevrede, P. Zagkouris, K. Fender, R. Wijers, R. Baehren, L. Bell, M. Broderick, J. Corbel, S. Daw, E. Dhillon, V. Eisloeffel, J. Falcke, H. Griessmeier, J. Jonker, P. Law, C. Markoff, S. Miller-Jones, James Osten, R. Rol, E. Scaife, A. Scheers, B. Schellart, P. Spreeuw, H. Swinbank, J. ter Veen, S. Wise, M. Wijnands, R. Wucknitz, O. Zarka, P. Asgekar, A. Bell, M. Bentum, M. BERNARDI, G. Best, P. Bonafede, A. Boonstra, A. Brentjens, M. Brouw, W. Brueggen, M. Butcher, H. Ciardi, B. Garrett, M. Gerbers, M. Gunst, A. van Haarlem, M. Heald, G. Hoeft, M. Holties, H. de Jong, A. Koopmans, L. Kuniyoshi, M. Kuper, G. Loose, G. Maat, P. Masters, J. McKean, J. Meulman, H. Mevius, M. Munk, H. Noordam, J. Orru, E. Paas, H. Pandey-Pommier, M. Pandey, V. Pizzo, R. Polatidis, A. Reich, W. Rottgering, H. Sluman, J. Steinmetz, M. Sterks, C. Tagger, M. Yang, T. Tasse, C. Vermeulen, R. van Weeren, R. Wijnholds, S. Yatawatta, S. Wide-band simultaneous observations of pulsars: disentangling dispersion measure and profile variations
title	Wide-band simultaneous observations of pulsars: disentangling dispersion measure and profile variations
title_full	Wide-band simultaneous observations of pulsars: disentangling dispersion measure and profile variations
title_fullStr	Wide-band simultaneous observations of pulsars: disentangling dispersion measure and profile variations
title_full_unstemmed	Wide-band simultaneous observations of pulsars: disentangling dispersion measure and profile variations
title_short	Wide-band simultaneous observations of pulsars: disentangling dispersion measure and profile variations
title_sort	wide-band simultaneous observations of pulsars: disentangling dispersion measure and profile variations
topic	ISM: general pulsars: general magnetic fields telescopes
url	http://hdl.handle.net/20.500.11937/7327

Wide-band simultaneous observations of pulsars: disentangling dispersion measure and profile variations

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