Wide-band, low-frequency pulse profiles of 100 radio pulsars with LOFAR

© ESO, 2016. Context. LOFAR offers the unique capability of observing pulsars across the 10-240 MHz frequency range with a fractional bandwidth of roughly 50%. This spectral range is well suited for studying the frequency evolution of pulse profile morphology caused by both intrinsic and extrinsic e...

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Main Authors:	Pilia, M., Hessels, J., Stappers, B., Kondratiev, V., Kramer, M., van Leeuwen, J., Weltevrede, P., Lyne, A., Zagkouris, K., Hassall, T., Bilous, A., Breton, R., Falcke, H., Grießmeier, J., Keane, E., Karastergiou, A., Kuniyoshi, M., Noutsos, A., Oslowski, S., Serylak, M., Sobey, C., Ter Veen, S., Alexov, A., Anderson, J., Asgekar, A., Avruch, I., Bell, M., Bentum, M., Bernardi, G., Bîrzan, L., Bonafede, A., Breitling, F., Broderick, J., Brüggen, M., Ciardi, B., Corbel, S., De Geus, E., De Jong, A., Deller, A., Duscha, S., Eislöffel, J., Fallows, R., Fender, R., Ferrari, C., Frieswijk, W., Garrett, M., Gunst, A., Hamaker, J., Heald, G., Horneffer, A., Jonker, P., Juette, E., Kuper, G., Maat, P., Mann, G., Markoff, S., McFadden, R., McKay-Bukowski, D., Miller-Jones, James, Nelles, A., Paas, H., Pandey-Pommier, M., Pietka, M., Pizzo, R., Polatidis, A., Reich, W., Röttgering, H., Rowlinson, A., Schwarz, D., Smirnov, O., Steinmetz, M., Stewart, A., Swinbank, J., Tagger, M., Tang, Y., Tasse, C., Thoudam, S., Toribio, M., Van Der Horst, A., Vermeulen, R., Vocks, C., Van Weeren, R.
Format:	Journal Article
Published:	2016
Online Access:	http://hdl.handle.net/20.500.11937/39406

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author	Pilia, M. Hessels, J. Stappers, B. Kondratiev, V. Kramer, M. van Leeuwen, J. Weltevrede, P. Lyne, A. Zagkouris, K. Hassall, T. Bilous, A. Breton, R. Falcke, H. Grießmeier, J. Keane, E. Karastergiou, A. Kuniyoshi, M. Noutsos, A. Oslowski, S. Serylak, M. Sobey, C. Ter Veen, S. Alexov, A. Anderson, J. Asgekar, A. Avruch, I. Bell, M. Bentum, M. Bernardi, G. Bîrzan, L. Bonafede, A. Breitling, F. Broderick, J. Brüggen, M. Ciardi, B. Corbel, S. De Geus, E. De Jong, A. Deller, A. Duscha, S. Eislöffel, J. Fallows, R. Fender, R. Ferrari, C. Frieswijk, W. Garrett, M. Gunst, A. Hamaker, J. Heald, G. Horneffer, A. Jonker, P. Juette, E. Kuper, G. Maat, P. Mann, G. Markoff, S. McFadden, R. McKay-Bukowski, D. Miller-Jones, James Nelles, A. Paas, H. Pandey-Pommier, M. Pietka, M. Pizzo, R. Polatidis, A. Reich, W. Röttgering, H. Rowlinson, A. Schwarz, D. Smirnov, O. Steinmetz, M. Stewart, A. Swinbank, J. Tagger, M. Tang, Y. Tasse, C. Thoudam, S. Toribio, M. Van Der Horst, A. Vermeulen, R. Vocks, C. Van Weeren, R.
author_facet	Pilia, M. Hessels, J. Stappers, B. Kondratiev, V. Kramer, M. van Leeuwen, J. Weltevrede, P. Lyne, A. Zagkouris, K. Hassall, T. Bilous, A. Breton, R. Falcke, H. Grießmeier, J. Keane, E. Karastergiou, A. Kuniyoshi, M. Noutsos, A. Oslowski, S. Serylak, M. Sobey, C. Ter Veen, S. Alexov, A. Anderson, J. Asgekar, A. Avruch, I. Bell, M. Bentum, M. Bernardi, G. Bîrzan, L. Bonafede, A. Breitling, F. Broderick, J. Brüggen, M. Ciardi, B. Corbel, S. De Geus, E. De Jong, A. Deller, A. Duscha, S. Eislöffel, J. Fallows, R. Fender, R. Ferrari, C. Frieswijk, W. Garrett, M. Gunst, A. Hamaker, J. Heald, G. Horneffer, A. Jonker, P. Juette, E. Kuper, G. Maat, P. Mann, G. Markoff, S. McFadden, R. McKay-Bukowski, D. Miller-Jones, James Nelles, A. Paas, H. Pandey-Pommier, M. Pietka, M. Pizzo, R. Polatidis, A. Reich, W. Röttgering, H. Rowlinson, A. Schwarz, D. Smirnov, O. Steinmetz, M. Stewart, A. Swinbank, J. Tagger, M. Tang, Y. Tasse, C. Thoudam, S. Toribio, M. Van Der Horst, A. Vermeulen, R. Vocks, C. Van Weeren, R.
author_sort	Pilia, M.
building	Curtin Institutional Repository
collection	Online Access
description	© ESO, 2016. Context. LOFAR offers the unique capability of observing pulsars across the 10-240 MHz frequency range with a fractional bandwidth of roughly 50%. This spectral range is well suited for studying the frequency evolution of pulse profile morphology caused by both intrinsic and extrinsic effects such as changing emission altitude in the pulsar magnetosphere or scatter broadening by the interstellar medium, respectively. Aims. The magnitude of most of these effects increases rapidly towards low frequencies. LOFAR can thus address a number of open questions about the nature of radio pulsar emission and its propagation through the interstellar medium. Methods. We present the average pulse profiles of 100 pulsars observed in the two LOFAR frequency bands: high band (120-167 MHz, 100 profiles) and low band (15-62 MHz, 26 profiles). We compare them with Westerbork Synthesis Radio Telescope (WSRT) and Lovell Telescope observations at higher frequencies (350 and 1400 MHz) to study the profile evolution. The profiles were aligned in absolute phase by folding with a new set of timing solutions from the Lovell Telescope, which we present along with precise dispersion measures obtained with LOFAR. Results. We find that the profile evolution with decreasing radio frequency does not follow a specific trend; depending on the geometry of the pulsar, new components can enter into or be hidden from view. Nonetheless, in general our observations confirm the widening of pulsar profiles at low frequencies, as expected from radius-to-frequency mapping or birefringence theories.
first_indexed	2025-11-14T08:58:36Z
format	Journal Article
id	curtin-20.500.11937-39406
institution	Curtin University Malaysia
institution_category	Local University
last_indexed	2025-11-14T08:58:36Z
publishDate	2016
recordtype	eprints
repository_type	Digital Repository
spelling	curtin-20.500.11937-394062017-09-13T14:24:12Z Wide-band, low-frequency pulse profiles of 100 radio pulsars with LOFAR Pilia, M. Hessels, J. Stappers, B. Kondratiev, V. Kramer, M. van Leeuwen, J. Weltevrede, P. Lyne, A. Zagkouris, K. Hassall, T. Bilous, A. Breton, R. Falcke, H. Grießmeier, J. Keane, E. Karastergiou, A. Kuniyoshi, M. Noutsos, A. Oslowski, S. Serylak, M. Sobey, C. Ter Veen, S. Alexov, A. Anderson, J. Asgekar, A. Avruch, I. Bell, M. Bentum, M. Bernardi, G. Bîrzan, L. Bonafede, A. Breitling, F. Broderick, J. Brüggen, M. Ciardi, B. Corbel, S. De Geus, E. De Jong, A. Deller, A. Duscha, S. Eislöffel, J. Fallows, R. Fender, R. Ferrari, C. Frieswijk, W. Garrett, M. Gunst, A. Hamaker, J. Heald, G. Horneffer, A. Jonker, P. Juette, E. Kuper, G. Maat, P. Mann, G. Markoff, S. McFadden, R. McKay-Bukowski, D. Miller-Jones, James Nelles, A. Paas, H. Pandey-Pommier, M. Pietka, M. Pizzo, R. Polatidis, A. Reich, W. Röttgering, H. Rowlinson, A. Schwarz, D. Smirnov, O. Steinmetz, M. Stewart, A. Swinbank, J. Tagger, M. Tang, Y. Tasse, C. Thoudam, S. Toribio, M. Van Der Horst, A. Vermeulen, R. Vocks, C. Van Weeren, R. © ESO, 2016. Context. LOFAR offers the unique capability of observing pulsars across the 10-240 MHz frequency range with a fractional bandwidth of roughly 50%. This spectral range is well suited for studying the frequency evolution of pulse profile morphology caused by both intrinsic and extrinsic effects such as changing emission altitude in the pulsar magnetosphere or scatter broadening by the interstellar medium, respectively. Aims. The magnitude of most of these effects increases rapidly towards low frequencies. LOFAR can thus address a number of open questions about the nature of radio pulsar emission and its propagation through the interstellar medium. Methods. We present the average pulse profiles of 100 pulsars observed in the two LOFAR frequency bands: high band (120-167 MHz, 100 profiles) and low band (15-62 MHz, 26 profiles). We compare them with Westerbork Synthesis Radio Telescope (WSRT) and Lovell Telescope observations at higher frequencies (350 and 1400 MHz) to study the profile evolution. The profiles were aligned in absolute phase by folding with a new set of timing solutions from the Lovell Telescope, which we present along with precise dispersion measures obtained with LOFAR. Results. We find that the profile evolution with decreasing radio frequency does not follow a specific trend; depending on the geometry of the pulsar, new components can enter into or be hidden from view. Nonetheless, in general our observations confirm the widening of pulsar profiles at low frequencies, as expected from radius-to-frequency mapping or birefringence theories. 2016 Journal Article http://hdl.handle.net/20.500.11937/39406 10.1051/0004-6361/201425196 fulltext
spellingShingle	Pilia, M. Hessels, J. Stappers, B. Kondratiev, V. Kramer, M. van Leeuwen, J. Weltevrede, P. Lyne, A. Zagkouris, K. Hassall, T. Bilous, A. Breton, R. Falcke, H. Grießmeier, J. Keane, E. Karastergiou, A. Kuniyoshi, M. Noutsos, A. Oslowski, S. Serylak, M. Sobey, C. Ter Veen, S. Alexov, A. Anderson, J. Asgekar, A. Avruch, I. Bell, M. Bentum, M. Bernardi, G. Bîrzan, L. Bonafede, A. Breitling, F. Broderick, J. Brüggen, M. Ciardi, B. Corbel, S. De Geus, E. De Jong, A. Deller, A. Duscha, S. Eislöffel, J. Fallows, R. Fender, R. Ferrari, C. Frieswijk, W. Garrett, M. Gunst, A. Hamaker, J. Heald, G. Horneffer, A. Jonker, P. Juette, E. Kuper, G. Maat, P. Mann, G. Markoff, S. McFadden, R. McKay-Bukowski, D. Miller-Jones, James Nelles, A. Paas, H. Pandey-Pommier, M. Pietka, M. Pizzo, R. Polatidis, A. Reich, W. Röttgering, H. Rowlinson, A. Schwarz, D. Smirnov, O. Steinmetz, M. Stewart, A. Swinbank, J. Tagger, M. Tang, Y. Tasse, C. Thoudam, S. Toribio, M. Van Der Horst, A. Vermeulen, R. Vocks, C. Van Weeren, R. Wide-band, low-frequency pulse profiles of 100 radio pulsars with LOFAR
title	Wide-band, low-frequency pulse profiles of 100 radio pulsars with LOFAR
title_full	Wide-band, low-frequency pulse profiles of 100 radio pulsars with LOFAR
title_fullStr	Wide-band, low-frequency pulse profiles of 100 radio pulsars with LOFAR
title_full_unstemmed	Wide-band, low-frequency pulse profiles of 100 radio pulsars with LOFAR
title_short	Wide-band, low-frequency pulse profiles of 100 radio pulsars with LOFAR
title_sort	wide-band, low-frequency pulse profiles of 100 radio pulsars with lofar
url	http://hdl.handle.net/20.500.11937/39406

Wide-band, low-frequency pulse profiles of 100 radio pulsars with LOFAR

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