Zobrazeno 1 - 9 of 9 pro vyhledávání: '"A. G. J. van Leeuwen"'
1
Probing drifting and nulling mechanisms through their interaction in PSR B0809+74
Autor: Ben Stappers, R. Ramachandran, A. G. J. van Leeuwen, Joanna M. Rankin
Publikováno v: Astronomy & Astrophysics, 399, 223-229. EDP Sciences
Both nulling and subpulse drifting are poorly understood phenomena. We probe their mechanisms by investigating how they interact in PSR B0809+74. We find that the subpulse drift is not aliased but directly reflects the actual motion of the subbeams.
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::55fa5b0e69d9ae126a1356117e8a2acb
https://doi.org/10.1051/0004-6361:20021630
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2
LOFAR observations of PSR B0943+10: profile evolution and discovery of a systematically changing profile delay in Bright mode
Autor: Jason W. T. Hessels, V. I. Kondratiev, Tim Hassall, A. G. J. van Leeuwen, Evan Keane, Patrick Weltevrede, J.-M. Grießmeier, M. Serylak, M. Pilia, Heino Falcke, Anna V. Bilous, Michael Kramer, Ben Stappers
Publikováno v: Astronomy & Astrophysics, 572:A52. EDP Sciences
Astronomy and Astrophysics-A&A
Astronomy and Astrophysics-A&A, EDP Sciences, 2014, 572, 15 p. ⟨10.1051/0004-6361/201424425⟩
Astronomy & Astrophysics, 572, pp. A52(1)-A52(140
Astronomy & Astrophysics, 572, A52(1)-A52(140
Astronomy and Astrophysics-A&A, 2014, 572, 15 p. ⟨10.1051/0004-6361/201424425⟩
We present broadband, low-frequency (25-80 MHz and 110-190 MHz) LOFAR observations of PSR B0943+10, with the goal of better illuminating the nature of its enigmatic mode-switching behaviour. This pulsar shows two relatively stable states: a Bright (B
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::07deb09ccfa09c5953747e4572561865
http://arxiv.org/abs/1408.5272
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3
Pulsars with the Australian Square Kilometre Array Pathfinder
Autor: I. H. Stairs, M. J. Keith, Z. Arzoumanian, W. Becker, A. Berndsen, A. Bouchard, N. D. R. Bhat, M. Burgay, D. J. Champion, S. Chatterjee, T. Colegate, J. M. Cordes, F. M. Crawford, R. Dodson, P. C. C. Freire, G. B. Hobbs, A. W. Hotan, S. Johnston, V. M. Kaspi, V. Kondratiev, M. Kramer, T. J. W. Lazio, W. Majid, R. N. Manchester, D. J. Nice, A. Pellizzoni, A. Possenti, S. M. Ransom, N. Rea, R. Shannon, R. Smits, B. W. Stappers, D. F. Torres, A. G. J. van Leeuwen, W. van Straten, P. Weltevrede, Marta Burgay, Nicolò D’Amico, Paolo Esposito, Alberto Pellizzoni, Andrea Possenti
Publikováno v: Radio Pulsars: An Astrophysical Key to Unlock the Secrets of the Universe: Chia (Sardinia), Italy, 10-15 October 2010, 335-340
STARTPAGE=335;ENDPAGE=340;TITLE=Radio Pulsars: An Astrophysical Key to Unlock the Secrets of the Universe
The Australian Square Kilometre Array Pathfinder (ASKAP) is a 36-element array with a 30-square-degree field of view being built at the proposed SKA site in Western Australia. We are conducting a Design Study for pulsar observations with ASKAP, plann
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::e6fb5a7fe7556d4920af42e5a29acb25
https://hdl.handle.net/11245/1.357785
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4
Unusual Subpulse Modulation in PSR B0320+39
Autor: Ben Stappers, Russell T. Edwards, A. G. J. van Leeuwen
Publikováno v: Astronomy & Astrophysics, 402, 321-329. EDP Sciences
We report on an analysis of the drifting subpulses of PSR B0320+39 that indicates a sudden step of ~180 degrees in subpulse phase near the centre of the pulse profile. The phase step, in combination with the attenuation of the periodic subpulse modul
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::5bba1dd5307529f5d7214d9d6a378432
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5
V|: new insight into the circular polarization of radio pulsars
Autor: Dipanjan Mitra, Aris Karastergiou, Simon Johnston, Russell T. Edwards, A. G. J. van Leeuwen
Publikováno v: Monthly Notices of the Royal Astronomical Society, 344(4), L69-L73. Oxford University Press
We present a study of single pulses from nine bright northern pulsars to investigate the behaviour of circular polarisation, V. The observations were conducted with the Effelsberg 100-m radio telescope at 1.41 GHz and 4.85 GHz and the Westerbork radi
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::3de2f25ced4f14a956291ce22cc78531
https://dare.uva.nl/personal/pure/en/publications/v-new-insight-into-the-circular-polarization-of-radio-pulsars(8ab8d831-4736-4ebb-9ff2-fd83133e823d).html
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6
Pulsar 'drifting'-subpulse polarization: No evidence for systematic polarization-angle rotations
Autor: Ben Stappers, M. L. A. Kouwenhoven, R. Ramachandran, Joanna M. Rankin, A. G. J. van Leeuwen
Publikováno v: Astronomy & Astrophysics, 381, 993-999. EDP Sciences
Polarization-angle density displays are given for pulsars B0809+74 and B2303+30, which exhibit no evidence of the systematic polarization-angle rotation within individual subpulses previously reported for these two stars. The ``drifting'' subpulses o
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::a2ae12166d7911601fc212f1934da05f
https://dare.uva.nl/personal/pure/en/publications/pulsar-driftingsubpulse-polarization-no-evidence-for-systematic-polarizationangle-rotations(5f63e0ca-5a56-49e5-ac89-d592d25c95aa).html
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7
Null-induced mode changes in PSR B0809+74
Autor: Ben Stappers, M. L. A. Kouwenhoven, R. Ramachandran, Joanna M. Rankin, A. G. J. van Leeuwen
Publikováno v: Astronomy & Astrophysics, 387, 169-178. EDP Sciences
We have found that there are two distinct emission modes in PSR B0809+74. Beside its normal and most common mode, the pulsar emits in a significantly different quasi-stable mode after most or possibly all nulls, occasionally for over 100 pulses. In t
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::22004ca41f37debb409c8362b90869e7
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