Wide-band simultaneous observations of pulsars: disentangling dispersion measure and profile variations
T. E. HassallJodrell Bank Centre for Astrophysics, School of Physics and Astronomy, The University of Manchester, Manchester, M13 9PL, UKB. W. StappersJodrell Bank Centre for Astrophysics, School of Physics and Astronomy, The University of Manchester, Manchester, M13 9PL, UKJ. W. T. HesselsASTRON, The Netherlands Institute for Radio Astronomy, Postbus 2, 7990 AA Dwingeloo, The NetherlandsM. KrämerJodrell Bank Centre for Astrophysics, School of Physics and Astronomy, The University of Manchester, Manchester, M13 9PL, UKA. AlexovAstronomical Institute “Anton Pannekoek”, University of Amsterdam, Science Park 904, 1098 XH Amsterdam, The NetherlandsKevin D. AndersonAstronomical Institute “Anton Pannekoek”, University of Amsterdam, Science Park 904, 1098 XH Amsterdam, The NetherlandsThijs CoenenAstronomical Institute “Anton Pannekoek”, University of Amsterdam, Science Park 904, 1098 XH Amsterdam, The NetherlandsA. KarastergiouAstrophysics, University of Oxford, Denys Wilkinson Building, Keble Road, Oxford OX1 3RH, UKE. F. KeaneMax-Planck-Institut für Radioastronomie, Auf dem Hügel 69, 53121 Bonn, GermanyV. I. KondratievASTRON, The Netherlands Institute for Radio Astronomy, Postbus 2, 7990 AA Dwingeloo, The NetherlandsK. LazaridisMax-Planck-Institut für Radioastronomie, Auf dem Hügel 69, 53121 Bonn, GermanyJ. van LeeuwenASTRON, The Netherlands Institute for Radio Astronomy, Postbus 2, 7990 AA Dwingeloo, The NetherlandsA. NoutsosMax-Planck-Institut für Radioastronomie, Auf dem Hügel 69, 53121 Bonn, GermanyM. SerylakStation de Radioastronomie de Nançay, Observatoire de Paris, CNRS/INSU, 18330 Nançay, FranceC. SobeyMax-Planck-Institut für Radioastronomie, Auf dem Hügel 69, 53121 Bonn, GermanyJ. P. W. VerbiestMax-Planck-Institut für Radioastronomie, Auf dem Hügel 69, 53121 Bonn, GermanyP. WeltevredeJodrell Bank Centre for Astrophysics, School of Physics and Astronomy, The University of Manchester, Manchester, M13 9PL, UKK. ZagkourisAstrophysics, University of Oxford, Denys Wilkinson Building, Keble Road, Oxford OX1 3RH, UKR. P. FenderSchool of Physics and Astronomy, University of Southampton, Southampton, SO17 1BJ, UKR. A. M. J. WijersAstronomical Institute “Anton Pannekoek”, University of Amsterdam, Science Park 904, 1098 XH Amsterdam, The NetherlandsL. BährenAstronomical Institute “Anton Pannekoek”, University of Amsterdam, Science Park 904, 1098 XH Amsterdam, The NetherlandsM. E. BellMax Planck Institute for Astrophysics, Karl Schwarzschild Str. 1, 85741 Garching, GermanyJ. W. BroderickSchool of Physics and Astronomy, University of Southampton, Southampton, SO17 1BJ, UKS. CorbelInstitut Universitaire de France, 75005 Paris, FranceE. J. DawDepartment of Physics & Astronomy, University of Sheffield, Sheffield S3 7RH, UKV. S. DhillonDepartment of Physics & Astronomy, University of Sheffield, Sheffield S3 7RH, UKJ. EislöffelThüringer Landessternwarte, Sternwarte 5, 07778 Tautenburg, GermanyH. FalckeASTRON, The Netherlands Institute for Radio Astronomy, Postbus 2, 7990 AA Dwingeloo, The NetherlandsJ.‐M. GrießmeierLaboratoire de Physique et Chimie de l’Environnement et de l’Espace, LPC2E UMR 7328 CNRS, 45071 Orléans Cedex 02, FranceP. G. JonkerDepartment of Astrophysics, IMAPP, Radboud University Nijmegen, PO Box 9010, 6500 GL Nijmegen, The NetherlandsC. J. LawAstronomical Institute “Anton Pannekoek”, University of Amsterdam, Science Park 904, 1098 XH Amsterdam, The NetherlandsSera MarkoffAstronomical Institute “Anton Pannekoek”, University of Amsterdam, Science Park 904, 1098 XH Amsterdam, The NetherlandsJames C. A. Miller-JonesAstronomical Institute “Anton Pannekoek”, University of Amsterdam, Science Park 904, 1098 XH Amsterdam, The NetherlandsRachel A. OstenSpace Telescope Science Institute, Baltimore, MD 21218, USAE. RolAstronomical Institute “Anton Pannekoek”, University of Amsterdam, Science Park 904, 1098 XH Amsterdam, The NetherlandsA. ScaifeSchool of Physics and Astronomy, University of Southampton, Southampton, SO17 1BJ, UKB. ScheersAstronomical Institute “Anton Pannekoek”, University of Amsterdam, Science Park 904, 1098 XH Amsterdam, The NetherlandsP. SchellartDepartment of Astrophysics, IMAPP, Radboud University Nijmegen, PO Box 9010, 6500 GL Nijmegen, The NetherlandsHanno SpreeuwAstronomical Institute “Anton Pannekoek”, University of Amsterdam, Science Park 904, 1098 XH Amsterdam, The NetherlandsJ. SwinbankAstronomical Institute “Anton Pannekoek”, University of Amsterdam, Science Park 904, 1098 XH Amsterdam, The NetherlandsS. ter VeenDepartment of Astrophysics, IMAPP, Radboud University Nijmegen, PO Box 9010, 6500 GL Nijmegen, The NetherlandsM. W. WiseASTRON, The Netherlands Institute for Radio Astronomy, Postbus 2, 7990 AA Dwingeloo, The NetherlandsR. WijnandsAstronomical Institute “Anton Pannekoek”, University of Amsterdam, Science Park 904, 1098 XH Amsterdam, The NetherlandsO. WucknitzArgelander-Institut für Astronomie, Universität Bonn, Auf dem Hügel 71, 53121 Bonn, GermanyP. ZarkaLESIA, Observatoire de Paris, CNRS, UPMC Université Paris-Diderot, 5 place Jules Janssen, 92195 Meudon, FranceA. AsgekarASTRON, The Netherlands Institute for Radio Astronomy, Postbus 2, 7990 AA Dwingeloo, The NetherlandsM. R. BellMax Planck Institute for Astrophysics, Karl Schwarzschild Str. 1, 85741 Garching, GermanyMarinus Jan BentumASTRON, The Netherlands Institute for Radio Astronomy, Postbus 2, 7990 AA Dwingeloo, The NetherlandsG. BernardiHarvard-Smithsonian Center for Astrophysics, Garden Street 60, Cambridge, MA 02138, USAP. N. BestInstitute for Astronomy, University of Edinburgh, Royal Observatory of Edinburgh, Blackford Hill, Edinburgh EH9 3HJ, UKA. BonafedeJacobs University Bremen, Campus Ring 1, 28759 Bremen, GermanyAlbert‐Jan BoonstraASTRON, The Netherlands Institute for Radio Astronomy, Postbus 2, 7990 AA Dwingeloo, The NetherlandsM. A. BrentjensASTRON, The Netherlands Institute for Radio Astronomy, Postbus 2, 7990 AA Dwingeloo, The NetherlandsW. N. BrouwM. BrüggenJacobs University Bremen, Campus Ring 1, 28759 Bremen, GermanyH. R. ButcherASTRON, The Netherlands Institute for Radio Astronomy, Postbus 2, 7990 AA Dwingeloo, The NetherlandsB. CiardiMax Planck Institute for Astrophysics, Karl Schwarzschild Str. 1, 85741 Garching, GermanyM. A. GarrettASTRON, The Netherlands Institute for Radio Astronomy, Postbus 2, 7990 AA Dwingeloo, The NetherlandsM. GerbersASTRON, The Netherlands Institute for Radio Astronomy, Postbus 2, 7990 AA Dwingeloo, The NetherlandsA. W. GunstASTRON, The Netherlands Institute for Radio Astronomy, Postbus 2, 7990 AA Dwingeloo, The NetherlandsM. P. van HaarlemASTRON, The Netherlands Institute for Radio Astronomy, Postbus 2, 7990 AA Dwingeloo, The NetherlandsG. HealdASTRON, The Netherlands Institute for Radio Astronomy, Postbus 2, 7990 AA Dwingeloo, The NetherlandsM. HoeftThüringer Landessternwarte, Sternwarte 5, 07778 Tautenburg, GermanyH. A. HoltiesASTRON, The Netherlands Institute for Radio Astronomy, Postbus 2, 7990 AA Dwingeloo, The NetherlandsA. de JongASTRON, The Netherlands Institute for Radio Astronomy, Postbus 2, 7990 AA Dwingeloo, The NetherlandsL. V. E. KoopmansM. KuniyoshiMax-Planck-Institut für Radioastronomie, Auf dem Hügel 69, 53121 Bonn, GermanyG. KüperASTRON, The Netherlands Institute for Radio Astronomy, Postbus 2, 7990 AA Dwingeloo, The NetherlandsG. M. LooseASTRON, The Netherlands Institute for Radio Astronomy, Postbus 2, 7990 AA Dwingeloo, The NetherlandsP. MaatASTRON, The Netherlands Institute for Radio Astronomy, Postbus 2, 7990 AA Dwingeloo, The NetherlandsJ. MastersNRAO Headquarters, 520 Edgemont Road, Charlottesville, VA 22903, USAJ. P. McKeanASTRON, The Netherlands Institute for Radio Astronomy, Postbus 2, 7990 AA Dwingeloo, The NetherlandsH. MeulmanASTRON, The Netherlands Institute for Radio Astronomy, Postbus 2, 7990 AA Dwingeloo, The NetherlandsM. MeviusASTRON, The Netherlands Institute for Radio Astronomy, Postbus 2, 7990 AA Dwingeloo, The NetherlandsH. MunkASTRON, The Netherlands Institute for Radio Astronomy, Postbus 2, 7990 AA Dwingeloo, The NetherlandsJ. E. NoordamASTRON, The Netherlands Institute for Radio Astronomy, Postbus 2, 7990 AA Dwingeloo, The NetherlandsE. OrrúDepartment of Astrophysics, IMAPP, Radboud University Nijmegen, PO Box 9010, 6500 GL Nijmegen, The NetherlandsH. PaasASTRON, The Netherlands Institute for Radio Astronomy, Postbus 2, 7990 AA Dwingeloo, The NetherlandsM. Pandey-PommierCentre de Recherche Astrophysique de Lyon, Observatoire de Lyon, 9 Av. Charles André, 69561 Saint Genis Laval Cedex, FranceV. N. PandeyASTRON, The Netherlands Institute for Radio Astronomy, Postbus 2, 7990 AA Dwingeloo, The NetherlandsR. PizzoASTRON, The Netherlands Institute for Radio Astronomy, Postbus 2, 7990 AA Dwingeloo, The NetherlandsA. G. PolatidisASTRON, The Netherlands Institute for Radio Astronomy, Postbus 2, 7990 AA Dwingeloo, The NetherlandsW. ReichMax-Planck-Institut für Radioastronomie, Auf dem Hügel 69, 53121 Bonn, GermanyH. J. A. RöttgeringLeiden Observatory, Leiden University, PO Box 9513, 2300 RA Leiden, The NetherlandsJ. SlumanASTRON, The Netherlands Institute for Radio Astronomy, Postbus 2, 7990 AA Dwingeloo, The NetherlandsMatthias SteinmetzLeibniz-Institut fr Astrophysik Potsdam (AIP), An der Sternwarte 16, 14482 Potsdam, GermanyC. G. M. SterksCenter for Information Technology (CIT), University of Groningen, The NetherlandsM. TaggerLaboratoire de Physique et Chimie de l’Environnement et de l’Espace, LPC2E UMR 7328 CNRS, 45071 Orléans Cedex 02, FranceY. TangASTRON, The Netherlands Institute for Radio Astronomy, Postbus 2, 7990 AA Dwingeloo, The NetherlandsC. TasseObservatoire de ParisR. C. VermeulenASTRON, The Netherlands Institute for Radio Astronomy, Postbus 2, 7990 AA Dwingeloo, The NetherlandsR. J. van WeerenASTRON, The Netherlands Institute for Radio Astronomy, Postbus 2, 7990 AA Dwingeloo, The NetherlandsStefan J. WijnholdsASTRON, The Netherlands Institute for Radio Astronomy, Postbus 2, 7990 AA Dwingeloo, The NetherlandsS. Yatawatta
2012en
ABI
Аннотация
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 105 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.
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