Low-frequency Faraday rotation measures towards pulsars using LOFAR: probing the 3D Galactic halo magnetic field
| Autor: | V. I. Kondratiev, Anna V. Bilous, George Heald, Benjamin Stappers, C. L. Van Eck, Daniele Michilli, W. Reich, A. Noutsos, M. Iacobelli, Michael Kramer, Charlotte Sobey, E. J. Polzin, M. I. R. Alves, Torsten A. Enßlin, Aris Karastergiou, Patrick Weltevrede, Maura Pilia, Jason W. T. Hessels, J. van Leeuwen, C. M. Tan, J.-M. Grießmeier, Marijke Haverkorn, Ettore Carretti, Joris P. W. Verbiest, Evan Keane |
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| Přispěvatelé: | Max-Planck-Institut für Radioastronomie (MPIFR), Institute for Mathematics, Astrophysics and Particle Physics (IMAPP), Radboud university [Nijmegen], Laboratoire de Physique et Chimie de l'Environnement et de l'Espace (LPC2E), Observatoire des Sciences de l'Univers en région Centre (OSUC), Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Université d'Orléans (UO)-Observatoire de Paris, Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Université d'Orléans (UO)-Observatoire de Paris, Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Centre National d’Études Spatiales [Paris] (CNES), Unité Scientifique de la Station de Nançay (USN), Centre National de la Recherche Scientifique (CNRS)-Observatoire de Paris, Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire des Sciences de l'Univers en région Centre (OSUC), Université Paris sciences et lettres (PSL)-Université d'Orléans (UO), European Project: 337062,EC:FP7:ERC,ERC-2013-StG,DRAGNET(2014), European Project: 617199,EC:FP7:ERC,ERC-2013-CoG,ALERT(2014), Radboud University [Nijmegen], Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire de Paris, Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université d'Orléans (UO)-Centre National de la Recherche Scientifique (CNRS)-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire de Paris, Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université d'Orléans (UO)-Centre National de la Recherche Scientifique (CNRS)-Centre National d’Études Spatiales [Paris] (CNES), Université Paris sciences et lettres (PSL)-Université d'Orléans (UO)-Centre National de la Recherche Scientifique (CNRS), High Energy Astrophys. & Astropart. Phys (API, FNWI) |
| Jazyk: | angličtina |
| Rok vydání: | 2019 |
| Předmět: |
Astronomy
FOS: Physical sciences Astrophysics Astrophysics::Cosmology and Extragalactic Astrophysics general [pulsars] 01 natural sciences law.invention Galactic halo Radio telescope symbols.namesake Pulsar law pulsars: general polarimetric [techniques] 0103 physical sciences Faraday effect Faraday cage Instrumentation and Methods for Astrophysics (astro-ph.IM) 010303 astronomy & astrophysics Galaxy: structure Astrophysics::Galaxy Astrophysics Physics [PHYS]Physics [physics] 010308 nuclear & particles physics magnetic fields [ISM] Astrophysics::Instrumentation and Methods for Astrophysics Astronomy and Astrophysics Scale height LOFAR Galactic plane Astrophysics - Astrophysics of Galaxies techniques: polarimetric Space and Planetary Science [SDU]Sciences of the Universe [physics] Astrophysics of Galaxies (astro-ph.GA) symbols ISM: magnetic fields radio telescopes Astrophysics - Instrumentation and Methods for Astrophysics [PHYS.ASTR]Physics [physics]/Astrophysics [astro-ph] structure [Galaxy] |
| Zdroj: | Monthly Notices of the Royal Astronomical Society Monthly Notices of the Royal Astronomical Society, Oxford University Press (OUP): Policy P-Oxford Open Option A, 2019, 484 (3), pp.3646-3664. ⟨10.1093/mnras/stz214⟩ Monthly Notices of the Royal Astronomical Society, 484, 3646-3664 Sobey, C, Bilous, A V, Griessmeier, J, Hessels, J W T, Karastergiou, A, Keane, E F, Kondratiev, V I, Kramer, M, Michilli, D, Noutsos, A, Pilia, M, Polzin, E, Stappers, B, Tan, C M, van Leeuwen, J, Verbiest, J P W, Weltevrede, P, Heald, G, Alves, M I R, Carretti, E, Ensslin, T, Haverkorn, M, Iacobelli, M, Reich, W & Van Eck, C 2019, ' Low-frequency Faraday rotation measures towards pulsars using LOFAR: probing the 3-D Galactic halo magnetic field ', Monthly Notices of the Royal Astronomical Society . https://doi.org/10.1093/mnras/stz214 Monthly Notices of the Royal Astronomical Society, 2019, 484 (3), pp.3646-3664. ⟨10.1093/mnras/stz214⟩ Monthly Notices of the Royal Astronomical Society, 484(3), 3646-3664. Oxford University Press Monthly Notices of the Royal Astronomical Society, 484, 3, pp. 3646-3664 |
| ISSN: | 0035-8711 1365-2966 |
| DOI: | 10.1093/mnras/stz214⟩ |
| Popis: | We determined Faraday rotation measures (RMs) towards 137 pulsars in the northern sky, using Low-Frequency Array (LOFAR) observations at 110-190 MHz. This low-frequency RM catalogue, the largest to date, improves the precision of existing RM measurements on average by a factor of 20 - due to the low frequency and wide bandwidth of the data, aided by the RM synthesis method. We report RMs towards 25 pulsars for the first time. The RMs were corrected for ionospheric Faraday rotation to increase the accuracy of our catalogue to approximately 0.1 rad m$^{\rm -2}$. The ionospheric RM correction is currently the largest contributor to the measurement uncertainty. In addition, we find that the Faraday dispersion functions towards pulsars are extremely Faraday thin - mostly less than 0.001 rad m$^{\rm -2}$. We use these new precise RM measurements (in combination with existing RMs, dispersion measures, and distance estimates) to estimate the scale height of the Galactic halo magnetic field: 2.0$\pm$0.3 kpc for Galactic quadrants I and II above and below the Galactic plane (we also evaluate the scale height for these regions individually). Overall, our initial low-frequency catalogue provides valuable information about the 3-D structure of the Galactic magnetic field. 31 pages, including 13 figures, 6 tables. Accepted for publication in MNRAS |
| Databáze: | OpenAIRE |
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