Journal articles
Low-frequency Faraday rotation measures towards pulsars using LOFAR: probing the 3D Galactic halo magnetic field
C. Sobey
1
A. Bilous
2
Jean-Mathias Grießmeier
3, 4
J W T Hessels
A Karastergiou
E F Keane
V I Kondratiev
M Kramer
D Michilli
A. Noutsos
1
M Pilia
E J Polzin
B W Stappers
C Tan
J Van leeuwen
J P W Verbiest
P Weltevrede
G Heald
M I R Alves
E Carretti
T Enßlin
M Haverkorn
M Iacobelli
W Reich
C van Eck
C. Sobey 1
Author
A. Bilous 2
Author
Jean-Mathias Grießmeier 3, 4
Author Employer institution : Université d'Orléans IdHAL : jean-mathias-griessmeier IdRef : https://www.idref.fr/235780871 ORCID : https://orcid.org/0000-0003-3362-7996 VIAF : https://viaf.org/viaf/20837572 ISNI : http://isni.org/isni/0000000020640428
J W T Hessels
Author
C van Eck
Author
1
MPIFR - Max-Planck-Institut für Radioastronomie (Auf dem Hügel 69 D-53121 Bonn - Germany)
2
IMAPP - Institute for Mathematics, Astrophysics and Particle Physics (P.O. Box 9010, 6500 GL Nijmegen - Netherlands)
- Radboud university [Nijmegen] (Comeniuslaan 4, 6525 HP Nijmegen - Netherlands)
3
LPC2E - Laboratoire de Physique et Chimie de l'Environnement et de l'Espace (3A, Avenue de la Recherche Scientifique 45071 Orléans cedex 2 - France)
- OSUC - Observatoire des Sciences de l'Univers en région Centre : UMS3116 (Campus Géosciences, 1A rue de la Férollerie, 45071 Orléans - France)
- INSU - CNRS - Institut national des sciences de l'Univers (INSU-CNRS 3 rue Michel-Ange, 75794 Paris Cedex 16 - France)
- Observatoire de Paris (61 Av de l'Observatoire 75014 PARIS - France)
- PSL - Université Paris sciences et lettres (60 rue Mazarine 75006 Paris - France)
- UO - Université d'Orléans (Château de la Source - Avenue du Parc Floral - BP 6749 - 45067 Orléans cedex 2 - France)
- CNRS - Centre National de la Recherche Scientifique : UAR3116 / UMS3116 (France)
- CNES - Centre National d’Études Spatiales [Paris] : UMR 7328 (Siège social : 2 place Maurice Quentin, 75039 Paris - France)
4
USN - Unité Scientifique de la Station de Nançay (18330 NANCAY - France)
- INSU - CNRS - Institut national des sciences de l'Univers : USR704 (INSU-CNRS 3 rue Michel-Ange, 75794 Paris Cedex 16 - France)
- Observatoire de Paris : USR 704 (61 Av de l'Observatoire 75014 PARIS - France)
- PSL - Université Paris sciences et lettres (60 rue Mazarine 75006 Paris - France)
- OSUC - Observatoire des Sciences de l'Univers en région Centre (Campus Géosciences, 1A rue de la Férollerie, 45071 Orléans - France)
- INSU - CNRS - Institut national des sciences de l'Univers (INSU-CNRS 3 rue Michel-Ange, 75794 Paris Cedex 16 - France)
- Observatoire de Paris (61 Av de l'Observatoire 75014 PARIS - France)
- PSL - Université Paris sciences et lettres (60 rue Mazarine 75006 Paris - France)
- UO - Université d'Orléans (Château de la Source - Avenue du Parc Floral - BP 6749 - 45067 Orléans cedex 2 - France)
- CNRS - Centre National de la Recherche Scientifique : UAR3116 / UMS3116 (France)
- CNRS - Centre National de la Recherche Scientifique : UAR704 / USR704 (France)
- UO - Université d'Orléans : USR 704 (Château de la Source - Avenue du Parc Floral - BP 6749 - 45067 Orléans cedex 2 - France)
Abstract : 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 approximate to 0.1 rad m(-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(-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 +/- 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 3D structure of the Galactic magnetic field.
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Journal articles
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https://hal-insu.archives-ouvertes.fr/insu-02149819
Contributor : Nathalie Pothier Connect in order to contact the contributor
Submitted on : Monday, September 9, 2019 - 4:46:14 PM
Last modification on : Wednesday, May 11, 2022 - 12:44:02 PM
Long-term archiving on: : Friday, February 7, 2020 - 11:15:12 PM
Contributor : Nathalie Pothier Connect in order to contact the contributor
Submitted on : Monday, September 9, 2019 - 4:46:14 PM
Last modification on : Wednesday, May 11, 2022 - 12:44:02 PM
Long-term archiving on: : Friday, February 7, 2020 - 11:15:12 PM
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stz214.pdf
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Identifiers
- HAL Id : insu-02149819, version 1
- ARXIV : 1901.07738
- BIBCODE : 2019MNRAS.484.3646S
- DOI : 10.1093/mnras/stz214
Citation
C. Sobey, A. Bilous, Jean-Mathias Grießmeier, J W T Hessels, A Karastergiou, et al.. Low-frequency Faraday rotation measures towards pulsars using LOFAR: probing the 3D Galactic halo magnetic field. 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⟩. ⟨insu-02149819⟩
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