Calibrating high-precision Faraday rotation measurements for LOFAR and the next generation of low-frequency radio telescopes (Corrigendum)

C. Sotomayor-Beltran 1 C. Sobey 2 J. W. T. Hessels 3 G. de Bruyn 3 A. Noutsos 2 A. Alexov 3 J. Anderson 4 A. Asgekar 5 I. M. Avruch 6 R. Beck 7 M. E. Bell 8, 9 M. R. Bell 10 M. J. Bentum 5 G. Bernardi 11 P. Best 12 L. Birzan 13 A. Bonafede 14 F. Breitling 15 J. Broderick 9 W. N. Brouw 16 M. Brüggen 14 B. Ciardi 17 F. de Gasperin 18 R.-J. Dettmar 1 A. van Duin 5 S. Duscha 5 J. Eislöffel 19 H. Falcke 2 R. A. Fallows 20 R. Fender 9 C. Ferrari 21 W. Frieswijk 3 M. A. Garrett 13 Jean-Mathias Grießmeier 22, 23 T. Grit 3 A. W. Gunst 5 T. E. Hassall 24 G. Heald 3 M. Hoeft 19 A. Horneffer 17 M. Iacobelli 25 E. Juette 26 A. Karastergiou 27 E. Keane 28 J. Kohler 29 M. Kramer 24, 2 V. I. Kondratiev 3 L. V. E. Koopmans 16 M. Kuniyoshi 2 G. Kuper 3 J. van Leeuwen 30 P. Maat 5 G. Macario 31 S. Markoff 30 J. P. Mckean 3 D. D. Mulcahy 9 H. Munk 5 E. Orru 3 H. Paas 32 M. Pandey-Pommier 33 M. Pilia 3 R. Pizzo 3 A. G. Polatidis 3 W. Reich 2 H. Röttgering 13 M. Serylak 34 J. Sluman 3 B. W. Stappers 24 Michel Tagger 23 Y. Tang 3 C. Tasse 35, 36 S. ter Veen 37 R. Vermeulen 3 R. J. van Weeren 38 R. A. M. J. Wijers 30 S. J. Wijnholds 3 M. W. Wise 30 O. Wucknitz 39 S. Yatawatta 3 P. Zarka 22, 35
Abstract : Faraday rotation measurements using the current and next generation of low-frequency radio telescopes will provide a powerful probe of astronomical magnetic fields. However, achieving the full potential of these measurements requires accurate removal of the time-variable ionospheric Faraday rotation contribution. We present ionFR, a code that calculates the amount of ionospheric Faraday rotation for a specific epoch, geographic location, and line-of-sight. ionFR uses a number of publicly available, GPS-derived total electron content maps and the most recent release of the International Geomagnetic Reference Field. We describe applications of this code for the calibration of radio polarimetric observations, and demonstrate the high accuracy of its modeled ionospheric Faraday rotations using LOFAR pulsar observations. These show that we can accurately determine some of the highest-precision pulsar rotation measures ever achieved. Precision rotation measures can be used to monitor rotation measure variations – either intrinsic or due to the changing line-of-sight through the interstellar medium. This calibration is particularly important for nearby sources, where the ionosphere can contribute a significant fraction of the observed rotation measure. We also discuss planned improvements to ionFR, as well as the importance of ionospheric Faraday rotation calibration for the emerging generation of low-frequency radio telescopes, such as the SKA and its pathfinders.
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C. Sotomayor-Beltran, C. Sobey, J. W. T. Hessels, G. de Bruyn, A. Noutsos, et al.. Calibrating high-precision Faraday rotation measurements for LOFAR and the next generation of low-frequency radio telescopes (Corrigendum). Astronomy and Astrophysics - A&A, EDP Sciences, 2015, 581 (A58), 13 p. ⟨10.1051/0004-6361/201220728e⟩. ⟨insu-01370009⟩

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