Wide-band, low-frequency pulse profiles of 100 radio pulsars with LOFAR

M. Pilia 1 J.W.T. Hessels 2 B.W Stappers 3 V.I. Kondratiev 2 M Kramer 4 J Van Leeuwen 5 P Weltevrede 3 A Lyne 3 K Zagkouris 6 T.E. Hassall 7 A.V. Bilous 8 R.P. Breton 7 H Falcke 1 Jean-Mathias Grießmeier 9, 10 E Keane 11 A Karastergiou 12 M Kuniyoshi 13 A Noutsos 13 S. Osłowski 14 M. Serylak 15 C. Sobey 1 S Ter Veen 2 A Alexov 16 A Anderson 17 A Asgekar 2 A Avruch 18 M Bell 19 M Bentum 2 G Bernardi 20 L. Bîrzan 21 A Bonafede 22 B Breitling 23 J Broderick 6 M Brüggen 24 C Ciardi 25 Stéphane Corbel 26, 10 D De Geus 1 A De Jong 27 A Deller 1 S Duscha 2 J Eislöffel 28 R Fallows 29 R Fender 30 C Ferrari 31 W Frieswijk 2 M.A Garrett 1 A Gunst 2 J.P. Hamaker 1 H Heald 1 A Horneffer 13 P Jonker 18 J Juette 32 G Kuper 2 P Maat 2 M Mann 33 S Markoff 5 R Mcfadden 2 D. Mckay-Bukowski 34 C Miller-Jones 35 A Nelles 36 H. Paas 37 M Pandey-Pommier 38 M. Pietka 6 P Pizzo 1 P Polatidis 38 R Reich 13 R Röttgering 21 A. Rowlinson 39 S Schwarz 40 O Smirnov 41 S Steinmetz 42 S Stewart 43 S Swinbank 44 Michel Tagger 9 Y Tang 45 C Tasse 46 S Thoudam 47 C Toribio 1 A Van Der Horst 5 R Vermeulen 2 C Vocks 48 R Van Weeren 18 R.A.M.J Wijers 49 R Wijnands 5 S Wijnholds 1 O Wucknitz 50 P Zarka 46
Abstract : Context. LOFAR offers the unique capability of observing pulsars across the 10−240 MHz frequency range with a fractional bandwidth of roughly 50%. This spectral range is well suited for studying the frequency evolution of pulse profile morphology caused by both intrinsic and extrinsic effects such as changing emission altitude in the pulsar magnetosphere or scatter broadening by the interstellar medium, respectively. Aims. The magnitude of most of these effects increases rapidly towards low frequencies. LOFAR can thus address a number of open questions about the nature of radio pulsar emission and its propagation through the interstellar medium. Methods. We present the average pulse profiles of 100 pulsars observed in the two LOFAR frequency bands: high band (120–167 MHz, 100 profiles) and low band (15–62 MHz, 26 profiles). We compare them with Westerbork Synthesis Radio Telescope (WSRT) and Lovell Telescope observations at higher frequencies (350 and 1400 MHz) to study the profile evolution. The profiles were aligned in absolute phase by folding with a new set of timing solutions from the Lovell Telescope, which we present along with precise dispersion measures obtained with LOFAR. Results. We find that the profile evolution with decreasing radio frequency does not follow a specific trend; depending on the geometry of the pulsar, new components can enter into or be hidden from view. Nonetheless, in general our observations confirm the widening of pulsar profiles at low frequencies, as expected from radius-to-frequency mapping or birefringence theories.
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Astronomy and Astrophysics - A&A, EDP Sciences, 2016, 586 (A92), 34 p. 〈10.1051/0004-6361/201425196〉
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M. Pilia, J.W.T. Hessels, B.W Stappers, V.I. Kondratiev, M Kramer, et al.. Wide-band, low-frequency pulse profiles of 100 radio pulsars with LOFAR. Astronomy and Astrophysics - A&A, EDP Sciences, 2016, 586 (A92), 34 p. 〈10.1051/0004-6361/201425196〉. 〈insu-01467174〉

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