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

    238056_238056.pdf (2.576Mb)
    Access Status
    Open access
    Authors
    Pilia, M.
    Hessels, J.
    Stappers, B.
    Kondratiev, V.
    Kramer, M.
    van Leeuwen, J.
    Weltevrede, P.
    Lyne, A.
    Zagkouris, K.
    Hassall, T.
    Bilous, A.
    Breton, R.
    Falcke, H.
    Grießmeier, J.
    Keane, E.
    Karastergiou, A.
    Kuniyoshi, M.
    Noutsos, A.
    Oslowski, S.
    Serylak, M.
    Sobey, C.
    Ter Veen, S.
    Alexov, A.
    Anderson, J.
    Asgekar, A.
    Avruch, I.
    Bell, M.
    Bentum, M.
    Bernardi, G.
    Bîrzan, L.
    Bonafede, A.
    Breitling, F.
    Broderick, J.
    Brüggen, M.
    Ciardi, B.
    Corbel, S.
    De Geus, E.
    De Jong, A.
    Deller, A.
    Duscha, S.
    Eislöffel, J.
    Fallows, R.
    Fender, R.
    Ferrari, C.
    Frieswijk, W.
    Garrett, M.
    Gunst, A.
    Hamaker, J.
    Heald, G.
    Horneffer, A.
    Jonker, P.
    Juette, E.
    Kuper, G.
    Maat, P.
    Mann, G.
    Markoff, S.
    McFadden, R.
    McKay-Bukowski, D.
    Miller-Jones, James
    Nelles, A.
    Paas, H.
    Pandey-Pommier, M.
    Pietka, M.
    Pizzo, R.
    Polatidis, A.
    Reich, W.
    Röttgering, H.
    Rowlinson, A.
    Schwarz, D.
    Smirnov, O.
    Steinmetz, M.
    Stewart, A.
    Swinbank, J.
    Tagger, M.
    Tang, Y.
    Tasse, C.
    Thoudam, S.
    Toribio, M.
    Van Der Horst, A.
    Vermeulen, R.
    Vocks, C.
    Van Weeren, R.
    Date
    2016
    Type
    Journal Article
    
    Metadata
    Show full item record
    Citation
    Pilia, M. and Hessels, J. and Stappers, B. and Kondratiev, V. and Kramer, M. and van Leeuwen, J. and Weltevrede, P. et al. 2016. Wide-band, low-frequency pulse profiles of 100 radio pulsars with LOFAR. Astronomy and Astrophysics. 586 (A92).
    Source Title
    Astronomy and Astrophysics
    DOI
    10.1051/0004-6361/201425196
    ISSN
    0004-6361
    School
    Department of Physics and Astronomy
    Remarks

    Reproduced with permission from Astronomy & Astrophysics, © ESO

    URI
    http://hdl.handle.net/20.500.11937/39406
    Collection
    • Curtin Research Publications
    Abstract

    © ESO, 2016. 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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