A study of multifrequency polarization pulse profiles of millisecond pulsars
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We present high signal-to-noise ratio, multifrequency polarization pulse profiles for 24 millisecond pulsars that are being observed as part of the Parkes Pulsar Timing Array project. The pulsars are observed in three bands, centred close to 730, 1400 and 3100 MHz, using a dual-band 10 cm/50 cm receiver and the central beam of the 20-cm multibeam receiver. Observations spanning approximately six years have been carefully calibrated and summed to produce high S/N profiles. This allows us to study the individual profile components and in particular how they evolve with frequency. We also identify previously undetected profile features. For many pulsars we show that pulsed emission extends across almost the entire pulse profile. The pulse component widths and component separations follow a complex evolution with frequency; in some cases these parameters increase and in other cases they decrease with increasing frequency. The evolution with frequency of the polarization properties of the profile is also non-trivial. We provide evidence that the pre- and post-cursors generally have higher fractional linear polarization than the main pulse. We have obtained the spectral index and rotation measure for each pulsar by fitting across all three observing bands. For the majority of pulsars, the spectra follow a single power-law and the position angles follow a λ2 relation, as expected. However, clear deviations are seen for some pulsars. We also present phase-resolved measurements of the spectral index, fractional linear polarization and rotation measure. All these properties are shown to vary systematically over the pulse profile.
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Yan, W.; Manchester, R.; Straten, W.; Reynolds, J.; Hobbs, G.; Wang, N.; Bailes, M.; Bhat, N.; Burke-Spolaor, S.; Champion, D.; Coles, W.; Hotan, Aidan; Khoo, J.; Oslowski, S.; Sarkissian, J.; Verbiest, J.; Yardley, D. (2011)Polarization profiles are presented for 20 millisecond pulsars that are being observed as part of the Parkes Pulsar Timing Array project. The observations used the Parkes multibeam receiver with a central frequency of ...
Karastergiou, A.; Johnston, S.; Andersson, N.; Breton, R.; Brook, P.; Gwinn, C.; Lewandowska, N.; Keane, E.; Kramer, M.; Macquart, Jean-Pierre; Serylak, M.; Shannon, R.; Stappers, B.; Van Leeuwen, J.; Verbiest, J.; Weltevrede, P.; Wright, G. (2014)The SKA will discover tens of thousands of pulsars and provide unprecedented data quality on these, as well as the currently known population, due to its unrivalled sensitivity. Pulsars are known to be variable on numerous ...
Kondratiev, V.; Verbiest, J.; Hessels, J.; Bilous, A.; Stappers, B.; Kramer, M.; Keane, E.; Noutsos, A.; Oslowski, S.; Breton, R.; Hassall, T.; Alexov, A.; Cooper, S.; Falcke, H.; Grießmeier, J.; Karastergiou, A.; Kuniyoshi, M.; Pilia, M.; Sobey, Charlotte; Ter Veen, S.; Van Leeuwen, J.; Weltevrede, P.; Bell, M.; Broderick, J.; Corbel, S.; Eisloffel, J.; Markoff, S.; Rowlinson, A.; Swinbank, J.; Wijers, R.; Wijnands, R.; Zarka, P. (2016)We report the detection of 48 millisecond pulsars (MSPs) out of 75 observed thus far using the LOw-Frequency ARray (LOFAR) in the frequency range 110-188 MHz. We have also detected three MSPs out of nine observed in the ...