Multifrequency integrated profiles of pulsars

Johnston, Simon ; Karastergiou, Aris ; Mitra, Dipanjan ; Gupta, Yashwant (2008) Multifrequency integrated profiles of pulsars Monthly Notices of the Royal Astronomical Society, 388 (1). pp. 261-274. ISSN 0035-8711

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We have observed a total of 67 pulsars at five frequencies ranging from 243 to 3100 MHz. Observations at the lower frequencies were made at the Giant Metre-Wave Telescope in India and those at higher frequencies at the Parkes Telescope in Australia. We present profiles from 34 of the sample with the best signal-to-noise ratio and the least scattering. The general 'rules' of pulsar profiles are seen in the data; profiles get narrower, the polarization fraction declines and outer components become more prominent as the frequency increases. Many counterexamples to these rules are also observed, and pulsars with complex profiles are especially prone to rule breaking. We hypothesize that the location of pulsar emission within the magnetosphere evolves with time as the pulsar spins down. In highly energetic pulsars, the emission comes from a confined range of high altitudes, in the middle range of spin down energies the emission occurs over a wide range of altitudes whereas in pulsars with low spin-down energies it is confined to low down in the magnetosphere.

Item Type:Article
Source:Copyright of this article belongs to Royal Astronomical Society.
Keywords:Pulsars: General
ID Code:11272
Deposited On:09 Nov 2010 03:41
Last Modified:16 May 2016 20:44

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