Volume 480, Number 3, March IV 2008
|Page(s)||623 - 628|
|Published online||17 January 2008|
Observations of pulsars at 9 millimetres
Max-Planck-Institut für Radioastronomie, Auf dem Hügel 69, 53121 Bonn, Germany e-mail: firstname.lastname@example.org
2 University of Manchester, Jodrell Bank Centre for Astrophysics, Manchester M13 9PL, UK
3 J. Kepler Institute of Astronomy, University of Zielona Gora, Poland
Accepted: 11 December 2007
Aims.The behaviour of the pulsar spectrum at high radio frequencies can provide decisive information about the nature of the radio emission mechanism.
Methods.We report recent observations of a selected sample of pulsars at mm (32 GHz) with the 100-m Effelsberg radio telescope.
Results.Three pulsars, PSR B0144+59, PSR B0823+26, and PSR B2022+50, were detected for the first time at this frequency. We confirm the earlier flux density measurements for a sample of six pulsars, and we are able to place upper flux density limits for another 12 pulsars. We find that all pulsar spectra have a simple form that can be described using only three parameters, one of which is the lifetime of short nano-pulses in the emission region. The study of the transition region from coherent to incoherent emission needs further and more sensitive observations at even higher radio frequencies.
Key words: stars: pulsars: individual: PSR B0144+59 / stars: pulsars: individual: PSR B0823+26 / stars: pulsars: individual: / PSR B2022+50 / radiation mechanisms: non-thermal / radio continuum: stars
© ESO, 2008
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