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A&A 480, 623-628 (2008)
DOI: 10.1051/0004-6361:20066806
Observations of pulsars at 9 millimetres
O. Löhmer1, A. Jessner1, M. Kramer2, R. Wielebinski1, and O. Maron3, 11 Max-Planck-Institut für Radioastronomie, Auf dem Hügel 69, 53121 Bonn, Germany
e-mail: jessner@mpifr-bonn.mpg.de
2 University of Manchester, Jodrell Bank Centre for Astrophysics, Manchester M13 9PL, UK
3 J. Kepler Institute of Astronomy, University of Zielona Gora, Poland
(Received 24 November 2006 / Accepted 11 December 2007)
Abstract
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