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Astron. Astrophys. 322, L17-L20 (1997)

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Letter to the Editor

Pulsar detection at 87 GHz

D. Morris 1, M. Kramer 2, C. Thum 1, R. Wielebinski 2, M.Grewing 1, J.Peñalver 3, A.Jessner 2, G. Butin 3 and W. Brunswig 3

1 Institut de Radioastronomie Millimetrique, 300 Rue de la Piscine, F-38406, St.Martin d'Heres, France
2 Max Planck Institut für Radioastronomie, Auf dem Hügel 69, D-53121, Bonn, Germany
3 Instituto de Radioastronomía Millimétrica, Avenida Divina Pastora 7, E-18012, Granada, Spain

Received 21 February 1997 / Accepted 21 March 1997


Pulsed radio emission at 87 GHz has been detected from the pulsar PSR B0355+54. The observed flux density of [FORMULA] mJy is, within the measurement errors, the same as measured previously at 43 GHz and is thus higher than expected. However the errors are such that all the measurements at frequencies higher than 1.2 GHz are just consistent with a single power law spectrum.

A second pulsar, PSR B2021+51, with a reported excess of flux density at 43 GHz, has been observed but not detected. The resulting upper limit for the flux density provides little constraint on the form of its spectrum above 43 GHz.

Key words: Pulsars: general – Pulsars: individual: B0355+54, B2021+51 – Radiation mechanisms: miscellaneous

Send offprint requests to: D. Morris

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© European Southern Observatory (ESO) 1997

Online publication: June 5, 1998