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Astron. Astrophys. 339, 787-790 (1998)

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Upper limits on the pulsed radio emission from the Geminga pulsar at 35 & 327 MHz

R. Ramachandran 1, 2, A.A. Deshpande 1 and C. Indrani 1

1 Raman Research Institute, C.V. Raman Avenue, 560080 Bangalore, India (desh@rri.ernet.in, indrani@rri.ernet.in)
2 Astronomical Institute, "Anton Pannekoek", University of Amsterdam, Kruislaan 403, 1098 SJ Amsterdam, The Netherlands (ramach@astro.uva.nl)

Received 7 July 1998 / Accepted 4 September 1998

Abstract

We report here our observations at 35 MHz and 327 MHz made in the direction of the [FORMULA]-Ray pulsar Geminga. Based on the observed absence of any significant pulsed emission from this source above our detection thresholds at the two frequencies, we obtain useful upper-limits for the average flux to be 75-100 mJy at 35 MHz, and 0.2-0.3 mJy at 327 MHz. We discuss a few possible reasons for the "radio-quiet" nature of this pulsar at frequencies other than around 100 MHz.

Key words: pulsars: individual: J0633+1746

Send offprint requests to: R. Ramachandran

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© European Southern Observatory (ESO) 1998

Online publication: October 22, 1998
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