Upper Limits on the Continuum Emission from Geminga at 74 and 326 MHz
NAVAL RESEARCH LAB WASHINGTON DC REMOTE SENSING DIV
Pagination or Media Count:
We report a search for radio continuum emission from the gamma-ray pulsar Geminga. We have used the VLA to image the location of the optical counterpart of Geminga at 74 and 326 MHz. We detect no radio counterpart. We derive upper limits to the pulse-averaged flux density of Geminga, taking diffractive scintillation into account. We find that diffractive scintillation is probably quenched at 74 MHz and does not influence our upper limit, S56 mJy 2 sigma, but that a 95 confidence level at 326 MHz is S5 mJy. Owing to uncertainties on the other low-frequency detections and the possibility of intrinsic variability or extrinsic variability refractive interstellar scintillation or both, our nondetections are nominally consistent with these previous detections.