Radio observations at 21 CM wavelength in the direction of Geminga

Details Radio observations at 21 CM wavelength in the direction of Geminga Radio observations at 21 CM wavelength in the direction of Geminga

Jun 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984a%26a...135..135s&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 135, no. 1, June 1984, p. 135-140.

Astronomy and Astrophysics

Astronomy

24

Centimeter Waves, Gamma Ray Astronomy, Periodic Variations, Position (Location), Quasars, Radiant Flux Density, Radio Spectra, Sky Surveys (Astronomy)

Scientific paper

The error region of the high-energy gamma-ray source Geminga has been searched for a radio counterpart at a wavelength of 21 cm (1412.0 MHz) using the Westerbork Synthesis Radio Telescope. The observations were carried out over three years to monitor source variability. Fifteen sources in this error region with fluxes between 4 and 50 mJy have been detected. Three sources, one of them a quasar, are found to be significantly variable. The quasar and another source exhibit a flat radio spectrum. For only two other radio sources in this sample (beside the quasar) a candidate optical counterpart could be found on the Palomar Observatory Sky Survey plates. Although these results have indicated several likely candidates for radio counterpart of Geminga, none of these appear to have highly anomalous properties at radio wavelengths.

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