Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 2000
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000head....5.4412f&link_type=abstract
American Astronomical Society, HEAD Meeting #5, #44.12; Bulletin of the American Astronomical Society, Vol. 32, p.1652
Astronomy and Astrophysics
Astronomy
Scientific paper
Among the ~ 20 isolated neutron stars that emit in more than one energy band only Geminga was supposed to be radio-quiet. Very recently three groups at the Puschchino Radio Astronomy Observatory reported independently the detection of a weak pulsed radio emission from this source at 100 MHz, bringing Geminga back into the standard group of radio-loud, isolated neutron stars. Here we report a series of observations of Geminga performed with the Arecibo radio telescope at various frequencies between 318 and 1400 MHz, performed from 1982 to 1984. No pulsed emission was detected. The high sensitivity of the Arecibo telescope allowed us to put a stringent upper limit to the spectral index in the radio band: α <= -3.6. If the 100 MHz pulsed emission will be confirmed, Geminga will retain its peculiar nature of a radio pulsar with an extremely steep radio spectrum. This would severely constrain the models for the radio emission from isolated rotating neutron stars.
Burderi Luciano
Fauci Francesco
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