Astronomy Letters, News-97


Our journal got the second MAIK/NAUKA award
for the best publication in 1997 !!!


MAIK/NAUKA commended by this award a paper by A.D.Kuz'min, and B.Ya.Losovskii "Discovery of the radiopulsar PSR J0633+1746 in Geminga", Pis'ma v Astronomicheskii Zhurnal, 1997, v.23, p.323 (Astronomy Letters, 1997, v.23, p.283).

Geminga, the second brightest (with energies greater than 100 MeV) gamma-ray source on the sky, does not emit in hard X-ray (1 keV < E < 1 MeV), optical (a 25m star) and radio (millimeter wavelengths) bands. During long time it was the most peculiar and mysterious source in the Galaxy. Its nature was understood in 1992, when the satellite ROSAT detected soft (E < 1 keV) X-ray emission from this object pulsating with a period of 0.237 s. Soon after this discovery, pulsations with the same period were detected in the gamma-ray band. It became obvious that we observe a pulsar - a rapidly spinning neutron star - similar to the Crab pulsar. However if the pulsar in Crab is the powerful radio source with a steep emission spectrum, all attempts to detect radio emission from Geminga have failed.

Authors of this paper discovered pulsating emission from Geminga (with a period of 0.237 s) at meter wavelengths. This was result of long (1992-1996) observations of the source with the Large Phased Array of the Lebedev Physical Institute. The radio flux density was found to be 0.1 Jy at 102 MHz, its spectral index exceeded 1.7. The emission measure was estimated to be 3 pc cm-3. Discovery of the radio pulsations from Geminga was met in the world with great interest. Several scientific groups began research in this band and have already confirmed the result of our authors.

Annual competitions for the best publication are held by MAIK/NAUKA since 1995 and involve more than 80 scientific journals. There are 5 first (main) and 50 second (small) awards. line
March 23, 1998