Detection of Radio Emission from Scorpio X-1

Details Detection of Radio Emission from Scorpio X-1 Detection of Radio Emission from Scorpio X-1

Jun 1968

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1968natur.218..855a&link_type=abstract

Nature, Volume 218, Issue 5144, pp. 855-856 (1968).

Physics

32

Scientific paper

SOME twenty X-ray sources are now known, among them the well known objects M87 and the Crab nebula. Two X-ray sources (Sco X-1 and Cyg X-2) have been optically identified with previously unknown objects which have a stellar appearance and the characteristics of old novae1,2. Most X-ray sources remain unidentified, however. Most of them lie at low galactic latitudes, and it seems possible that many are objects similar to Sco X-1. These objects are not prominent at radio wavelengths and previous attempts to detect radio emission from Sco X-1, the strongest X-ray source, have yielded only upper limits to its flux density (refs. 3-5 and Hogg and Johnson quoted in ref. 6). The flux density of Sco X-1 has now been measured as 0.021 +/- 0.007 flux units (1 flux unit = 10-26 W m-2 Hz-1) at a wavelength of 4.6 cm. This value is substantially below the previously determined upper limits.

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