Flare observations of Circinus X-1 at 2-cm wavelength
Open Access
- 1 November 1978
- journal article
- Published by Oxford University Press (OUP) in Monthly Notices of the Royal Astronomical Society
- Vol. 185 (1) , 29P-32P
- https://doi.org/10.1093/mnras/185.1.29p
Abstract
We report observations at 2.1 cm (14.4 GHz) of a radio flare with at least three peaks from Cir X-1 on 1978 April 24–26. Peaks (∼ 300 mJy max) were separated by ∼ 23 hr. Onset of the first peak occurred a few minutes after predicted X-ray phase zero (i.e. the time of rapid transition from high to low X-ray flux), in contrast to the delay of ∼ 7 to 8 hr observed for an earlier flare. A previous flare onset is used to determine a 2-cm flare period P = 16d.590 ± 0d.002, averaged over 25 cycles of the source, consistent with the most accurate X-ray period of 16d.594 ± 0d.003.Keywords
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