Astronomy and Astrophysics – Astronomy
Scientific paper
May 1987
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987mnras.226..383l&link_type=abstract
Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 226, May 15, 1987, p. 383-394. Research supported by th
Astronomy and Astrophysics
Astronomy
24
Periodic Variations, Stable Oscillations, X Ray Sources, Galactic Radiation, Power Spectra
Scientific paper
GX 3+1, one of the brightest X-ray sources, was observed with EXOSAT in 1985 for 8.5 hr on March 24 - 25, and for 16 hr on September 4. During both observations the flux levels varied by about 20 per cent. The mean flux in September was about 8 per cent lower than in March. Throughout the March 24 - 25 observations, low-frequency noise (LFN) was observed below roughly 10 Hz, but no quasi-periodic oscillations (QPO) were detected. During the September 4 observations, LFN was again detected throughout, but this time QPO were also detected (with a mean frequency of about 8 Hz) during an approximately 3.3-hr period. QPO were only observed (but not always) when the spectral hardness was below a certain value. QPO were not observed in the so-called 'horizontal spectral branch'. It is possible that these QPO in GX 3+1 are similar in nature to the intensity-dependent 5.6-Hz QPO observed in Cyg X-2 which are also not observed in the horizontal branch.
Basinska Ewa M.
Hasinger Guenter
Jansen Fabian
Langmeier Andreas
Lewin Walter H. G.
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