Intensity-dependent quasi-periodic oscillations in the X-ray flux of GX5-1 (original) (raw)
NASA/ADS
;
- Jansen, F. ;
- van Paradijs, J. ;
- Lewin, W. H. G. ;
- van den Heuvel, E. P. J. ;
- Trumper, J. E. ;
- Szatjno, M.
Abstract
The X-ray flux of the bright galactic bulge source GX5-1 shows intensity-dependent quasi-periodic oscillations between ~20 and ~40 Hz, appearing as a broad peak in the power spectrum whose centroid frequency, width and integrated excess power strongly depend on the source intensity. The strength and steepness of low-frequency noise present in the power spectra below 15 Hz also depend on the source intensity. No evidence is found for coherent X-ray pulsations between 0.5 and 2,000 Hz. We discuss possible mechanisms to explain these new phenomena.
Publication:
Nature
Pub Date:
July 1985
DOI:
Bibcode:
Keywords:
- Neutron Stars;
- Stellar Oscillations;
- X Ray Binaries;
- Dwarf Novae;
- Field Strength;
- Galactic Bulge;
- Power Spectra;
- Stellar Magnetic Fields;
- Temporal Distribution;
- Astrophysics