The phase-delay spectrum of GX 5-1 on its normal branch

Details The phase-delay spectrum of GX 5-1 on its normal branch The phase-delay spectrum of GX 5-1 on its normal branch

Mar 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999a%26a...343..197v&link_type=abstract

Astronomy and Astrophysics, v.343, p.197-201 (1999)

Astronomy and Astrophysics

Astrophysics

14

Accretion, Accretion Disks, Stars: Individual: Gx 5-1, Stars: Neutron, X-Rays: Stars

Scientific paper

We have measured the phase differences between X-ray intensity variations in different energy bands in data taken with Ginga of the Z source GX 5-1 in its normal branch. We apply a chi (2) optimal extraction technique to measure the phase-delay spectrum of the normal-branch quasi-periodic oscillations (QPO) and find a jump at 3.5 keV. X-ray intensity variations at the QPO frequency in energy channels below 3.5 keV are in phase with one another. The same is true of energy channels above 6 keV. However, intensity variations in energy channels above 6 keV lag those in channels below 3.5 keV by ~ 150(deg) . We see no minimum in the fractional rms amplitude of the quasi-periodic oscillations at the jump energy, in contrast to what is seen in the Z source Cyg X-2, but because of limited statistics we cannot rule out such a minimum. We discuss our findings in the context of a radiation-hydrodynamics model for the normal-branch quasi-periodic oscillations.

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