On the X-ray fast-time variability of Sco X-2 (GX 349+2)

Details On the X-ray fast-time variability of Sco X-2 (GX 349+2) On the X-ray fast-time variability of Sco X-2 (GX 349+2)

2001-02-09

arxiv.org/abs/astro-ph/0102156v1

Astronomy and Astrophysics

Astrophysics

9 pages, 7 figues, accepted for publication in A&A

Scientific paper

10.1051/0004-6361:20010216

We have analysed archived Ginga data on the Z source Sco X-2 (GX349+2). We present the first detailed investigation of its X-ray fast-time variability, as a function of position in the Z track. During the two-day observation over the period 5-7 March 1989, the source was in the so-called flaring branch, and the lower part of the so-called normal branch. We found broad peaked noise with a centroid frequency and width of ~4-7 Hz and ~6-12 Hz respectively. The peaked noise was strongest in the lower flaring branch, with a maximum fractional rms amplitude of ~3 %. We conclude that it is not a manifestation of atoll source high frequency noise, as had been suggested, and compare it with the power spectral features seen in other Z sources. We find that the peaked noise is markedly different to the quasi-periodic oscillations found in the normal and flaring branches of Sco X-1; however it bears some resemblance to that seen in the flaring branch of Cyg X-2 at low overall intensities.

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