Spectral and Timing evolution of GX 340+0 along its Z-track
arxiv(2024)
摘要
We present the results from spectral and timing study of the Z source GX
340+0 using AstroSat's SXT and LAXPC data. During the observation the source
traced out the complete Z-track, allowing for the spectral evolution study of
the Horizontal, Normal and Flaring branches (HB, NB and FB) as well as the hard
and soft apexes (HA and SA). The spectra are better and more physically
described by a blackbody component and a hot Comptonizing corona with a varying
covering fraction, rather than one having a disc component. Along the track,
the Comptonized flux (as well as the covering fraction) monotonically
decreases. It is the blackbody component (both the temperature and radius)
which varies non-monotonically and hence gives rise to the Z-track behaviour.
Rapid timing study reveals a prominent Quasi-periodic Oscillation (QPO) at 50
Hz at the HB, HA and upper NB, while a QPO at 6 Hz is seen for the other
branches. The fractional r.m.s of the QPOs increase with energy and exhibit
soft lags in all branches except SA and FB.
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