Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010scchg..53s..86l&link_type=abstract
Science China Physics, Mechanics and Astronomy, Volume 53, Issue 1, pp.86-90
Astronomy and Astrophysics
Astronomy
1
Accretion, Accretion Disk—Binaries: Close-Stars: Individual (Cygnus X-2)-X-Rays: Binaries
Scientific paper
We have investigated the relation between the root mean square (rms) variability and the X-ray flux (rms-flux relation) of the Z source Cyg X-2, and as well the energy dependence based on the Rossi X-ray Timing Explorer ( RXTE) observations. We currently focus on the horizontal branch (HB), due to the negative correlation in flux of the soft and the hard X-rays. The rms-flux correlation has energy dependence as follows: positive at hard X-rays (above 10 keV) but negative at soft X-rays (below 10 keV). This provides a feature different from the previous one, and may be suggestive of different origins of X-rays below and above 10 keV. Nevertheless, the overall spectrum can be well fitted with a model consisting of a blackbody and Comptonization components, but the fitting results do not reveal any features around 10 keV that could account for such a change in the rms-flux relation.
Lei Yajuan
Li Zhibing
Qu Jinlu
Song Liming
Zhang Shu
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