منابع مشابه
Rxte Observation of Cygnus X-1: Ii. Timing Analysis,
We present timing analysis for a Rossi X-ray Timing Explorer observation of Cygnus X-1 in its hard/low state. This was the first RXTE observation of Cyg X-1 taken after it transited back to this state from its soft/high state. RXTE’s large effective area, superior timing capabilities, and ability to obtain long, uninterrupted observations have allowed us to obtain measurements of the power spec...
متن کاملTime Domain Analysis of Variability in Cygnus X-1: Constraints on the Emission Models
We use time domain analysis techniques to investigate the rapid variability of Cygnus X-1. We show that the cross-correlation functions between hard and soft energy bands reach values very close to unity and peak at a lag of less than 2 millisecond for energies separated by a factor of 10. This confirms that the process that produces X-ray photons at different energies is extremely coherent on ...
متن کاملRossi X-ray Timing Explorer Observation of Cygnus X-1 in Its High State
We present the results from the Rossi X-Ray Timing Explorer observations of Cygnus X-1 in its high state. In the energy range of 2–200 keV, the observed X-ray spectrum can be described by a model consisting of a soft blackbody component and a broken power law with a high-energy cutoff. The low-energy spectrum (below 111 keV) varies significantly from observation to observation while the high-en...
متن کاملReflection and noise in Cygnus X – 1
We analyzed RXTE/PCA observations of Cyg X–1 from 1996–1998. We found a tight correlation between the characteristic noise frequencies (e.g. the break frequency ν br) and the spectral parameters in the low spectral state. The amplitude of reflection increases and the spectrum of primary radiation steepens as the noise frequency increases (ν br changes by a factor of ∼ 15 in our sample). This ca...
متن کاملRecurrent microblazar activity in Cygnus X-1?
Recurrent flaring events at Xand soft gamma-ray energies have been recently reported for the galactic black hole candidate Cygnus X-1. The observed fluxes during these transient outbursts are far higher than what is observed in “normal” episodes. Here we suggest that the origin of this radiation is non-thermal and produced by inverse Compton interactions between relativistic electrons in the je...
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ژورنال
عنوان ژورنال: Chinese Journal of Astronomy and Astrophysics
سال: 2001
ISSN: 1009-9271
DOI: 10.1088/1009-9271/1/4/313