X-ray variability patterns and radio/X-ray correlations in Cyg X-1
نویسندگان
چکیده
منابع مشابه
Long Term Variability of Cyg X - 1 ⋆ I . X - ray spectral - temporal correlations in the hard state
We present the long term evolution of the timing properties of the black hole candidate Cygnus X-1 in the 0.002– 128 Hz frequency range as monitored from 1998 to 2001 with the Rossi X-ray Timing Explorer (RXTE). For most of this period the source was in its hard state. The power spectral density (PSD) is well modeled as the sum of four Lorentzians, which describe distinct broad noise components...
متن کاملThe first simultaneous X-ray/γ-ray observations of Cyg X-1 by Ginga and OSSE
We present the results of 4 simultaneous observations of Cygnus X-1 by Ginga and OSSE. The X-ray/γray spectra can be described by an intrinsic continuum and a component due to Compton reflection including an iron Kα line. The intrinsic spectrum at X-ray energies is a power-law with a photon spectral index of Γ = 1.6. The intrinsic γ-ray spectrum can be phenomenologically described by either a p...
متن کاملCorrelations between X-ray Spectral and Timing Characteristics in Cyg X-2
Correlations between the quasi-periodic oscillations (QPOs) and the spectral power-law index have been reported for a number of black hole candidate sources and for four neutron star (NS) sources, 4U 0614+09, 4U 1608-52, 4U 1728-34 and Sco X-1. An examination of QPO frequencies and index relationship in Cyg X-2 is reported herein. The RXTE spectrum of Cyg X-2 can be adequately represented by a ...
متن کاملA Combined Model for the X-ray to Γ-ray Emission of Cyg X-1
We use recent data obtained by three (OSSE, BATSE, and COMPTEL) of four instruments on board the Compton Gamma Ray Observatory, to construct a model of Cyg X-1 which describes its emission in a broad energy range from soft X-rays to MeV γ-rays self-consistently. The γ-ray emission is interpreted to be the result of Comptonization, bremsstrahlung, and positron annihilation in a hot optically thi...
متن کاملCorrelated X-ray and Optical Variability in X-ray Binaries
It has long been known that X-ray and optical/UV variability in active X-ray binaries is sometimes correlated. The expectation has been that this arises from rapid reprocessing of X-rays into longer wavelength photons, and hence that the lags between the bandpasses can be used to reconstruct an echomap of the binary, revealing the geometry and spatial scale of reprocessing sites. I will review ...
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ژورنال
عنوان ژورنال: Monthly Notices of the Royal Astronomical Society
سال: 2011
ISSN: 0035-8711
DOI: 10.1111/j.1365-2966.2011.19127.x