منابع مشابه
The Off State of GX 339 – 4
We report BeppoSAX and optical observations of the black hole candidate GX339– 4 during its X-ray ‘off’ state in 1999. The broad-band (0.8–50 keV) X-ray emission can be fitted by a single power law with spectral index, α ∼ 1.6. The observed luminosity is 6.6 × 10 erg s in the 0.5–10 keV band, which is at the higher end of the flux distribution of black hole soft X-ray transients in quiescence, ...
متن کاملMOST Radio Monitoring of GX 339 − 4
The Molonglo Observatory Synthesis Telescope (MOST) has been monitoring the candidate Galactic black hole binary system GX339−4 at 843 MHz since 1994 April. We present the results of this program up to 1997 February and show a possible correlation between radio and X-ray light curves.
متن کاملOSSE Observations of GX 339 � 4
The Oriented Scintillation Spectrometer Experiment on the Compton Gamma Ray Observatory observed the Galactic black hole candidate GX 339?4 as a target of opportunity in 1991 September, in response to the outburst reported by BATSE. We report here on energy spectra in the 50 keV to 10 MeV range obtained by OSSE. The source was detected from 50 to 400 keV at a level relative to the Crab nebula o...
متن کاملThe Distance and Interstellar Sight Line to Gx 339 – 4
The distance to the black hole binary GX 339–4 remains a topic of debate. We examine high-resolution optical spectra of the Na D lines resolving the velocity structure along the line of sight. We find this to be complex, with at least nine components, mostly blue-shifted, spanning a velocity range of nearly 200 km s −1. The presence of components with a large blue-shift rules out a nearby locat...
متن کاملReflection and noise in the low spectral state of GX 339 - 4 .
We analyzed RXTE/PCA observations of GX339-4 in the low spectral state from 1996–1997. We found tight correlations between the QPO frequency and the spectral parameters of GX 339-4 X-ray emission. With the increase of the QPO frequency the slope of the primary power law and the amplitude of the reflected component increase. Frequency resolved spectral analysis showed, that the variability of th...
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ژورنال
عنوان ژورنال: Monthly Notices of the Royal Astronomical Society
سال: 2000
ISSN: 0035-8711,1365-2966
DOI: 10.1046/j.1365-8711.2000.03334.x