منابع مشابه
X-ray Observations of Grs 1915+105
1. Spectral analysis of simultaneous ROSAT/BATSE data After the discovery of GRS 1915+105 (Castro-Tirado et al. 1992) we obtained pointed ROSAT observations every six months (12 until now). The flux in the ROSAT (0.1–2.4 keV) band is strikingly different from the simultaneous BATSE (25–50 keV) flux which was obtained by integrating the best fit power law (Fig. 1). Motivated by the different int...
متن کاملIdentification of a 12 – 17 day timescale in X - ray observations of GRS 1915 + 105
Measurement of the energy emitted from accreting astrophysical systems provides an observational constraint on the plasma processes that may be operating within the disk. Here we examine the continual time variation over the past six years of the total X-ray flux from the microquasar GRS 1915+105. The application of differencing and rescaling techniques to RXTE/ASM data shows that the small amp...
متن کاملLong - Term Variability of the Hard X - ray Source GRS 1758 – 258 : GRANAT / SIGMA Observations
The results of GRANAT/SIGMA hard X-ray observations of GRS 1758–258 in 1990–1998 are presented. The source lies at ∼ 5 from the Galactic Center and was within the SIGMA field of view during the GRANAT surveys of this region. The total exposure time of the Galactic Center was 11×10 s. The regular SIGMA observations revealed strong variability of the source: the 40–150 keV flux varied at least by...
متن کاملRxte Observations of a New X-ray Transient: Grs 1737-31
We present the results from RXTE observations of a new X-ray transient, GRS 1737-31, near the Galactic center during an outburst. Over a span of two weeks, the source was seen to vary significantly on time scales down to a few seconds. The rapid flares in the light curves bear resemblance to those observed for Cygnus X-1, a well-known black hole candidate (BHC). The power-density spectrum is al...
متن کاملRapid X - ray variability of the superluminal source GRS 1915
The superluminal X-ray transient source GRS 1915+105 was observed during July 20-29, 1996 with the Indian X-ray Astronomy Experiment (IXAE) on the Indian satellite IRS-P3 launched on March 21, 1996 from Shriharikota Range in India. During our observations covering the energy band 2-18 keV, we have seen strong erratic intensity variations on time scale of 0.1s 10s. Quasi Periodic Oscillations (Q...
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ژورنال
عنوان ژورنال: International Astronomical Union Colloquium
سال: 1997
ISSN: 0252-9211
DOI: 10.1017/s0252921100043566