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EXOSAT observation of the QSO galaxy pair 1E0104.2+3153
Giommi, P.; Maccacaro, T.; Gioia, I. M.
A very long (160,000 second) observation of the X-ray source 1E0104.2+3153 was carried out using the Channel Multiplier Array (CMA) instrument on board Exosat in August 17, 1984. A thin Lexan filter having maximum throughput in the 0.05-2.0 keV CMA band was used during the entire observation period. The positional accuracy of the CMA was sufficien…
X-ray and optical variability at the hour timescale for 1E 0630+178 (GEMINGA) and its proposed optical couterpart
Caraveo, P. A.; Bignami, G. F.; Vigroux, L. +3 more
Einstein and EXOSAT data on the soft X-ray source IE 0630+178, the proposed counterpart of the γ-ray source GEMINGA, are analyzed for variability on the time scale of one to three hours. The EXOSAT September 1983 data, with an uninterrupted strech of over 10 hours offer the most interesting case. In parallel, a similar analysis is presented for th…
EXOSAT observations of active stellar coronae in the Cygnus Loop, T Tau & NGC 2264 regions
Mukai, K.; Charles, P. A.; Kahn, S. M. +4 more
A highly variable point X-ray source, first seen by the Einstein IPC, has been positioned with the EXOSAT CMA and identified with a bright (V = 8.5) K0 star. Although in the direction of the southern half of the Cygnus Loop, this star is almost certainly a foreground object and typical of other active cool stars that are related to RS CVn systems.…
X-ray astronomy in the EXOSAT ERA
Peacock, A.
Among topics discussed are: X-ray observations of stellar coronae and isolated white dwarfs; cataclysmic variables; and low/mass and high/mass X-ray binary sources. Consideration is also given to: supernova remnants and X-ray emission in the interstellar medium; active galactic nuclei; galaxy clusters; and X-ray scattering by intergalactic dust. A…
X-Ray Spectrum of the TYCHO SNR Observed with EXOSAT
Robba, N. R.; Taylor, B. G.; Morini, M. +2 more
The Gas Scintillation and Medium Energy instruments onboard EXOSAT measured the continuum and line emission spectrum in the Tycho supernova remnant. For the first time the iron line at 6.53 keV is clearly resolved from the continuum, in addition to the lines from S, Ar and Ca. The comparison with a non-equilibrium ionisation model (Hamilton et al …
EXOSAT results on the X-ray burster 2S 1254-690.
Parmar, A. N.; Courvoisier, T. J. -L.; Peacock, T.
Exosat observations of 2S1254-690 in August 1984 have confirmed the presence of periodic dips in the X-ray intensity. These dips occurred with a period of 3.9 hours and lasted for about 50 minutes. During individual dips, the observed X-ray flux oscillated several times between the quiescent level and an undetectable level on time scales varying f…