Abstract
The first preliminary results from the Ariel-5 All-Sky X-Ray Monitor are presented, along with sufficient experiment details to define the experiment sensitivity. Periodic modulation of the X-ray emission is investigated from three sources with which specific periods have been associated, with the results that the 4.8 h variation from Cyg X-3 is confirmed, a long-term average 5.6 day variation from Cyg X-1 is discovered, and no detectable 0.787 day modulation of Sco X-1 is observed. Consistency of the long-term Sco X-1 emission with a ‘shot-noise’ model is discussed, wherein the source behavior is shown to be interpretable as ∼ 100 ‘flares’ per day, each with a duration of several hours. A sudden increase in the Cyg X-1 intensity by almost a factor of three on 22 April, 1975 is reported, after 5 months of relative source constancy. The light curve of a bright nova-like transient source in Triangulum is presented, and compared with previously observed transient sources. Preliminary evidence for the existence of X-ray ‘bursts’ with duration <1 h is offered, with the caveat that there is not yet any supporting evidence to guarantee that the effect is truly astronomical.
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Amnuel, P. R., Guseinov, O. H., and Rakhamimov, Sh. Ju.: 1974,Astrophys. Space Sci. 29, 331.
Boldt, E. A., Holt, S. S., Rothschild, R. E., and Serlemitsos, P. J.: 1975, in D. Venkatesan (ed.),Proceedings of International Conference on X-Rays in Space, Calgary.
Canizares, C. R., McClintock, J. E., Clark, G. W., Lewin, W. H. G., Schnopper, H. W., and Sprott, G. F.: 1973,Nature Phys. Sci. 241, 28.
Gottlieb, E. W., Wright, E. L., and Liller, W.: 1975,Astrophys. J. Letters 195, L33.
Holt, S. S., Kaluzienski, L. J., Boldt, E. A., and Serlemitsos, P. J.: 1974,IAU Circ. No. 2729.
Hutchings, J. B., Crampton, D., Glaspey, J., and Walker, G. A. H.: 1973,Astrophys. J. 182, 549.
Li, F. K. and Clark, G. W.: 1974,Astrophys. J. Letters 191, L27.
Mason, K. O., Hawkins, F. J., Sanford, P. W., Murdin, P., and Savage, A.: 1974,Astrophys. J. Letters 192, L65.
Parsignault, D. R., Gursky, H., Kellogg, E. M., Matilsky, T., Murray, S., Schreier, E., Tananbaum, H., Giacconi, R., and Brinkman, A. C.: 1972,Nature Phys. Sci. 239, 123.
Pounds, K.: 1974,IAU Circ. No. 2729.
Sanford, P. W. and Hawkins, F. H.: 1972,Nature Phys. Sci. 239, 135.
Silk, J.: 1973,Astrophys. J. 181, 747.
Tananbaum, H., Gursky, H., Kellogg, E., Giacconi, R., and Jones, C.: 1972,Astrophys. J. Letters 177, L15.
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Holt, S.S. Temporal X-ray astronomy with a pinhole camera. Astrophys Space Sci 42, 123–141 (1976). https://doi.org/10.1007/BF00645534
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DOI: https://doi.org/10.1007/BF00645534