Abstract
The European Photon Imaging Camera (EPIC), which will fly onboard the ESA X-ray Multi Mirror (XMM) satellite, is an X-ray imaging and spectroscopy instrument based on CCD technology. The detectors placed in the three focal plane cameras will provide images and spectra in the energy band from 0.1 to ∼ 10 keV. In order to observe sources within a wide range of intensities, several read-out modes have been planned for the detectors. Each of these modes works well up to some value of the intensity of the source, above which pile-up, i.e. the interaction of more than one photon with the same pixel or two adjacent pixels, in a single frame, becomes relevant.
After a brief description of the read-out modes, the simulations performed to establish a quantitative criterion for the limiting rates are presented. The results are discussed and compared with those reported by Chiappetti (1994a). Finally, some comments are made on the impact of these results on the scientific objectives of the mission.
Similar content being viewed by others
References
Bignami G.F. et al.: 1989, ‘EPIC: European (X-ray) Photon Imaging Camera’, proposal submitted to ESA for the XMM cornerstone mission,
Chiappetti L. et al.: 1993, ‘EPIC Operating Modes’, EPIC project, report of the Operating Mode Working Group, EPIC-IFC-TN-001
Chiappetti L.: 1994a, ‘A re-assessment of EPIC telemetry rates’, EPIC project technical note, EPIC-IFC-TN-005
Chiappetti L.: 1994b, ‘EPOS: EPic Observation Simulations’, EPIC project technical note EPIC-IFC-TN-006
LumbD.H., BerthiaumeG.D., BurrowsD.N., GarmireG.P., NousekJ.A.: 1991, Exp. Astr. 2, 179
PiccinottiG. et al.: 1982, ApJ 253, 485
Pigot C.: 1993, ‘Some comments on operating modes’, ,private comunication
SarraP.F., BignamiG.F.: 1993, Exp. Astr. 2, 357
SchwartzD.A.: 1979, ‘X-Ray Astronomy’ in Proceedings of the 21th Plenary Meeting of the Committee on Space Research, ed(s)., W.A. Baity and L.E. Peterson, N.Y.: Pergamon, pag. 453
Strüder L.: 1994, ‘Semiconductor-X-Ray detectors’ in Proceedings of the 4th Course of the International School of Space Science, ed(s)., S. Massaglia, L'Aquila, in press
Turner M.: 1994, ‘CCDs in X-Ray Spectroscopy: promise and realisation’ in Proceedings of the 4th Course of the International School of Space Science, ed(s)., S. Massaglia, L'Aquila, in press
WarwickR.S. and PyeJ.P.: 1978, MNRAS 183, 169
Author information
Authors and Affiliations
Rights and permissions
About this article
Cite this article
Musso, C., Chiappetti, L. & Bignami, G.F. Optimizing mission science: The read-out modes of the EPIC for X-ray astronomy. Experimental Astronomy 6, 235–248 (1995). https://doi.org/10.1007/BF00418322
Received:
Accepted:
Issue Date:
DOI: https://doi.org/10.1007/BF00418322