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zeige Details Zhang, S. N., Fishman, G. J., ... Imaging high-energy astrophysical sources using Earth occultation
in: Nature . - London [u.a.] : Nature Publising Group, ISSN 1476-4687, Vol. 366, No. 6452 (1993), p. 245-247
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1993
HIGH-ENERGY astrophysical sources can be difficult to image.Photons with energies above ∼5 keV are hard to focus, so experimentsusually employ coded masks1–4 or movingcollimators5–9 to modulate the flux received by thedetectors; the resulting signals are then deconvolved to form the images. Herewe demonstrate a new approach which makes use of the large-area, non-collimateddetectors of the Burst and Transient Source Experiment on the Compton Gamma-RayObservatory. As the spacecraft moves in its orbit, the Earth itself acts as astable occulting disk. Changes in the measured signal during a singleoccultation correspond to the integrated intensity of sources positioned alongthe arc described by the Earth's edge (limb). The low-altitude, moderatelyinclined orbit of the spacecraft ensures that the angle at which the limbtraverses a source region varies between occultations, and thus data from aseries of occultations can be transformed into an image. This imaging processis conceptually and mathematically similar to those used in fan-beamaperture-synthesis radio-astronomy10 and medicalcomputer-assisted tomography11, and holds great promise forall-sky imaging with relatively simple (and hence inexpensive) detectors.
beteiligte Personen: Zhang, S. N. , Fishman, G. J. , Harmon, B. A. , Paciesas, W. S.
Format: Elektronisch
Erschienen: 1993.
Serie: Nature Archives 1869 - 2007 [Dig. Serial]
Schlagwörter:
URL: http://dx.doi.org/10.1038/366245a0

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