AbstractX-ray telescopes have been providing high sensitivity X-ray observations in numerous missions. For X-ray telescopes in the future, one of the key technologies is to expand the energy band beyond 10 keV. We designed depth-graded multilayer, so-called supermirrors, for a hard X-ray telescope in the energy band up to 40 keV using lightweight thin-foil optics. They were successfully flown in a balloon flight and obtained a hard X-ray image of Cyg X-1 in the 20–40 keV band. Now supermirrors are promising to realize a hard X-ray telescope. We have estimated the performance of a hard X-ray telescope using a platinum–carbon supermirror for future satellite missions, such as NeXT (Japan) and XEUS (Europe). According to calculations, they will have a significant effective area up to 80 keV, and their effective areas will be more than 280 cm2 even at 60 keV. Limiting sensitivity will be down to 1.7×10−13 ergcm−2s−1 in the 10–80 keV band at a 100 ks observation. In this paper, we present the results of the balloon experiment with the first supermirror flown and projected effective areas of hard X-ray telescopes and action items for future missions.


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    Title :

    Hard X-ray focusing optics up to 80 keV for the future missions


    Contributors:
    Okajima, T. (author) / Tawara, Y. (author) / Ogasaka, Y. (author) / Tamura, K. (author) / Furuzawa, A. (author) / Yamashita, K. (author) / Kunieda, H. (author)

    Published in:

    Advances in Space Research ; 34 , 12 ; 2682-2687


    Publication date :

    2003-03-21


    Size :

    6 pages




    Type of media :

    Article (Journal)


    Type of material :

    Electronic Resource


    Language :

    English




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