EXCALIBur - absolute calibration of the X-ray spectrum of the Crab nebula

Details EXCALIBur - absolute calibration of the X-ray spectrum of the Crab nebula EXCALIBur - absolute calibration of the X-ray spectrum of the Crab nebula

May 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994a%26a...285..705n&link_type=abstract

Astronomy and Astrophysics 285, 705-709 (1994)

Astronomy and Astrophysics

Astrophysics

4

Instruments, X-Ray: General

Scientific paper

The next generation of X-ray telescopes (XSPECT/SODART on SPECTRUM-X-{GAMMA}, AXAF and XMM) will measure the broad band X-ray spectrum of thousands of sources with a photon noise of 1 percent or better. At present, the spectrum of the traditional standard X-ray source, the Crab Nebula, is known only to an accuracy of 10 percent above 2 keV and to about 50 percent below. Therefore, to meet the requirements for the absolute calibration of these X-ray telescopes, a special dedicated calibration mission must be carried out. We suggest an instrument consisting of two pinhole cameras (one with a CCD detector, and the other with an imaging proportional counter with an active area of 20 cm^2^). We show that this instrument will provide the spectrum of the Crab Nebula with an accuracy better than 2 per cent over the energy range 0.8 - 20 keV, with an energy resolution of 60 eV at 1 keV and 1 keV at 10 keV.

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