HEASARC Staff Scientist Position - Applications are now being accepted for a Staff Scientist with significant experience and interest in the technical aspects of astrophysics research, to work in the High Energy Astrophysics Science Archive Research Center (HEASARC) at NASA Goddard Space Flight Center (GSFC) in Greenbelt, MD. Refer to the AAS Job register for full details.

ROSAT Guest Observer Facility

Does the background vary?

(2/28/94)


Yes, the same components are found in the HRI background as in the PSPC background, but at different rates. All except the particle background originate externally to the satellite as X-rays, so the count rates are only different by the relative effective areas of the two instruments. The particle background is relatively higher for the HRI than for the PSPC and is in general the dominant background component providing count rates comparable to the cosmic background.

    - Internal 1.5(1.0-2.0) ct/sec
    - External 3.0 (1.0-10.0) ct/sec
    - XRB 1.0(0.5-2.0) ct/sec
    - Total 5.5 (2.5-14) ct/sec
               0.78  ct/sec/cm^2
               3.8E-3 ct/sec/arcmin^(-2)
               1.1E-6 ct/sec/arcsec^(-2)

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This file was last modified on Friday, 27-Jul-2001 14:57:43 EDT

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