ROSAT Guest Observer Facility

Why is there an instrument map over channels 42 to 201, but not one over channels 20 to 201? Why are there no maps for channels above 201?

(3/15/94)


The answer to the first question is that Steve originally constructed the instrument maps for his own use. He chose channel ranges that were convenient for the problems that he wished to address. Later, he realized that these maps, and the program using these instrument maps to generate exposure maps, might be of general interest.

The answer to the second question is that there are very few counts above channel 201, and these are dominated by the particle background. An instrument map above channel 201 would be of a statistical quality too low to be useful.


button Select another question related to this topic

Select another FAQ topic Select another FAQ topic Return to the ROSAT GOF Return to the ROSAT GOF



Please use the Feedback link if you have questions on ROSAT.

This file was last modified on Friday, 27-Jul-2001 14:57:44 EDT

NASA Astrophysics

  • FAQ/Comments/Feedback
  • Education Resources
  • Download Adobe Acrobat
  • A service of the Astrophysics Science Division (ASD) at NASA/ GSFC

    ROSAT Project Scientist: Dr. Robert Petre

    Responsible NASA Official: Dr. Andy Ptak

    Privacy Policy and Important Notices.