ROSAT Guest Observer Facility

The ROSAT X-Ray Mirror Assembly

ROSAT X-ray telescope

The X-ray Mirror Assembly (XMA) with its 2.40 m focal-length mirror assembly consists of 4 nested Wolter-I mirrors. The focal plane instrumentation consists of a carousel on which there are 2 Position Sensitive Proportional Counters (PSPCs), each with a filter wheel carrying a boron filter, and a High Resolution Imager (HRI).

The XMA consists of 4 nested grazing incidence Wolter-I mirrors with a maximum aperture of 83.5 cm and a focal length of 240 cm. All of the 8 mirror shells (4 paraboloid/hyperboloid pairs) are constructed of zerodur, a glass ceramic with an almost negligible thermal coefficient, these are coated with a thin layer of gold to enhance the X-ray reflectivity. Typical grazing angles are between 1 and 2 degrees, depending upon the sub-shell considered.

For more detailed information see the XRT chapter of the ROSAT Users Handbook.

Curator: Michael Arida (ADNET);
HEASARC Guest Observer Facility

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

This file was last modified on Friday, 22-Jun-2001 15:00:37 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.