ROSAT Guest Observer Facility

Cluster RXJ0916+1736

ROSAT image RXJ09

Image credit: Max-Planck-Institut für extraterrestrische Physik (MPE)

Large clusters of galaxies containing thousands of galaxies were discovered by ROSAT as prominent X-ray sources. In addition to this, very small groups of galaxies were found as X-ray sources in the ROSAT sky map like the group shown here. It was discovered by Ramella, Geller, and Huchra in the CfA galaxy survey and has a distance of about 500 million light years. The picture is an optical sky photography superimposed with brightness contours of X-rays. Both of the bright eliptical galaxies are seen clearly in the centre of the group.

Curator: Michael Arida (SP Sys);
HEASARC Guest Observer Facility

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

This file was last modified on Thursday, 04-Oct-2007 12:10:10 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: Phil Newman

    Privacy Policy and Important Notices.