LEDAS 
Leicester Database and Archive Service
 
Mission
    Description
ROSAT Guest
    Observer Centre
ROSAT Results
    Archive
ROSAT WFC Data
    Distribution Service
WFC Survey
    Image Browser
ROSAT Databases:
    Complete List
ROSAT Gallery
Related Sites
ROSAT Databases
  ROSPUBLIC
  ROSWFCPUB
  ROSMASTER
  RASSBSC
  ROSHRI
  WGACAT
  RASSIMAGES
  View ROSAT DBs
Line
Footer
e-mail
Downtime expected shortly as all LEDAS services are moved to a new server.
Cas-A

Supernova remnants, like this one in the constellation of Cassiopeia, named Cas A, are the final debris from the supernova explosions that mark the end-point of the lives of massive stars. The collision between the supernova shell, expanding outwards at a speed of around 10,000 km per second, and interstellar gas heats the gas to very high temperature. As a result in this ROSAT image we can see the 10 million-degree gas in the supernova shell glowing brightly in the X-ray band. The original supernova explosion that produced Cas A took place around 400 years ago but was not seen by astronomers according to historical records. The probable explanation for this is that the supernova explosion occurred in a relatively obscured and distant part of our Milky Way, making it much less dramatic than other supernovae in recorded history such as those associated with the Crab Nebula, or SN1006.

 
HOME
SEARCH
SERVICES INFO SOFTWARE ViZieR BLASTA DSS
ARCHIVES ASCA CHANDRA GINGA ROSAT ARNIE