X-ray evidence for a buried quasar in Cygnus-A
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X-ray evidence for a buried quasar in Cygnus-A
Keith Arnaud
Lab. for High Energy Astrophysics, NASA/GSFC,
Greenbelt, MD, USA
and
Astronomy Dept., Univ. of Maryland, College Park, MD, USA
Abstract:
The history of X-ray observations of Cygnus-A and how they
provide evidence for the existence of a buried quasar are reviewed.
Then new results from the ASCA satellite are presented. These
demonstrate the existence of an heavily-absorbed X-ray emitting point
source coincident with the radio core.
Keith Arnaud
(kaa@genji.gsfc.nasa.gov)