The ROSAT mission is governed by two scientific objectivies,
the first all-sky survey with an imaging X-ray and EUV telescope
and the detailed study of selected X-ray und EUV sources.
As the primary objective ROSAT has performed in a
scan mode the first all-sky survey with imaging
telescopes in the soft X-ray band of 0.1 keV - 2 keV
(corresponding to wavelengths of 100 Å - 6 Å)
as well as in the adjacent extreme ultraviolett region of
0.04 keV - 0.2 keV
(corresponding to wavelengths of 300 Å - 60 Å).
This part of the mission lasted half a year, and was completed
in February 1991. Thereby, sources have been recorded whose
intensity is a hundred times weaker than the weakest sources
in earlier X-ray surveys.
The scientific harvest has been accordingly rich.
More than 60,000 X-ray sources have been detected with the
ROSAT all-sky survey , larger by almost two orders of magnitude
than the 840 sources of the catalog of the previously
largest all-sky survey of the HEAO-I satellite.
Following the all-sky survey, for over seven years to the
present time, ROSAT continues to provide detailed observation
of selected sources with respect to spatial structure, spectra
and time variability. In this pointing mode the
sensitivity has been at least two times larger than that of former
missions. The location of the sources can be determined with an
accuracy of at least 10 arcsec. The observation time is advertised
and distributed world-wide to almost a thousand guest observers.
All together, so far more than 9,000 pointed observations have
Copyright © 1998 Max-Planck-Institut für extraterrestrische Physik,
85740 Garching, Germany.
The ROSAT project is run by the German Aerospace Center (DLR) (former DARA),
Bonn, by order of the Bundesministerium für Bildung, Wissenschaft,
Forschung und Technologie (BMBF). All rights reserved.
© X-Ray Group at MPE (group)
last update:, editor of this page: