we have made deep rosat exposures (80ksec) in a field at the sgp. optical follow-up first showed that many of the x-ray sources detected are qsos accounting for 30-50% of the 1kev x-ray background. at fainter fluxes (s(0.5-2kev)=3x10-14 ergs cm-2s-1) we detect an increasing number of apparently normal galaxies. these galaxies could account for as large a fraction of the 1kev background as the qsos but the x-ray emission mechanism for these galaxies is currently unknown. first we are proposing to make isophot observations of 14 x-ray luminous sgp galaxies at 60 and 100um to detect the dust that may be present and assess the amount of star forming activity taking place to distinguish between models for the x-ray emission. second, we are proposing to make isophot observations of a complete x-ray selected sample of 16 qsos in the same field to characterise the fir properties of typical, radio quiet qsos at fainter luminosities and higher redshifts than has previously been possible. we also propose to study the (restframe) near ir emission of a subsample of high redshift qsos to test claims of an underlying power law continuum correlating near ir and x-ray luminosity.
Instrument
PHT22
Temporal Coverage
1996-06-20T13:02:17Z/1997-01-04T02:14:07Z
Version
1.0
Mission Description
The Infrared Space Observatory (ISO) was the world's first true orbiting infrared observatory. Equipped with four highly-sophisticated and versatile scientific instruments, it was launched by Ariane in November 1995 and provided astronomers world-wide with a facility of unprecedented sensitivity and capabilities for a detailed exploration of the Universe at infrared wavelengths.
