we propose to map with isophot three low-background fields containing at least one cobe pixel (0.32 deg x 0.32 deg) in three wavelength bands (25 micron, 100 micron, 180 micron). with these measurements we want -- to detect arcminute structure in the zodiacal light and hence the interplanetary dust cloud -- to search for extragalactic background light in the cosmological window longward of 100 micron and for the brightness fluctuations associated with it -- to better relate the cobe and iso calibrations for wavelenghts r^ant to zodiacal light and extragalactic background light, in particular for the brightnesses of low-background fields. with this proposal we expand similar measurements, which were contained in the guaranteed time programme at a minimum level, to a more significant coverage. \tnote: these are no fixed time observations, but there are optimum \t\tdates for the observations to be performed. see table in the \t\tintroductory part of the jusitification\tsection. \tnote: these are no concatenated observations to keep a better chance for \t\tthem to be scheduled, but they gain considerably scientifically \t\tif performed close in time (within one orbit or a few days). \tnote: absolute calibration is very important for these observations. \t\tcalibration of the used instrument modes therefore should be \t\tdone as closely as possible before or after the measurements, \t\toptimum would be in the rpeceding or following orbit.
Instrument
PHT03 , PHT22
Temporal Coverage
1996-11-01T17:54:19Z/1996-12-19T01:31:11Z
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.
