we propose observations to determine the infrared flux density of the supernova remnant 3c58. this is a filled-centre remnant, with a flat synchrotron spectrum at radio wavelengths, but with indications of a spectral turnover at wavelengths less than a few mm from the available (iras) infrared upperlimits. such a spectral turnover is either intrinsic to the emission mechanism at work in this object (presumably produced by a central, as yet unidentified pulsar: cf. the crab nebula), or is due to synchrotron losses, with little current energy input. deeper infrared observations will determine the position and form of the spectral turnover, which in turn constrains the particle acceleration mechanisms at work.
Instrument
PHT22 , PHT37 , PHT38 , PHT39
Temporal Coverage
1997-03-03T18:44:38Z/1997-03-03T20:51:22Z
Version
1.0
Mission Description
The Infrared Space Observatory (ISO) was the worlds 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.
