observations of complex hii regions with known infrared sources associated with them are proposed. these observations will be carried out by using the lws and the sws instruments in their high and medium resolution modes. two regions in the galactic plane have been chosen for detailed study, ngc6334 and ngc6357, with the two high sensitivity iso spectrometers. after launch, iso offers the only access to the wavelength regime of interest for lines from oiii, niii, nii, oi, cii, si, siii, siii si, oh, co, ammonia and water in the mid and far infrared. these lines are ideal tools for probing visibly obscured regions. lws and sws will also be used in their medium resolution grating modes to obtain information about the spectral shape of the far infrared contiuum from the dust in the sources and also to determine which other lines are being emitted in the near and far infrared by these sources. lws will be used to map areas centred on each of the selected positions in both high and medium resolution modes while sws will be used to obtain data at, or very close to, the peaks of the sources. the sws lines have been chosen principally to originate from high electron density regions closer to the powering sources of the objects while those monitored by the lws arise further from the source centre and closer to or into the molecular cloud. electron density, line flux and abundance variations maps will be produced for each region and any structures within them should become apparent i.e. shocked, density bounded or ionisation bounded regions.
Instrument
LWS01 , LWS04 , SWS01
Temporal Coverage
1996-10-08T14:19:58Z/1997-04-03T19:55:16Z
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.
