parts of the 100 micron emission of near-by clouds have no or little counterpart at 60 micron. this cold component display in several clouds a spectacular network of small and filament-like cold structures. at the edge of the cold structures, the 100 micron gradient is often not resolved by iras. in star forming regi ons, most of young protostellar objects are included inside these cold emission regions. the goal of this proposal is to understand the physical processes giving rise to these cold emission (increase in size of very small grains by mantle formation or mutual coagulation of grains?) and the connection between the evolution of the dust and the condensation of matter. we propose to map several cold structures on large scale (30. or more) at 90 and 200 micron with pht-c. the spatial resolution should allow to resolve the transition regions, and observations at wavelength longer than iras may reveal color changes within the cold regions. selected regions have no identified star formation and limited extinctions.
Instrument
LWS02 , PHT22
Temporal Coverage
1996-11-19T03:26:51Z/1997-11-02T03:27:56Z
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.
