Interstellar dust emission Small Magellanic Cloud comma SMC

scientific abstract the aim of this proposal is to investigate the properties and life cycle of dust throughout the universe. we intend to fully study with isophot the dust in objects, too faint to be observed in the infrared by any other means than a cold telescope in space equipped with a sensitive photometer. this proposal will take advantage of the full spectral range 2.5240 micrometres. we will utilize other studies of the central program (where often dust is not the scientific target) with the goal of building up a coherent data base for dust properties in different objects and locations. isophot has unique capabilities for the study of dust in the following two research areas and these have the highest priority: 1. the properties of dust in the cirrus clouds. 2. search for and properties of very cold dust (ca. 10 k). observation summary we emphasize that the various inter and circumstellar substudies of this proposal will be analyzed and summarized with the goal to gain a comphrehensive picture of dust in the universe from the solar system to intergalactic space. the observational and technical approach is for most of our substudies similar, and is connected to the problems of measuring faint surface brightnesses and separating them from the often much brighter zodiacal emission. observing parameters (e.g.filters) and target lists for the mapping are given separately under the section scientific_justification. 1. cirrus and related clouds(autumn launch 72382 s/spring launch 72469s) faint cirrus and gas heating in cirrus/translucent clouds: abundances and properties of the various dust particles (pahs, small, large) will be studied in different areas of cirrus clouds. one of the targets, the ursa major cloud, has areas which consist mainly of hi, the other target, g300.216.8 (chamaeleon), is associated with molecular gas. l1780 (autumn launch) and l1642 (sprin trun [truncated!, Please see actual data for full text]