scientific abstract this proposal is to investigate an all sky sample of dense molecular clouds and very cold iras sources for evidence of protostellar objects. the prime aim is to use of the high sensitivity of iso to search for pure inflow sources with no attendant outflows, and hence investigate the very first stages of stellar evolution. we would be able to determine the low end of the luminosity function of embedded ir sources in these clouds, and answer whether or not the initial mass function is truncated at around 0.7ms as suggested by some in the literature. observation summary for this part of the proposal (part 2) it is intended to observe .very cold. iras sources - defined here to have a flux at 100um of more than ten times the 60um flux. the specific purpose is to identify .low mass. protostars, so objects having a 100um flux of more than 100jy (an arbitrary limit), have also been discarded. in a final bid to reduce the target still further, only high priority sources, and sources with just 60um and 100um, have been chosen. in order to achieve reasonable photometry, the minimum integration time per filter is quoted as being 32sec. this will be used in all cases. with the c200 filter, a strip scan will be made at 200um, adding new science, possibly never again achievable. the calculations of the telescope times have been made using the manuals provided. pht-p aot - pht03 peak-up required rectangular chopping - 60 throw filter aperture integration 10 23 32 12.8 23 32 16 23 32 20 23 32 25 23 32 pht-c aot - pht32 peak-up not required 1x4 scan (single pass) concatenated observation filter integration c200 14sec per raster position (2sec per step)
Instrument
PHT03 , PHT32 , PHT40
Temporal Coverage
1996-03-06T11:11:13Z/1998-03-01T11:01:36Z
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.
