Observation of the rho - Ophiuchi Star Forming Region with ISO PHOT, NRO 45-m, and NMA
It is well known that the central region of the rho - Oph molecular cloud harbors a number of high density regions, so called dense cores. Recently we have established an unbiased and complete sample of such dense cores with the extensive surveys in the optically thin C18O (1-0) emission line. The sample consists of as many as 90 dense cores in the 40 square arcminutes. Searching for the possible precursor of Class0/I sources and investigating the nature of the dense cores, we have conducted a deep far-infrared survey of the millimeter-wave selected sample of the dense molecular cloud cores. We have used ISO PHOT-C at 50, 105, and 180 microns, and ISO PHOT-P at 12.5, and 25 microns. These sensitive (down to 0.3 Jy at 105 microns) far-infrared surveys should clearly reveal the nature of the cores without IRAS sources. We have identified several types of the dense cores based on the difference between the millimeter molecular line emission and the far-IR dust continuum emission. This difference might be attributed to the different evolutionary stages of the dense cores.
Star Formation with the Infrared Space Observatory
- Pub Date:
- STAR FORMATION;
- DENSE CORES;