Far infrared observations of pre-protostellar sources in Lynds 183

Abstract

Using ISOPHOT maps at 100 and 200um and raster scans at 100, 120, 150 and 200um we have detected four unresolved far-infrared sources in the high latitude molecular cloud L183. Two of the sources are identified with 1.3mm continuum sources found by Ward-Thompson et al. and are located near the temperature minimum and the coincident column density maximum of dust distribution. For these two sources, the ISO observations have enabled us to derive temperatures (about 8.3 K) and masses (about 1.4 and 2.4 solar masses). They are found to have masses greater than or comparable to their virial masses and are thus expected to undergo gravitational collapse. We classify them as pre-protostellar sources. The two new sources are good candidates for pre-protostellar sources or protostars within L183.

12 pages, 7 Postscript figures, 1 JPEG figure. Accepted for publication in Astronomy & Astrophysics

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• OH 18 cm Transition as a Thermometer for Molecular Clouds
• BIMA N2H+ 1-0 mapping observations of L183 -- fragmentation and spin-up in a collapsing, magnetized, rotating, pre-stellar core
• Detection of H2D+ in a massive prestellar core in Orion B
• Polarization of seven MBM clouds at high galactic latitude
• The Effect of Far-infrared Radiation on the Hyperfine Anomaly of the OH 18 cm Transition