Far infrared observations of pre-protostellar sources in Lynds 183^*

¹ Observatory, Tähtitorninmäki, PO Box 14, 00014 University of Helsinki, Finland
² Max-Planck-Institut für Astronomie, Königstuhl 17, 69117 Heidelberg, Germany
³ ESTEC/SCI-SAF, Postbus 299, 2200 AG Noordwijk, The Netherlands
⁴ ISO Data Centre, ESA Satellite Tracking Station, Villafranca del Castillo, PO Box 50727, 28080 Madrid, Spain

Corresponding author: K. Lehtinen, kimmo.lehtinen@helsinki.fi

Received: 15 March 2002
Accepted: 24 September 2002

Abstract

Using ISOPHOT maps at 100 and 200 μm and raster scans at 100, 120, 150 and 200 μm we have detected four unresolved far-infrared sources in the high latitude molecular cloud L 183. Two of the sources are identified with 1.3 mm continuum sources found by Ward-Thompson et al. ([CITE], [CITE]) 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 (~8.3 K) and masses (~1.4 and 2.4 ). 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 L 183.