ISOPHOT observations of Nobeyama dense cores in the ρ Ophiuchi cloud

Details ISOPHOT observations of Nobeyama dense cores in the ρ Ophiuchi cloud ISOPHOT observations of Nobeyama dense cores in the ρ Ophiuchi cloud

Mar 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999esasp.427..505o&link_type=abstract

The Universe as Seen by ISO. Eds. P. Cox & M. F. Kessler. ESA-SP 427., p. 505

Computer Science

1

Dense Core, Protostar, Ρ Ophiuchi

Scientific paper

We have conducted a deep ISOPHOT survey searching for the precursors of low-luminosity or cold Class 0/I objects, and investigating the nature of the dense cores at 50, 105 and 180 μm. Our observations cover all the dense cores in the ρ Ophiuchi star forming region except for the dense cores associated with IRAS point sources. These dense cores are identified by our previous observations of C18O (J=1-->0) and H13CO+ (J=1-->0) emission lines covering the entire L1688 cloud with the Nobeyama Radio Observatory 45-m telescope. Comparing the ISOPHOT observations with the previous IRAS data, there is a reasonable agreement between ISOPHOT and IRAS fluxes. The rms noise level in the ISOPHOT survey indicates that the sensitivity is about one order of higher than that of IRAS survey. These sensitive observations enable us to detect new sources that were not identified by IRAS survey. In this survey, roughly 20 % of these dense cores are identified in all the three bands of ISOPHOT and 45 % are in either two or one bands. Based on the difference between the millimeter molecular line emission and the far-infrared dust continuum emission, we have identified several types of the dense cores.

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