HCO(+) survey of unassociated compact molecular clouds in the IRAS Point Source Catalog

Details HCO(+) survey of unassociated compact molecular clouds in the IRAS Point Source Catalog HCO(+) survey of unassociated compact molecular clouds in the IRAS Point Source Catalog

Sep 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987mnras.228...43r&link_type=abstract

Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 228, Sept. 1, 1987, p. 43-54.

Astronomy and Astrophysics

Astronomy

55

Astronomical Catalogs, Formyl Ions, Infrared Spectra, Molecular Clouds, Point Sources, Gas Density, Hydrogen Clouds, Infrared Astronomy Satellite, Interstellar Masers, Radiant Flux Density

Scientific paper

Criteria for discriminating between compact molecular clouds (CMCs) and other sources in the IRAS catalog are established by a color comparison of such sources with infrared sources associated with nonstellar masers. Using these criteria, candidate CMCs were selected which are unassociated (i.e., not given an 'association' in the IRAS catalog) with known H II regions or molecular clouds. The candidate sources were searched for HCO(+) emission to test whether they are indeed dense molecular clouds; 24 detections out of 34 were obtained, thus verifying the selection procedure. Most CMCs are associated with H II regions; the unassociated sources often lie in regions of the sky not covered in radio continuum surveys. Five sources with a 60-micron flux density greater than 500 Jy lie within the Bonn survey region but have not been detected as H II regions: they may be sources heated either by stars too weak to be detected in the Bonn survey or by very luminous stars at distances of greater than about 10 kpc which are at a very early stage in their evolution.

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