CO observations of IRAS Circular No. 9 sources 19520 + 2759 and 01133 + 6434 - Regions of star formation

Astronomy and Astrophysics – Astronomy

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Astronomical Spectroscopy, Carbon Monoxide, Infrared Spectra, Molecular Clouds, Star Formation, Emission Spectra, Gas Flow, Infrared Astronomy Satellite, Line Spectra, Radio Sources (Astronomy)

Scientific paper

The detection of strong CO line emission from IRAS Circular No. 9 sources 19520 + 2759 and 01133 + 6434 is reported, suggesting that these sources are embedded in extended molecular clouds. The agreement between the velocities of the CO line peaks and the velocities of H2O and OH masers previously observed toward these objects, and the fact that the line intensities around 01133 + 6434 have a maximum at the position of the infrared source, imply that the molecular gas is locally heated by the embedded source. In addition, the observed line profiles display wing emission similar to the line wings associated with mass outflows from star-forming regions. It is concluded that 19520 + 2759 and 01133 + 6434 mark the sites of recent star formation in large molecular clouds and are not evolved stars as suggested in IRAS Circular No. 9. The inferred momentum fluxes of the flows exceed the respective photon momentum fluxes by only a factor of 3, which is smaller than the ratios characterizing previously observed high-velocity outflows.

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