Small Scale Structure in the Taurus Molecular Cloud: OH and CO Observations Towards Six Extra-galactic Continuum Sources

Details Small Scale Structure in the Taurus Molecular Cloud: OH and CO Observations Towards Six Extra-galactic Continuum Sources Small Scale Structure in the Taurus Molecular Cloud: OH and CO Observations Towards Six Extra-galactic Continuum Sources

Dec 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000aas...197.0506k&link_type=abstract

American Astronomical Society, 197th AAS Meeting, #05.06; Bulletin of the American Astronomical Society, Vol. 32, p.1394

Astronomy and Astrophysics

Astronomy

Scientific paper

Further results from of a study of six small sites in the Taurus molecular cloud will be presented. Each site was chosen because it was in a dense region of molecular material, with a strong extra-galactic radio continuum source behind it. The OH 1667 MHz and 1665 MHz lines were observed in absorption against the background continuum sources, on five separate occasions over a period of fifteen months, using the Arecibo Observatory 305 m telescope. Due to differential galactic rotation and the earth's motion around the sun, the line of sight toward the radio sources changed with respect to the cloud over that time. No changes in the line profiles were seen, setting lower limits on any small scale structure. The area around each source was mapped in emission in the 1->0 line of CO, C18O, and 13CO using the FCRAO 14 m telescope, and the 2->1 line of C18O, and 13CO using the CSO 10 m telescope. This data has been combined with interferometry data from BIMA of 13CO and C18O emission for several of the sites, to model local cloud conditions such as density, temperature, and structure. A 'clumpy' cloud model based on the large velocity gradient approximation has been developed to merge the absorption and emission data. The implications for small scale structure in molecular clouds will be discussed.

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