Statistics – Applications
Scientific paper
Dec 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007aas...21115403c&link_type=abstract
American Astronomical Society, AAS Meeting #211, #154.03; Bulletin of the American Astronomical Society, Vol. 39, p.1006
Statistics
Applications
Scientific paper
The impact of stellar outflows on their surrounding medium has important consequences on our understanding of star formation in general and the progression of star formation in clouds. This influence is best studied in the millimeter where line emission from the high velocity outflows directly influences the lower velocity cloud emission. However, the imaging of such regions requires the detection of faint cloud emission in the presence of bright outflows over relatively large fields. Until recently, such observations were not feasible. While new facilities and upgrades to existing observatories provide the necessary sensitivity, previously ignored systematic effects begin to dominate image quality and the achievable dynamic range. The recently commissioned Combined Array for Research in Millimeter-wave Astronomy (CARMA) potentially provides the opportunity to address the large-scale influence of outflows if we can adequately account for pointing errors and the true primary beam shape. Here I report on efforts to improve the pointing accuracy of CARMA and calibrate the primary beams. I apply these techniques to mosaiced observations of a 2 x 3.5 arcminute region in NGC7538 near IRS1 and discuss the influence of the outflows on the surrounding medium as well as the general dynamics of the regions surrounding IRS1 and NGC7538S. Applications to other regions and future observatories are discussed.
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