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A well-instrumented Green Bank Telescope (GBT) operating at high frequency represents a unique scientific resource for the US community. As a filled-aperture, 100m-diameter telescope, the GBT is ideally suited to fast mapping of extended, low surface brightness emission with excellent instantaneous frequency coverage. This capability makes the GBT...
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Context 1
... focal plane array, large areas can be imaged in a reasonable time. As an example, a 10' x 10' region can be imaged to 0.14 K rms in 5.6 hr with velocity resolution of 0.05 kms -1 . This should give exquisite images of C 18 O emission delineating the column density distribution, together with detailed information on the kinematics of the gas (see Fig. 6 for an ARGUS commissioning map of a brighter isotopologue, 13 CO, in Orion). HCN and HCO + will require significantly less time, ~ 1.5 hr. The spatial dynamic range (image size/angular resolution) is hundreds for these maps, providing the context that allows the assessment of longitudinal flows leading to core formation, and transverse ...
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... emphasized above, placing these arrays on the GBT takes advantage of the high resolution afforded by it, while achieving the unparalleled surface brightness sensitivity of a single dish. Figure 6 illustrates this capability, showing 13 CO J = 1-0 line emission from the DR21 region. This map covers about 2' by 10' on the sky, with the beam size shown in the lower left corner. ...
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