Mathematics
Scientific paper
Oct 1999
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999alma.confe..49p&link_type=abstract
Science with the Atacama Large Millimeter Array (ALMA), Associated Universities, Inc., held October 6-8, 1999 at Carnegie Instit
Mathematics
Molecular, Cloud, Wavelength, Flux
Scientific paper
Many studies of molecular clouds require quantitative comparisons of images at widely different wavelengths. For example, one may map dust spectral index variations to search for evidence of grain growth in protostellar cores, or use 3-2/2-1/1-0 C18O line ratios to derive gas kinetic temperatures, or search for chemical abundance anomalies caused by shocks or MHD waves. ALMA will dramatically improve the accuracy of these measurements because it will provide almost complete sampling of visibilities across the u,v plane, allowing one to synthesize mathematically perfect, matched beams at different wavelengths. The reliability of such comparisons will be limited by the difficulty in measuring the flux from extended structures. For a homogeneous array such as ALMA, visibilities on spacings smaller than the antenna diameter are recovered by mosaicing. Pointing and surface errors lead to errors in these data, limiting the image fidelity (Cornwell, Holdaway, & Uson 1993), particularly at submillimeter wavelengths. One could improve the image fidelity by measuring the short spacing visibilities directly with an auxiliary array of smaller antennas.
Plambeck Richard L.
Wright Mel C. H.
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