Astronomy Seminar: Analysis of Single Dish Combination Methods
| Date/Time: | Friday, 21 Sep 2018 from 4:10 pm to 5:10 pm |
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| Location: | Rm. 38, Physics Bldg. |
| Cost: | Free |
| Contact: | Curt Struck |
| Phone: | 515-294-3666 |
| Channel: | College of Liberal Arts and Sciences |
| Actions: | Download iCal/vCal | Email Reminder |
This talk reports on the methodology and some results of testing methods and parameters of combining single dish and interferometer radio images. The metric for analyzing combinations used a ratio of the power spectrum densities of a test im-age and a true model to determine the accuracy of close UV-spacings. The methods tested were CASA's feathertask, using a startmodel in CASA's clean task, a modified joint-deconvolution CLEAN algorithm, and tp2vis. Using simulated images based on the VLA and GBT telescopes of models with various amounts and sizes of structures, many permutations of simulation and imaging parameters were tested along with the combination methods. Some preliminary conclusions are that feathering is weak without adequate single-dish UV coverage overlap, joint deconvolution works well with dirty images, multiscale deconvolution performed well with joint deconvolution with low single-dish UV coverage overlap, and images with few, simple sources do not benefit from combinations in this testing. In addition, this paper presents an open-source codebase to allow researchers to test their own models and parameter permutations to determine their best options for combining data.