findsources.xml

Find sources using VizieR catalogs and create an outlierfile for input to clean Find sources using VizieR catalog queries and create an outlierfile for input to clean; useful for making flanking images of bright sources Name of output outlierfile to produce Central position for catalog query (byfield, bycoord) byfield byfield bycoord Name of input visibility file Field name or index Right ascension (decimal degrees) 0.0 Declination (decimal degrees) 0.0 Catalog name (see http://vizier.u-strasbg.fr/viz-bin/VizieR) NVSS VizieR catalog flux density key S1.4 VizieR catalog flux density limit 0.0 Inner radius for catalog search (arcminutes) 0.0 Outer radius for catalog search (arcminutes) 10.0 x and y image sizes in pixels 256256 Clobber/overwrite existing files? False 0.0 0.0 This task queries the selected VizieR catalog around coordinates defined by either the phase center of a source in the input visibility file or an input RA, Dec. It creates an outlier file which can be used by clean to create images of flanking fields. This is particularly useful if there is a bright source relatively nearby which would create imaging artifacts if ignored. Any VizieR catalog may be used -- check the list at (http://vizier.u-strasbg.fr/viz-bin/vizHelp?cats/U.htx) for useful catalog abbreviations. Note that some abbreviations are ambiguous: in this case, use the full catalog name, or VizieR will query multiple catalogs. VizieR input and output files are saved as 'VizieR_query-yyyy.mm.dd-hhmmss.txt' and 'VizieR_return-yyyy.mm.dd-hhmmss.txt' in the working directory. Keyword arguments: outlierfile -- name of output outlierfile querycenter -- Either 'byfield', in which case it will use the phase center of the requested object, or 'bycoord', in which case it will use the input RA and Dec for the center coordinates of the catalog query. vis -- Name of input visibility file; needed if querycenter = 'byfield' to determine phase center of source. Example: vis = 'obs.ms' field -- Field name or index around which to perform query; needed if querycenter = 'byfield'. Example: field = '0' or field = '0137*' (where the asterisk indicates a wildcard match) ra -- Right ascension around which to perform query (decimal degrees); needed if querycenter = 'bycoord'. Example: ra = 12.34567 dec -- Declination around which to perform query (decimal degrees); needed if querycenter = 'bycoord'. Example: dec = -12.34567 catalog -- Catalog to query via VizieR (http://vizier.u-strasbg.fr/viz-bin/VizieR). Example: catalog='VIII/81A/sumss2_1' fluxparam -- VizieR catalog flux density key. Check VizieR for appropriate values. Example: fluxparam = 'Fint' (for FIRST) fluxlim -- VizieR catalog flux density limit corresponding to fluxparam. Sources below this value will not be included in the outlierfile. Must be set to zero if fluxparam is left blank. Units will depend on the chosen catalog's units for fluxparam. Example: fluxlim = 10.0 minradius -- Inner radius for producing outlier file (arcminutes). Any source found within this radius will be ignored. Example: minradius = 0.167 will ignore sources less than 10 arcseconds from the query center. maxradius -- Outer radius for catalog search (arcminutes). Example: maxradius = 100.0 imsize -- array containing the [x, y] image size (pixels) to write into the outlier file. This will be used by clean to determine image sizes. Example: imsize = [1024, 1024] clobber -- boolean parameter which sets whether or not findsources will overwrite an existing outlierfile of the requested name. default = False -- do not overwrite. async -- Run asynchronously default = False -- do not run asychronously.

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