BEAM MAPS FOR A1963

The table below shows final beams maps for the 12 azimuths at which NGC 2903 was observed. The leftmost column shows the azimuth. A single number indicates that a single set of drifts contribute to the maps; otherwise, scans at the azimuths on the second line were combined in (roughly) the given proportions to produce the beam maps shown. The plots are logarithmic in instensity, the greyscale ranges from 0.005 to 1 Jy, and the contours are at 5%, 10% and 50%. Click on one of the thumbnails to bring up the corresponding postscript file.

Note that beams 1, 3, 4, and 6 were cut off in the raw drift maps; the edges of these beams were convolved with a gaussian (2.3' FWHM) at the cutoff edge to avoid introducing artifacts during the cleaning process. (The beam itself is not convolved but the sharp edge has been smoothed.) The double-peaked sidelobes of az 153 and 200 are thus a result of the limited sampling of the first sidelobe (see beam 4 for example). Also, note that there are still a couple of beams that do not have point sources removed, something that will be done asap. See Beam 5 of AZ197, for example. Otherwise, though, the table below gives a pretty good indication as to how the beam changes with azimuth.

The fits files for the beams can be found here, FINALBMn_AZ***.FITS, n=0..6, ***=azimuth (see table)

Azimuth (MAJxMIN@PA of Avg Bm-jmfit)	Beam 0	Beam 1	Beam 2	Beam 3	Beam 4	Beam 5	Beam 6
104 =(2*103+106)/3 (208.5X204.9@91.2)
107 =(2*106+109)/3 (208.5X208.1@91.2)
109 (209.9X207.3@91.1)
116 (209.0X209.1@92.4)
128 =(8*127+136)/9 (202.4X212.2@92.7)
153 =(9*149+2*171)/11 (194.1X221.6@93.1)
200 =(10*197+2*215)/12 (189.3X224.7@87.6)
230 =(226+234)/2 (201.8X213.6@87.0)
245 =(243+2*246)/3 (207.5X210.4@87.9)
250 (209.5X211.1@88.6)
253 (208.1X214.4@88.7)
255 (210.0X211.8@88.6)

Last revised December 9, 2005, by KS

Judith A. Irwin