How do I examine the beam images and judge if the calibrator was bright enough?
• After the processing is completed, click the “Show raw data” checkbox (pointer to the checkbox). The top row is the raw timestream from the receiver in the three maps. The second row has had baselines removed. The bottom row shows the corresponding beam maps. You should see several significant detections of the source in all three timestreams, and a symmetric right/left, +/- pattern in all three images. If you do not, then the source was not bright enough. Here is an example where the source was too faint. Here is an example where the source is bright enough (10 K at 43 GHz), but the sky or the receiver became too unstable in the third map, which comprimised the solutions. Here is an example of a fairly clean Ka/CCB dataset on BL Lac = 2202+4216. You can always re-examine these data after your observing run by running Astrid in Offline mode, going to the OOF tab, and typing in the project name and initial scan number of your OOF map.
Related Questions
- Why does the Stylus 810 limit the size (resolution) of images shot in certain Bright Capture-enabled shooting and scene modes?
- How come some of the images at Max Galleries look so bright that it looks like the colors are washed out?
- Why do some images go very bright occasionally when using the Osprey 100?
