tag:blogger.com,1999:blog-8698858162387672100.post4484166476036690093..comments2023-04-14T08:53:35.419-05:00Comments on Collected Shreds of AIPS Wisdom: self-calibration subtleties : 2 questionsLaurahttp://www.blogger.com/profile/14007910800783392253noreply@blogger.comBlogger2125tag:blogger.com,1999:blog-8698858162387672100.post-5858588279143289782007-07-04T17:03:00.000-05:002007-07-04T17:03:00.000-05:00This comment has been removed by a blog administrator.Anonymousnoreply@blogger.comtag:blogger.com,1999:blog-8698858162387672100.post-60384537405283167172007-06-30T12:51:00.000-05:002007-06-30T12:51:00.000-05:001) Self-cal is notoriously bad with diffuse emiss...1) Self-cal is notoriously bad with diffuse emission. I'd go with the the weighting that emphasizes the point sources more. However, just a note that self-cal can mess up your diffuse flux if you're not careful (see point 2...)<BR/><BR/>2) It's best if you use the entire primary beam, for the simple reason that there is flux in point sources outside your inner 15%. It's important that you know where your flux is coming from - if you don't use the whole primary beam you can wind up including flux from point sources outside your 15% into your diffuse source at the center. <BR/><BR/>NOTE: This ALSO applies if you have a very very bright pointsource OUTSIDE the first null as well, and if you are trying to push down close to the confusion limit. If you still wind up with weird numbers and/or a pattern which suggests there's something bright you haven't accounted for, it might be worth checking to see if there's a very bright source feeding flux in from one of the sidelobes.Kishahttps://www.blogger.com/profile/06904288403617995781noreply@blogger.com