Five College Radio Astronomy Observatory University of Massachusetts
Lederle Research Tower
Amherst, MA 01003
Dept. of physics and astronomy
University of Calgary
2500 University Dr. NW
Calgary AB T2N 1N4
Mullard Radio Astronomy Observatory
Cambridge CB3 0HE
601 Campbell Hall
University of California
Berkeley CA 94720-3411
Penticton BC V2A 6K3
Beijing Astronomical Observatory
Chinese Academy of Science
People's Republic of China
While we often tend to think of HI emission in terms of distinct features (e.g. clouds, filaments), it is far from clear that this is an accurate way of characterizing the neutral hydrogen distribution. A better description may be that what we detect are wrinkles in the general HI fabric.
The plan is to investigate the power spectrum of HI along different lines of sight to determine the influence of events such as star formation and supernovae on the shape of the distribution.
Steve, Dave, Magdalen and Chris had a bit of a chat about the power spectrum project while at the Naramata ISM workshop. After sitting through many talks about turbulence etc, we were all convinced that this project is worth doing. We discussed what approach to take to tackle the mounds of data and it was decided that an automated version of the approach Dave used a few years back would probably be the best place to start.
Because it is best to deal only with the SST data (why add in the uncertainty of the single dish scale?) and because we will be looking at something in the visibility plane, we will have to go back to the individual field u-v data files. Dave has tested his software and it now reads and decodes the new (all things being relative) DRAO format .TBL and .HISTORY files for any survey and then the appropriate data and flag files (test only performed for one field so far but nothing is hardwired for that specific field). "I've still got quite a bit of work to do to get the analysis done in annuli in a general way, and then I'll have to do various tests to check things to see if the noise removal will work with the new correlator data as it did previously. In particular I'll test it with the CGPS field near the field I processed before... to ensure I get the same sort of results!" (DAG - 27Apr99)