Quote:
Originally Posted by parejkoj
Also (I just posted a suggestion on accessing the SDSS data on the other thread), if you want to actually show that this ejection scenario is real, you need to perform a cross-correlation analysis on a very large sample of uniformly selected galaxies and quasars, like that in SDSS or 2dF. I'm not aware that anyone has actually done this, with proper controls for the quasar selection function.
Looking at individual galaxies is nice and all, but there are hojillions of galaxies out there, and you would expect plenty of chance alignments if you are not careful in how you select sources. The sampling should be uniform and random. You can't just find one (or even "many," as you claim Arp has) "aligned" system and claim it represents some new physics.
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Hi Parejkol
The "other thread" has now joined us in this thread.
Yes, what you have described is exactly what I want to do. However I want to start with a small section of sky and limited data in order to do some preliminary investigations and analysis. I understand the statistical side much better than the astronomy, so that will not be a problem for me as long as I can get advice on the technical astronomical aspects. My objective is to have a test that clearly distinguishes the different theoretical possibilities without favoring any one.
One problem when I looked at this some time back was that quasar surveys were generally not complete and so the samples were already biased. That problem would appear to have been overcome with the extensive surveys in the last decade or two.
Regards
Ray