Hi Ross and all, Yes I did exactly that.
This research is one of the reasons I was so happy to get Heystek on board at HartRAO to improve our spectrometer. Better backends equal better (and more) science. Sorry I was trying to send this email to Andrew and did not check the cc list. Happy New Year all! gordon > I assume you removed the linear before performing the sine fit? > > > On Fri, Dec 30, 2022, 6:09 PM Dr Gordon MacLeod <[email protected]> > wrote: > >> Hi Andrew, >> >> Hope you are enjoying your Christmas break, Merry Christmas! >> >> I thought I'd share with you an image I've recently created on >> excited-OH >> masers at 6.035 GHz, see attached. This is not yet published nor >> released >> data. >> >> These are fitted gaussian profiles to a Zeeman pair. You can easily see >> the cyclical undulation. >> >> I fitted a sinusoid to this and found a period of 360.3+/-0.5 Days and >> NOT >> 365 days. It is not yet conclusive; more data is required. >> >> There are 3 potential possibilities to explain these results. >> >> 1. The period is 365 days and there is a source about 30-40 arcsec away >> from the beamcenter - it's possibly a baricentric/heliocentric vlsr >> correction issue. >> >> 2. It is two Zeeman pairs line-blended and one or both are periodic. >> >> and >> >> 3. It is a gravitational effect, the result of masers associated with a >> binary - when the YSOs are aligned the velocities closer... >> >> I cannot find an object at about 30" but maybe it's there. I think it is >> option 2 to be honest. >> >> Of coarse there can be other explanations but they become less and less >> likely. >> >> More to the point, this result demonstrates the sensitivity of >> monitoring >> masers and velocity drift. This is a new line of research worth >> continuing >> and using more observatories. >> >> Who knows what it will turn up. >> >> Regardless, thought of our conversation in SA when I first saw it. >> >> All the best in 2023, Happy New Year! >> >> gordon >> >> -- >> You received this message because you are subscribed to the Google >> Groups " >> [email protected]" group. >> To unsubscribe from this group and stop receiving emails from it, send >> an >> email to [email protected]. >> To view this discussion on the web visit >> https://groups.google.com/a/lists.berkeley.edu/d/msgid/casper/df7fd46e2544a2a9ed42cb2eb33c9a60.squirrel%40mail.hartrao.ac.za >> . >> > > -- > You received this message because you are subscribed to the Google Groups > "[email protected]" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to [email protected]. > To view this discussion on the web visit > https://groups.google.com/a/lists.berkeley.edu/d/msgid/casper/CAG4nf72CKGiyefxSWf-vWHrjtmgh1NELWgTFOYtXRd4Pa5fCTg%40mail.gmail.com. > -- You received this message because you are subscribed to the Google Groups "[email protected]" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To view this discussion on the web visit https://groups.google.com/a/lists.berkeley.edu/d/msgid/casper/84b34d782f65a4f7348cb93b50403cb5.squirrel%40mail.hartrao.ac.za.
