Last Update: 8th November, 2016
If there is no strong SiO maser source near your target or the maser source reachs elevation limit (El > 80 deg. or 12 deg. < El) during allocated observing time, you can do a pointing observation with continuum emitted from quasers. This often happens when your target is apart from the Galactic Plane (~9 hr < LST < ~15 hr), since most of SiO maser sources are the late-type star belonging to Our Galaxy. It will be explained how you can do a pointing observation with a continuum source in the following sections.
For continuum observation, you should make observing scripts not with the nobs but with an Obstable (an older one).
> ssh -X (YOUR ACCOUNT ID)@ut12x1.nro.nao.ac.jp
> ssh -X ut12x1.nro.nao.ac.jp -l (YOUR ACCOUNT ID)
The basic framework of Observe Table is as same as the Obstable Z: Source Table, Scan Table and Device Table. Adding to this, naming rule also holds:
As long as making observing scripts for pointing with continuum sources, it will be much easier than making other observing scripts.
By clicking the "(RA, DEC) (L, B)" button, you should have a following window.
"Cont List" button provides a list of continuum sources observable from the 45-m telescope. If you intend to perform pointing observation with continuum sources, all you need is just choose the target from the list and save with "Save" button.
With the "Scan : Cont" window accessible from pushing the "Cont" button in the Scan Table row, you can make the Scan Table for continuum observation.
Two sample files are already prepared for pointing observation with continuum sources: point2 and point4.
The difference of the two is the length of the cross scan: point2 is 2 arcminutes while point4 is 4 arcminutes.
In general, point2 suits for the aim.
Choose "point2" from "Sample List" and save with "Save" button.
Like other tables, Device Table can easily made with "Device : Cont" window which can be used by clicking the "Cont" button in the Device Table row.
Beam switching system has a trouble.
In order to avoid the trouble, please modify the sample file.
Push the "beam switch" button at the bottom of the Device Table window, you will find a new window.
Rotation speed is the one to modify.
Change the value from the default (465 rpm) to 300 rpm and then, save the Device Table.
With this procedure, you will be able to perform pointing observation without a critical trouble.
The last procedure is to make Observe Table and generate the observing scripts.
Go back to the main window and fill the text boxes with the name of Source Table, Scan Table and Device Table which you have made and name the observe table within seven charactors.
And then, push the "Save & Send" button to send it to COSMOS.