Last Update: 22th November 2017
Changes in ... | General Changes | Obstable | Source Table | Reference Table | Scan Table | Device Table |This page shows a summary of differences between the nobs and the zobs. This information would be useful for familiar users of the Nobeyama 45-m telescope. Please note that some issues will be changed in future developments of the nobs.
Refrence Table | Information of reference positions can be specified in the Reference table, which is newly added to the nobs. |
Extensions of the tables are changed as follows; zobs: *.observe, *.source, *.scan, *.device nobs: *.nobserve, *.nsource, *.nreference, *.nscan, *.ndevice, *.ndebug *.ndebug is automatically generated in the open-use version of nobs. |
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*nobserve has 7 character limit (no change from the zobs), while other tables have 16 character limit. | |
A filename must start with a-z, and subsequent characters should be a-z, 0-9, _, and -. Capital characters are not accepted. |
In the zobs, a project name is required when starting-up the software. On the other hand, the project name can be specified and changed in the Project tab. |
The 'Heliocentric' option in Velocity Frame is removed. | |
'Solar Object', which is for specifing solar system objects, is removed. | |
The coordinate system must be shared in that in the Reference table. | |
New parameter: If needed, you can specify the region name of the target source as you like. The character limit is 16. |
You can set up to 9 reference positions in this table. | |
In 'Sequence Pattern' in the scan table (for Single Point, OTF, and Multi Point scan), you can specify the reference positions with their IDs, 1-9, in the Reference table. | |
For the On-On scan mode, ID (1) in the refrence table is used as the blank sky. | |
The coordinate system must be shared in that in the Source table. |
In 'Sequence Pattern' in the Scan table (for Single Point, OTF, and Multi Point scan), you can specify the reference positions with their IDs, 1-9, in the Reference table. | |
The beam rotation angle of the receiver stage is specified in the device table in the zobs,
while in nobs it is moved to the scan table.
You should note that the definition of the beam rotation angle is different between the zobs and the nobs as summarized in figure below:
![]() In the zobs the zero point of the beam rotation angle and the scan position angle are common, whereas the beam rotation angle in the nobs is defined as an offset angle from the scan position angle. In other words, [Beam rotation angle in the zobs] = [Beam rotation angle in the nobs] + [Positon angle]. |
'Coordinate system' is removed. | |
New parameters:: In the nobs, multiple reference positions can be specified. |
The 'On-On' observations can be performed with the Beam 1 and Beam 3 of FOREST. The beam separation is ~71''. |
'Block' is introduced.
The concept of 'Block' is illustrated in the figure below:
![]() New parameters: Number of Blocks, block spacing, Block Begin, Block End. These new parameters are fixed in the 2017-2018 observing season. |
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New parameters: The total number of the scan rows. |
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It is moved from the device table to the scan table. In the open-use program it is fixed to 0.1. |
This is called “Pointing” in the zobs. | |
In 'Sequence Pattern', on-positions are specified using 0-9 in the zobs, while alphabet, a-z, is used in the nobs. | |
The parameters are the same as in zobs, but the position angle is removed. |
This is called 'Random' in the zobs. | |
The definition of 'Calibration interval' is changed. In the nobs, it is counted in the number of the observation sequence. |
The Spectral Window (SpW) mode is implemented, and the number of the arrays in the Backend tab is increased from 16 to 32 (A17-A32 are for the SpW mode). | |
The names of the following receivers are changed. H20ch1 -> H22R, H20ch2 -> H22L, TMULT -> FOREST. |
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The names of the following parameters are changed. Rx -> Frontend (FE), SB -> IF, Center Freq -> Rest Freq., LO2 Freq. -> LO(DC) Freq. |
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The names of the IFs (sidebands) are changed as follows: USB-H, USB-L, LSB-H, LSB-L |
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New parameters: Comments (in the Frontend tab): Free space with the maximum number of characters of 100. SpW mode: Disalbe/Enable (in the Backend tab) The checkboxes next to the arrays (in the Backend tab): You have to check the boxes of the arrays which you use in the observation. Be aware that the arrays without checks will not observed. |