Last Update: 21st June, 2016

Status Report for Open Use Observations, December 2016 -- May 2017


This status report summarizes of the instrumental status of the 45-m telescope such as an antenna, receivers and back-end. Important changes of the status compared with previous season are as shown below.

System Overview




Figure 1: Schematic system block diagram of the 45-m Telescope.

Capability of the 45-m Telescope for this season

Table 1: Summary of capability of the 45-m Telescope for this season
Notes: Hatched parts are the new capabilities.

Location of the Nobeyama 45-m Telescope

Antenna

Beam Size and Efficiency

Table 2: Latest Measurements of Beam Size, Beam Efficiency and Aperture Efficiency
Notes: The errors of the efficiencies are mainly due to the uncertaininty of brightness temperature of the planets.

Pointing Accuracy and Strategy

misc.

Frontends

Backends

SAM45 (Spectral Analysis Machine for the 45-m telescope) : for spectroscopic observations

Available Settings without Spectral Window (SpW) mode

Table 3: Available Settings without Spectral Window Mode
IF - SAM45 Channel Separation (kHz) # of Channels Bandwidth (MHz)
IF01 - 08
Sub-Array 1
SAM45 A01 - 08
3.81
7.63
15.26
30.52
61.04
122.07
244.14
488.28
4096 15.625
31.250
62.500
125.000
250.000
500.000
1000.000
2000.000







effectively 1600 MHz
IF09 - 16
Sub-Array 2
SAM45 A09 - 16
3.81
7.63
15.26
30.52
61.04
122.07
244.14
488.28
4096 15.625
31.250
62.500
125.000
250.000
500.000
1000.000
2000.000







effectively 1600 MHz

Available Settings with Spectral Window (SpW) mode: FOREST only

Table 4: Available Settings with Spectral Window Mode
IF - SAM45 Channel Separation (kHz) # of Channels Bandwidth (MHz) Channel Separation (kHz) # of Channels Bandwidth (MHz)
IF01 - 08
Sub-Array 1
SAM45 spw1: A01 - 08 SAM45 spw2: A17 - 24
3.81
7.63
15.26
30.52
61.04
122.07
244.14
488.28
2048 7.8125
15.6250
31.2500
62.5000
125.0000
250.0000
500.0000
1000.0000
3.81
7.63
15.26
30.52
61.04
122.07
244.14
488.28
2048 7.8125
15.6250
31.2500
62.5000
125.0000
250.0000
500.0000
1000.0000
IF09 - 16
Sub-Array 2
SAM45 A09 - 16 SAM45 A25 - 32
3.81
7.63
15.26
30.52
61.04
122.07
244.14
488.28
2048 7.8125
15.6250
31.2500
62.5000
125.0000
250.0000
500.0000
1000.0000
3.81
7.63
15.26
30.52
61.04
122.07
244.14
488.28
2048 7.8125
15.6250
31.2500
62.5000
125.0000
250.0000
500.0000
1000.0000

Continuum BE (for continuum observations)

Table 5: Available Setting of Continuum BE
# of channels Bandwidth (GHz)
2 2 (5 - 7 GHz)

Distribution of IFs to Backends

Spectroscopic observations with SAM45

Continuum observations with Continuum BE

Table 6: Available Connections to the Continuum BE
Receiver Beam Polarization IF Notes
H22 RHCP (ch1) USB: 5 - 7 GHz
LHCP (ch2) USB: 5 - 7 GHz
Z45 H USB: 5 - 7 GHz
V USB: 5 - 7 GHz
FOREST 1 H USB-L: 5 - 7 GHz Chose 2 IFs
USB-H: 8 - 10 GHz
LSB-L: 5 - 7 GHz
V USB-L: 5 - 7 GHz
USB-H: 8 - 10 GHz
LSB-L: 5 - 7 GHz

Observing Modes

Spectroscopic observations with SAM45

Three(3) oberving modes, position switching (PoSW), On-The-Fly (OTF) mapping, and ON-ON, are available. Frequency switching is NOT available. Chopping/wobbing of the sub-reflector is NOT available. Beam switching is NOT available for spectroscopic observations.

Continuum observations with Continuum BE

Four(4) scan modes, On-Source, On-Off scan, cross scan, and raster scan, are available. Beam switching with chopper wheel is always used. Chopping/wobbing of the sub-reflector is NOT available.

Absolute Intensity Calibration

Spectroscopic observations with SAM45

Continuum observations with Continuum BE

Observations and Monitors

On-Site Observation from Nobeyama Radio Observatorn (NRO)

Remote Observation

Data Reduction

Spectroscopic observations with SAM45

Continuum observations with Continuum BE

Appendix

Detailed Information on Frequnecy Down-Conversions in FOREST and IF Chain




Figure 2: Schematic diagram of frequency down-conversions from 2SB mixer to AD converters.

Table 7: Available Patterns of Connections
Notes:

Special Notes for Spectral Window Mode of SAM45 with FOREST

Table 8: Summary of Available Setups of FOREST + SAM45 Spectral Window Mode
Notes:




Figure 3: Schematic view of an example setting of Spectral Windows.




Figure 4: Schematic view of frequency setups from FOREST to SAM45 (Spectral Window mode)

Example Setups

Example 1) 12CO(J=1-0), 13CO(J=1-0), C18O(J=1-0)




Figure 5: Example setup for 12CO, 13CO, and C18O.

Example 2)13CO(J=1-0), C18O(J=1-0), SO, CS(2-1)




Figure 6: Example setup for 13CO, C18O, SO, and CS.

Example 3)13CO(J=1-0), C18O(J=1-0), SO2, N2H+




Figure 7: Example setup for 13CO, C18O, SO2, and N2H+.


2016-06-21