Last Update: 28th June 2021

Status Report for Open Use Observations, December 2020 -- April 2021


This status report summarises the instrumental status of the Nobeyema 45-m radio telescope such as an antenna, receivers, and backends.

Important Notice

System Overview


System Overview

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

A capability of the Nobeyama 45-m Telescope for this season

Table 1: Summary of the capability of the Nobeyama 45-m Telescope for this season
Summary of Capability
(*) Beam squint of H22 respect to H40 is ∼4 arcsec., which is small enough compared to the beam size of H22 (∼72 arcsec.) for most of the observations.

Location of the Nobeyama 45-m Telescope

Antenna

Beam Size and Efficiency

Antenna Efficiency
Notes: The errors of the efficiencies are mainly due to the uncertainty of brightness temperature of the planets.
(*) Based on the relative measurements between normal and filter modes

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 (4-Beams) 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
FE # of channels Bandwidth (GHz) Notes
Single 2 2 (5 - 7 GHz)
H22 & H40 3 (2 & 1) 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 Polarisation IF Notes
H22 RHCP (ch1) USB: 5 - 7 GHz
LHCP (ch2) USB: 5 - 7 GHz
H22 & H40 H22 RHCP (ch1) USB: 5 - 7 GHz
LHCP (ch2) USB: 5 - 7 GHz
H40 LHCP (ch1) 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
LSB-H: 8 - 10 GHz
V USB-L: 5 - 7 GHz
USB-H: 8 - 10 GHz
LSB-L: 5 - 7 GHz
LSB-H: 8 - 10 GHz

Observing Modes

Spectroscopic observations with SAM45

Three(3) observing 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

Beam switching with chopper wheel is always used. Chopping/wobbling of the sub-reflector is NOT available.

Absolute Intensity Calibration

Spectroscopic observations with SAM45

Observations and Monitors

Remote Observation

Monitor

Data Reduction

Spectroscopic observations with SAM45

Appendix

Special Notes for Spectral Window Mode of SAM45 with FOREST

Table 7: Summary of Available Setups of FOREST + SAM45 Spectral Window Mode
FOREST Spectral Window


example setting of Spectral Windows

Figure 2: Schematic view of an example setting of Spectral Windows.


Frequency Setup

Figure 3: 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)


example setup 1

Figure 4: Example setup for 12CO, 13CO, and C18O.

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


example setup 2

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

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


example setup 3

Figure 6: Example setup for 13CO, C18O, SO2, and N2H+.


2021-06-28