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Home > Instrumentation > SHeFI receivers > SHeFI Calibration > Comparison spectra

SHeFI Comparison Spectra

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Introduction

On this page we present comparison spectra for the facility heterodyne receivers. They are obtained by averaging monitoring spectra taken during different dates during Calibration Plan observations.

The data

For the source-line combinations where a comparison spectrum exists, this is indicated in the table by a . Clicking on this symbol shows the corresponding spectrum. If no such spectrum exists, this is indicated by a . This can have several meanings. Either, the line is very weak or there is no line at all, in which case it is not monitored at all within our Calibration Plan program. Or, this particular source/line has been added recently to the program, in which case simply no data exist yet in our database. In those cases a spectrum will appear sometime in the future.

For all receivers, some lines are monitored in USB tuning as well as in LSB tuning, while others are only observed in one sideband (the preferred one for that frequency). To make this clear, the spectra are color-coded, with the green spectra obtained in LSB tuning, and the blue spectra in USB tuning.

APEX-1 (230GHz)

Receiver SHeFI / APEX-1 (230GHz) -- Comparison Spectra
Note - APEX-1 is a single-sideband receiver. For CO(2-1) and CO(5-4) we monitor the line in USB and LSB tunings, i.e. with the receiver tuned to place the line in upper sideband (USB) and in lower sideband (LSB). The spectra in this table show both the results of USB tuning (plotted in blue) and of LSB tuning (in green). Line strengths may be different in the two sidebands.
Species H2CO 13CO CO CH3OH CS HCN
Transition 303-202 2-1 2-1 50-40A 5-4 3-2
Frequency 218.222 220.398 230.538 241.791 244.935 265.886
o Ceti not monitored spectrum spectrum not monitored not monitored not monitored
L1551-IR spectrum spectrum spectrum not monitored not monitored spectrum
CRL618 not monitored spectrum spectrum not monitored not monitored spectrum
OMC1 spectrum spectrum spectrum spectrum spectrum spectrum
ORION-KL spectrum spectrum spectrum spectrum spectrum spectrum
N2071IR spectrum spectrum spectrum spectrum spectrum spectrum
WB947 not monitored spectrum spectrum not monitored not monitored not monitored
OH231.8 not monitored spectrum spectrum not monitored not monitored spectrum
IRC+10216 not monitored spectrum spectrum not monitored spectrum spectrum
IRAS15194 not monitored spectrum spectrum not monitored not monitored not monitored
IRAS16293 spectrum spectrum spectrum not monitored spectrum spectrum
NGC6334I spectrum spectrum spectrum spectrum spectrum spectrum
M17SW not monitored spectrum spectrum not monitored spectrum spectrum
G34.3 spectrum spectrum spectrum spectrum spectrum spectrum
CRL2688 not monitored spectrum spectrum not monitored spectrum spectrum

APEX-2 (345GHz)

Note: In March 2008, the previous APEX-2A double-sideband receiver has been replaced by the current SHeFI APEX-2 single-sideband receiver. The spectra shown in the following table are averaged from data taken only with this APEX-2 receiver. While for some sources/lines the differences in line shape and calibration are insignificant, for others (e.g. CO(3-2) in ORION-KL) they are obvious. Comparison spectra taken with the old APEX-2A receiver are not available any more on these webpages. They may be available only upon request.

Receiver SHeFI / APEX-2 (345GHz) -- Comparison Spectra
Note - APEX-2 is a single-sideband receiver. For OCS, 13CO(3-2), and CO(3-2) we monitor the line in USB and LSB tunings, i.e. with the receiver tuned to place the line in upper sideband (USB) and in lower sideband (LSB). The spectra in this table show both the results of USB tuning (plotted in blue) and of LSB tuning (in green). Line strengths may be different in the two sidebands.
Species CS SO C18O 13CO CH3OH CS CO HCN HCO+ H2CO
Transition 6-5 8-7 3-2 3-2 70-60A 7-6 3-2 4-3 4-3 505-404
Frequency 293.912 304.070 329.331 330.588 338.405 342.883 345.796 354.505 356.734 362.736
o Ceti not monitored not monitored not monitored spectrum not monitored not monitored spectrum not monitored not monitored not monitored
L1551-IR spectrum not monitored spectrum spectrum not monitored not monitored spectrum not monitored spectrum not monitored
CRL618 not monitored not monitored not monitored spectrum not monitored not monitored spectrum spectrum spectrum not monitored
OMC1 spectrum spectrum spectrum spectrum spectrum spectrum spectrum spectrum spectrum spectrum
ORION-KL spectrum spectrum spectrum spectrum spectrum spectrum spectrum spectrum spectrum spectrum
N2071IR spectrum not monitored spectrum spectrum spectrum spectrum spectrum spectrum spectrum spectrum
WB947 not monitored not monitored not monitored spectrum not monitored not monitored spectrum not monitored not monitored not monitored
OH231.8 not monitored not monitored not monitored spectrum not monitored not monitored spectrum spectrum spectrum not monitored
IRC+10216 spectrum not monitored not monitored spectrum not monitored spectrum spectrum spectrum not monitored not monitored
IRAS15194 not monitored not monitored not monitored spectrum not monitored not monitored spectrum not monitored not monitored not monitored
IRAS16293 spectrum spectrum spectrum spectrum not monitored spectrum spectrum spectrum spectrum spectrum
NGC6334I spectrum not monitored spectrum spectrum spectrum spectrum spectrum spectrum spectrum spectrum
M17SW spectrum spectrum spectrum spectrum not monitored spectrum spectrum not monitored spectrum not monitored
G34.3 spectrum spectrum spectrum spectrum spectrum spectrum spectrum spectrum spectrum spectrum
CRL2688 not monitored not monitored not monitored spectrum not monitored spectrum spectrum spectrum not monitored not monitored

APEX-3 (460GHz)

Receiver SHeFI / APEX-3 (460GHz) -- Comparison Spectra
Note - Depending on atmospheric transmission and instrument characteristics, we observe the various lines with the receiver tuned to place the line in upper sideband (USB) and/or in lower sideband (LSB). The spectra in this table show both the results of USB tuning (plotted in blue) and of LSB tuning (in green). Line strengths may be different in the two sidebands.
Species C34S C18O 13CO H2S CO HDO CS CI
Transition 9-8 4-3 4-3 111-000 4-3 101-000 10-9 3P1-3P0
Frequency 433.751 439.089 440.765 452.390 461.041 464.924 489.751 492.161
o Ceti not monitored not monitored not monitored not monitored spectrum not monitored not monitored not monitored
L1551-IR not monitored not monitored not monitored not monitored spectrum not monitored not monitored not monitored
CRL618 not monitored not monitored not monitored not monitored spectrum not monitored not monitored not monitored
OMC1 not monitored not monitored spectrum spectrum spectrum spectrum spectrum spectrum
ORION-KL not monitored not monitored not monitored not monitored not monitored not monitored not monitored not monitored
N2071IR not monitored not monitored spectrum not monitored spectrum not monitored not monitored not monitored
WB947 not monitored not monitored spectrum not monitored spectrum not monitored not monitored not monitored
OH231.8 not monitored not monitored not monitored not monitored spectrum not monitored not monitored not monitored
IRC+10216 spectrum spectrum spectrum not monitored spectrum not monitored spectrum spectrum
IRAS15194 not monitored not monitored not monitored not monitored spectrum not monitored not monitored not monitored
IRAS16293 not monitored not monitored not monitored not monitored spectrum spectrum spectrum spectrum
NGC6334I not monitored not monitored not monitored not monitored spectrum spectrum spectrum spectrum
M17SW not monitored not monitored not monitored not monitored not monitored not monitored not monitored not monitored
G34.3 not monitored not monitored spectrum not monitored spectrum spectrum spectrum spectrum
CRL2688 not monitored not monitored spectrum not monitored spectrum not monitored spectrum not monitored