Standard Spectra for the JCMT
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Standard DAS Spectra for the JCMT
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There are a number of molecular species (e.g. CO, HCN) which are
observed frequently enough that they provide a useful means of
monitoring the performance and calibration of our receiver systems. We
have a database of such observations in frequently-observed sources,
and from these we have selected spectra which appear to have
integrated intensities close to the norm. We suggest that all spectral
line observers try to observe at least one such standard line per
night, and compare it with the "standard" in the catalog.
We have a web based interface to all the DAS spectra of
standard sources taken at the JCMT
as well as selected examples presented in the tables below.
Show observational details:
Below are tables for each of our receivers showing "standard" spectra
for those source/line combinations for which data of sufficient
quality exist. In these tables, the most representative "standards"
are identified by  ,
and lower quality
standards by  .
Empty spaces indicate where there are insufficient data, or the lines
are too weak to be used for the purposes of standard spectra. In due
course I would like to replace the empty spaces with "representative
spectra".
To view standard spectra, pick a receiver/frequency:
Recent representative spectra have been made available, for:
To connect to FITS standard spectra database
click here
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B3,
B3i, or
C2
| Receiver A2 -- Spectral Line Standards |
| Species |
|
H2CO |
C18O |
13CO |
CO |
CH3OH |
CS |
HCN |
HCO+ |
| Transition |
303-202 |
2-1 |
2-1 |
2-1 |
50-40A |
5-4 |
3-2 |
3-2 |
| Frequency |
218.222 |
219.560 |
220.398 |
230.538 |
241.791 |
244.935 |
265.886 |
267.557 |
|
| W3(OH) |
|
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| L1551-IRS |
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| CRL618 |
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| OMC1 |
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| N2071IR |
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| OH231.8 |
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| IRC10216 |
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| 16293-2422 |
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| NGC6334I |
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| G34.3 |
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| W75N |
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| CRL2688 |
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| NGC7027 |
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| N7538IRS1 |
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Back to top of page
or to A2,B3i, or C2
Receiver B3 --
Spectral Line Standards
Note: B3 is a dual-channel receiver; i.e. it is capable of observing
line radiation in orthogonal polarizations. B3 spectra are plotted
with channel A shown in green, and channel B in red. Not all
frequencies are necessarily covered by both channels. All spectra shown
have been obtained in single-sideband mode.
|
| Species |
|
C18O |
13CO |
CH3OH |
CS |
CO |
HCN |
HCO+ |
H2CO |
| Transition |
3-2 |
3-2 |
70-60A |
7-6 |
3-2 |
4-3 |
4-3 |
505-404 |
| Frequency |
329.331 |
330.587 |
338.410 |
342.883 |
345.796 |
354.506 |
356.734 |
362.736 |
|
| W3(OH) |
|
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| L1551-IRS |
|
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| CRL618 |
|
|
|
|
|
|
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| OMC1 |
|
|
|
|
|
|
|
|
| N2071IR |
|
|
|
|
|
|
|
|
| OH231.8 |
|
|
|
|
|
|
|
|
| IRC10216 |
|
|
|
|
|
|
|
|
| 16293-2422 |
|
|
|
|
|
|
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| NGC6334I |
|
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| G34.3 |
|
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| W75N |
|
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| CRL2688 |
|
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| NGC7027 |
|
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| N7538IRS1 |
|
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|
Back to top of page
or to A2,B3, or C2
Receiver B3i --
Spectral Line Standards
This receiver has been retired, but the set of "standard" and
"reference spectra has been retained for comparison with B3 data. |
| Species |
|
C18O |
13CO |
CH3OH |
CS |
CO |
HCN |
HCO+ |
H2CO |
| Transition |
3-2 |
3-2 |
70-60A |
7-6 |
3-2 |
4-3 |
4-3 |
505-404 |
| Frequency |
329.331 |
330.587 |
338.410 |
342.883 |
345.796 |
354.506 |
356.734 |
362.736 |
|
| W3(OH) |
|
|
|
|
|
|
|
|
| L1551-IRS |
|
|
|
|
|
|
|
|
| CRL618 |
|
|
|
|
|
|
|
|
| OMC1 |
|
|
|
|
|
|
|
|
| N2071IR |
|
|
|
|
|
|
|
|
| OH231.8 |
|
|
|
|
|
|
|
|
| IRC10216 |
|
|
|
|
|
|
|
|
| 16293-2422 |
|
|
|
|
|
|
|
|
| NGC6334I |
|
|
|
|
|
|
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|
| G34.3 |
|
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|
|
|
|
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| W75N |
|
|
|
|
|
|
|
|
| CRL2688 |
|
|
|
|
|
|
|
|
| NGC7027 |
|
|
|
|
|
|
|
|
| N7538IRS1 |
|
|
|
|
|
|
|
|
Back to top of page
or to A2,B3, or B3i
| Receiver C2 -- Spectral Line Standards |
| Species |
|
CO |
CI |
| Transition |
4-3 |
3P1-3P0 |
| Frequency |
461.041 |
492.167 |
|
| W3(OH) |
|
|
| L1551-IRS |
|
|
| CRL618 |
|
|
| OMC1 |
|
|
| N2071IR |
|
|
| OH231.8 |
|
|
| IRC10216 |
|
|
| 16293-2422 |
|
|
| NGC6334I |
|
|
| G34.3 |
|
|
| W75N |
|
|
| CRL2688 |
|
|
| NGC7027 |
|
|
| N7538IRS1 |
|
|
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A2,
B3,
B3i, or
C2
|
