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JCMT HARP ACSIS Standard Spectra
JCMT HARP ACSIS Standard Spectra
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JCMT HARP ACSIS Standard Spectra
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The table below contains the average spectra of all good quality observations
obtained between April 2007 and October 2010 (the 2007 spectra are in the
list of current cals).
Good quality means line temperatures which are internally consistent and also
consistent with RxB3/DAS data (if existing), and with good baselines.
For some source/frequencies (HII regions in 13CO and CO) the scatter in
individual observations is larger than for others, probably due to pointing
errors caused by the fact that the K-mirror is not at the same position during
the pointing and the science observation. This will be investigated when we
have time.
The spectra were added with ORACDR (using the narrowline or broadline advanced
recipe (no line forest recipe is available yet)).
In both recipes a first order baseline is subtracted.
For the
moment only 250 and 1000 MHz bandwidth spectra were summed (resolution 30 and
488 kHz). The
numbers in brackets are the peak TA* (when necessary
after rebinning) and the number of good observations existing for the
particular combination.
For C18O and 13CO 250 MHz observations were
added where these lines were observed in two subband mode (resolution 60 kHz).
These are distinguished by an s.
All spectra show identifications of lines in the band. The identified lines
are those which are listed in JCMTOT (and therefore in SPLAT).
The sdf files with the spectra are available on request.
Note that HARP standard observations (and therefore all HARP observations) made before 20090521 are less reliable than those after that date because of a
change in the pointing method - see here.
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