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lineid - Identify peaks in a spectrum and optionally find lines
lineid
[parameter=value]
lineid identifies peaks in a spectrum, and
attempts to identify spectral lines. The units of the frequency axis will
need to be specified (the default is GHz) in order for the line identification
to work.
Operation can occur in several modes.
1. If the VLSR is given, a LineID is attempted. Either from a given restfreq,
or from a linelist.
2. If the RESTFREQ is given, a VLSR is determined from the frequency of
the fitted peak.
3. If neither is given, just the peak(s) are reported.
See also tablsqfit(1NEMO)
with the option fit=peak, and ccdmom(1NEMO)
has an algorithm to find (properties
of) the Nth peak using mom=3,30,31,32,33,34
More sophisticated algorithms
can be find in for example ADMIT’s LineID task.
The following
parameters are recognized in order; they may be given in any order if the
keyword is also given. Use --help to confirm this man page is up to date.
- in=
- Input (table) file name. No default.
- xcol=
- X coordinate column, representing
the frequency or wavelength axis. Units are GHz, unless specified with the
xunit keyword. [1]
- ycol=
- Y coordinate column, reprepenting an intensity.
[2]
- xunit=
- X axis unit (GHz, MHz, A, nm) -- not implemented yet. [GHz]
- minchan=
- Minimum channels for a peak [3] - not used yet
- maxchan=
- Maximum channels
for a peak [] - not used yet
- vlsr=
- VLSR of object. Not set by default.
- restfreq=
- If line is known, give restfreq in xunits. Not set by default.
- linelist=
- Table with frequencies and lines. Not set by default.
The
following example smoothes a set of random values by 10 channels to create
a handful of peaks and investigates the strongest peak:
tabgen - 115
1 2 123 | tabsmooth - 1 12 10,5| lineid - 0 1
### nemo Debug Info: Peak: 40.1222 0.169591
tabgen - 115 1 2 123 | tabsmooth - 1 12 10,5| lineid - 0 1 vlsr=10000
### nemo Debug Info: Line at 40.1222, Look near freq = 41.5067 for a line
tabgen - 115 1 2 123 | tabsmooth - 1 12 10,5| lineid - 0 1 restfreq=115
### nemo Debug Info: Line at 40.1222 has z=0.651112 or vlsr=...
tablsqfit(1NEMO)
, table(5NEMO)
admit::LineID_AT()
Peter
Teuben
13-dec-2024 0.1 Draft created PJT
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