SCRIPT AND MOLECULAR NAME TAGS

The way of interactively selecting molecular species appears to be instructive but tedious. Users might like to use a script or typing a group of the selected inputs in a shell environment to run smauvspec. Here are a few steps for this approach:

1. Edit the script

First, we edit the script file jpllines.csh

#!/bin/csh -f
#identiy spectral line using JPL catalog
#
smauvspec vis=SgrB2_M.H2CO hann=3 strngl=-3.5 \
        interval=1000 catpath=$MIRCAT/jplcat/  \
        options=jplcat,restfreq,nobase,avall \
        lsrvel=61 veltype=lsr veldef=radio \
        axis=freq,amp device=/xs nxy=1,1
exit

The setup is similar to the previous case. Alternatively, in this case, we select more molecules and set the molecular strength ${\it strngl=-3.5}$ instead of the default value ( ${\it strngl=-500}$). We require to average all the baselines and plot the amplitude in a single spectrum (options=nobase,avall and axis=freq,amp).

2. Select the molecules in the tag file

Then, we mark the relevant molecules in the tag file (moltag.txt) by replacing 'n' with 'y' in the first column. The second column is the molecular tag number and the third column is the name of the molecules. A template of moltag.txt can be found from the web (a molecular name tag file for JPL catalog.)

n----1001----H-atom
n----2001----D-atom
n----3001----HD
n----4001----H2D+
n----7001----Li-6-H
n----8001----LiH
n----8002----Li-6-D
n----9001----LiD
n---12001----C-atom
n---13001----C-13-atom
n---13002----CH
n---13003----CH+
n---14001----N-atom
n---14002----N-atom-D-st
n---15001----NH
n---16001----O-atom
n---17001----OH
n---17002----NH3
n---17003----CH3D
n---17004----NH3-v2
...
y---30004----H2CO
...
y---32003----CH3OH
...
y---43002----HNCO
...
y---51001----HCCCN
...
y---60001----OCS
...
n---97003----Br-81-O(v=1)
n---98001----H2SO4
n---98002----HOBr-81
n---99001----Cl-37-ONO2
n---99002----HC7N
n--100001----C7O
n--102001----ClOOCl
n--104001----Cl-37-OOCl
n--111001----OBr-79-O
n--112001----Se-80-O2
n--112002----C8O
n--113001----OBr-81-O
n--123001----HC9N
n--124001----C9O
n--147001----HC11N

We have selected five molecules (${\rm H_2CO}$, ${\rm CH_3OH}$, ${\rm HNCO}$, ${\rm HCCCN}$ and ${\rm OCS}$) for identifications of the spectral lines.

3. Execute the script

We now submit the script with the input from moltag.txt

jpllines.csh < moltag.txt

Figure: The spectrum of SgrB2(M) is shifted to the rest frame along with the identifications of the transitions from the molecular species ${\rm H_2CO}$, ${\rm CH_3OH}$, ${\rm HNCO}$, ${\rm HCCCN}$ and ${\rm OCS}$.