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Spectral Line Selection Tool
The ALMA spectral line catalogue contains the rest frequencies ofmillions of spectral line transitions that can be inspected andselected using this spectral selection tool. The tool can be launchedwith the buttons
Select Lines to Observe...
and
Select Lines to Overlay...
when defining the Spectral Setup in a ScienceGoal or via the button
Line Catalogue
within an SB.
On the left of the tool are a large number of filters that allow youto place various constraints on the spectral line search. The linesthat satisfy those constraints are shown in the main panel to theright of the filter selection panel. If the tool has been launchedfrom a Science Goal, lines can be selected and placed into a panelbelow this. When the tool is closed these lines will be entered intothe Science Goal's spectral window table. Please note that lines canbe selected and de-selected by double clicking on them.
-
Filter/Species
: Text string for selecting the transitions from the
Transition
column in the database. A checkbox allows you to select on the textual description of the transition. This is set by default.
-
ALMA Band
: A range of ALMA bands can be selected which in turn sets the sky frequency.
-
Sky Frequency
: The frequency range within which to search can be set here - this choice is also reflected in the
ALMA Band
selector and the
Min
and
Max
fields. The latter can be used to enter very precise values.
-
Sideband filter
: If a line has been selected and this filtering is enabled, the list of available lines will change to reflect what is now possible given the constraints on the positions of the sidebands. This is an experimental and thus optional filter. The default behaviour is for this to be enabled when selecting lines and disabled when overlaying.
-
Maximum Upper-state Energy
: This filter sets the maximum energy level of the upper state of the transition and can be used to narrow the selection of lines.
-
Molecule Filter/Enviroment
: Narrow the candidate molecular transitions by selecting the category of line to be shown.
-
Reset Filters
: Reset the filters to the default values.
-
Search Online
: Use the selection criteria to do a search in the online catalogues. The online search is only enabled when a species is selected and one ALMA Band is selected.
The list of available transitions can also be sortedby column by clicking on the column title. A double click will causethat column to be the main sort column - an arrow will appear tosignal this. Subsequent clicks will reverse the order of sorting -the direction of the arrow will reverse. A secondary sort column canbe defined by single-clicking on a different column's title - theorder of this can also be reversed. The default sorting options are by
Rest Frequency
(primary sort) and by
Transition
(secondarysort).
Next:
The Phase 1 Proposal
Up:
Tools and Simulators
Previous:
Feedback panel
Contents
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The ALMA OT Team, 2011 May 20