Diagnostics Diagrams Tools: Ratio-Absolute Diagrams
Specific column density ratios may be used as diagnostic probes
of the ionization state, temperature, and metallicity in radiatively
In the figures generated here (see, for example, figure 10 in
we display "cooling trajectories" for an ionic ratio versus an absolute
column density, for a fixed hydrogen column density
Use the drop-down lists to select the ratio to be displayed along the
y-axis, and the column to be displayed along the x-axis.
Use the buttons on the right to select whether results should be displayed for isochoric or isobaric cooling. Then press "Submit Query". Results would appear in a couple of minutes.
The gas temperature is represented by color
along the curves, from hot (red) to cool (blue).
Panel (a) shows the behavior
for CIE, where we assume Z=1.
Panels (b)-(f) are
for non-equilibrium isochoric cooling, for Z from
10-3 to 2.
Constructed: June 2006, Orly Gnat