The flevel (flux level) is multiplied by the mean over the channel range.
Starting at the edges of the range, channels are found where the flux first
rises above the derived level. The integrated flux is taken between these
channels. A linear interpolation is done to find the velocity corresponding
to where the flux equals that level. These two velocities (one at each end)
are used to determine the characteristic velocity (the average of the two).
The velocity width is the absolute value of their difference.
Example
- d.msr().mean(first=324,last=360,flevel=0.2)
[fluxint=99.0127912, vel=1109.67758, vwidth=130.143466, level=0.103916899,
limits=[328 352] , type=mean, mean=0.519584496]
- d.msr().mean(flevel=0.3,usecurs=T)
[fluxint=0.204479891, vel=1111.32345, vwidth=129.747723, level=0.000357433806,
limits=[329.167913 353.229436] , type=mean, mean=0.00119144602]
Arguments
| lv |
|
an SDRecord |
| |
|
Allowed: |
SDRecord - Not enabled |
| |
|
Default: |
F |
| first |
|
first channel number in range to integrate |
| |
|
Allowed: |
integer |
| |
|
Default: |
F |
| last |
|
last channel number in range to integrate |
| |
|
Allowed: |
integer |
| |
|
Default: |
F |
| flevel |
|
fractional flux level |
| |
|
Allowed: |
float |
| |
|
Default: |
0.3 |
| usecurs |
|
optionally set ranges with cursor |
| |
|
Allowed: |
boolean |
| |
|
Default: |
F |
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