Background
The LVM (Long Variable Multislit) slitmask is a commonly-used
DEIMOS mask which features several longslits of varying width on
a shiny surface, thus improving the visibility of faint targets
in the vicinity of the slit. By offering numerous slit width
options this mask can replace several longslit masks, allowing
room for more observer masks while retaining the ability to use
the apprpriate slit width for the current observing conditions
and target.
Slit Layout
Slit Width
[arcsec] |
Slit Length
[arcsec] |
Slit Location |
| Guider |
Image |
| 0.7 |
20 |
Rightmost |
Leftmost |
| 0.8 |
20 |
2nd from Right |
2nd from Left |
| 1.0 |
20 |
Middle |
Middle |
| 1.2 |
20 |
2nd from Left |
2nd from Right |
| 1.5 |
20 |
Leftmost |
Rightmost |
Guider Image
The following image shows the appearance of the slits on the
DEIMOS guider.
See Also