grating mode is used with the FUV-MAMA
, has a resolving power R~1000, and covers a spectral range from 1150 to 1700 Å in a single exposure.
Notice, that with two observations, one with G140L
and one with G230L
, the full spectral region, from 1150 to 3100 Å can be efficiently observed at an R~1000.
grating mode is designed for observations where high spectral resolution is not required, but efficient, spatially resolved spectroscopy providing wide spectral coverage in the UV is desired.
The top axis displays constant Fλ
values corresponding to the STMAG units (V+STMAGλ
) on the bottom axis. Recall that STMAG=0 is equivalent to Fλ
= 3.63E-9 erg/cm2
/s/Å. The curves are labeled with exposure times in seconds.