The resolving power is specified to be larger than:
UVB
The resolving power is monitored via arc lamp through slit spectra using
the 1.0 arcsec slit and with the IFU. For transforming the specification
for the 1.0'' slit to the 0.4'' slit, we model the observed relation
of resolving power = f(slit_width) by polynomial of order 3. Since the
observed resolving power at 1.0'' ist 5390 (better than the specification
5000) we simply multiply the polynomial by 5000/5390 (neglecting higher
correction orders) to obtain a relation for the specification (the dashed
line in the daily plot). From this relation we obtain a specification
for 0.5''.
VIS
The resolving power is monitored via arc lamp through slit spectra using the 0.9 arcsec slit
and with the IFU. From the observed VIS-arm resolution versus slit width relation,
is expressed by a polynomial and
a correction factor of 0.952 can be estimated to express the reference value
(Reference Resolving Power = 7500 at 1.0 arcsec) for the 0.9 arcsec slit: 7880
NIR
The resolving power is monitored via arc lamp through slit spectra using the 0.9 arcsec slit
and with the IFU. From the NIR-arm resolution versus slit width relation,
a correction factor of 0.938 can be estimated to express the reference value
(Reference Resolving Power = 4800 at 1.0 arcsec) for the 0.9 arcsec slit: 5120
Since the instrumental profile is narrower than the 0.9 and 1.0 arcsec slit, we monitor in the right box the best achievable resolving power using the most narrow slit.
For more information see the plot tutorial page.