Preparation of a run using the TIGER Mode
EXPOSURE SIMULATOR
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First, select the
OASIS SPECTROGRAPH PARAMETERS
you plan to use :
Spatial sampling and field
:
0.09" sampling, 3.7"x3.7" field
0.14" sampling, 4.0"x5.5" field
0.26" sampling, 7.4"x10.3"field
0.42" sampling, 12"x16.7" field
Spectral configuration
:
LR610 : range 4130Å to 8060Å, sampling from 2 to 30Å per pixel
LR951 : range 8650Å to 10370Å, mean sampling 4.5Å per pixel
MR454 : range 4150Å to 4930Å, mean sampling 2Å per pixel
MR516 : range 4760Å to 5560Å, mean sampling 2Å per pixel
MR591 : range 5500Å to 6320Å, mean sampling 2Å per pixel
MR661 : range 6210Å to 7010Å, mean sampling 2Å per pixel
MR735 : range 6940Å to 7760Å, mean sampling 2Å per pixel
MR807 : range 7690Å to 8460Å, mean sampling 2Å per pixel
MR875 : range 8350Å to 9150Å, mean sampling 2Å per pixel
MR952 : range 9150Å to 9900Å, mean sampling 2Å per pixel
HR502 : range 4850Å to 5200Å, mean sampling 1Å per pixel
HR530 : range 5110Å to 5480Å, mean sampling 1Å per pixel
HR638 : range 6210Å to 6550Å, mean sampling 1Å per pixel
HR667 : range 6490Å to 6840Å, mean sampling 1Å per pixel
HR869 : range 8440Å to 8750Å, mean sampling 1Å per pixel
Do you
PLAN TO OBSERVE
:
a
star-like object
(star, star cluster, ...)
, or an
extended object
(galaxy, nebula, ...)
?
For a
star-like object
, what is the
image quality
expected at OASIS input ?
arcsecond
What is the
magnitude
B
V
R
I
,
or
flux
10
-
W m
-2
?
(Å
-1
for continuum, arcsec
-2
for an extended object)
Is the flux dominated by
continuum emission
or
line emission
of rest lambda :
Å, rest
FWHM
:
Å, redshifted to Z =
?
For
LR610 and continuum only
: lambda of interest ?
Å
Give the
OBSERVATIONAL PARAMETERS
:
Exposure zenithal distance
(deg.)
Moon zenithal distance
(deg.)
Moon phase
,
from 0 (new) to 1 (full)
Moon distance
(deg.) from the object
Signal-to-noise ratio
to be achieved
Exposure time
(seconds)
Atmospheric dispersion compensator
: ON
or OFF
(sometimes unwise, see manual)
OPTIONAL PARAMETERS
:
And now
COMPUTE
the :
Exposure time needed
to reach the requested S/N ratio
with the given object flux
Expected S/N ratio
in the given exposure time
with the given object flux
Minimum object flux
to get the requested S/N ratio
in the given exposure time
Back to
OASIS home page
.
Get some
HELP
about this simulator.
Last update: 5 March 2005.
Contact :
A. Pecontal