MUSE Exposure Time Calculator
Optical AO Integral-Field Spectroscopy Mode Version P115
Description
FAQ
 
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Target Flux Distribution

Target Spatial Distribution:

Infinitely Extended Source
Extended Uniform Source Finite diameter: arcsec (max 30)
Sersic profile
Radius inside which half of the luminosity is :
If below 0".1 , a point source is assumed
arcsec (max 15)
Strength of decrease (0.5 to 10, 4=deVaucouleurs) :
Point Source
 
Distance from target object center at which the S/N or exp.time must be computed: arcsec
Irrelevant for Infinitely Extended Source. For other profiles, distance must be below source radius + 7".5

Target Spectral Distribution and Brightness:

Uniform (constant with wavelength) Target Magnitude and Mag.System:   
= Vega
AB

Magnitudes are given per arcsec2 for extended
sources, and as the integral photometry for
point sources and Sersic profiles.

Magnitudes refer to the redshifted spectrum.
Blackbody: Temperature : K
Template Spectrum: Redshift
z =
Upload Spectrum:
Single Line :
Lambda: nm
Flux: 10-16 erg/s/cm2  (per arcsec2 for extended sources)
FWHM: nm    (minimum 0.25 nm)

Background Source Flux Distribution

expand section...

Background Source Spatial Distribution:

None
Infinitely Extended Source
Extended Uniform Source Finite diameter: arcsec (max 30)
Sersic profile
Radius inside which half of the luminosity is :
If below 0".1, a point source is assumed
arcsec (max 15)
Strength of decrease (0.5 to 10, 4=deVaucouleurs) :
Point Source
 
Distance from background object center at which the S/N or exp.time must be computed: arcsec
Irrelevant for Infinitely Extended Source. For other profiles, distance must be below source radius + 7".5

Background Source Spectral Distribution and Brightness:

Uniform (constant with wavelength) Background Source Magnitude and Mag. System:
= Vega
AB

Magnitudes are given per arcsec2 for extended
sources, and as the integral photometry for
point sources and Sersic profiles.

Magnitudes refer to the redshifted spectrum.
Blackbody: Temperature : K
Template Spectrum: Redshift
z =
Upload Spectrum:
Single Line :
Lambda: nm
Flux:   10-16 erg/s/cm2 (per arcsec2 for extended sources)
FWHM: nm   (minimum 0.25 nm)

Instrument Setup

Instrument Mode:
Number of coadded spatial pixels:
Number of coadded spectral pixels:

Sky Conditions

Moon FLI: Airmass:
Almanac
Time
Time step forward/back


Target
Target coordinates Name or ID:  
α      δ     
UT rise
culm.
set		 Hour Angle azimuth altitude zenith distance airmass FLI moon/sun
phase angle		 moon/target
separation
Target
Moon
Sun
An advanced almanac is available in the ESO SkyCalc sky model calculator
PWV:     mm     Probability % of realising the PWV ≤ 10.00 mm
Seeing/Image Quality:
Turbulence Category:
IQ: arcsec $('#iqComment').html(' FWHM at the airmass and reference wavelength
              The corresponding seeing and turbulence category will be indicated in the output page

Observation Setup

Reference Wavelength: λref= nm. The numeric results will refer to this wavelength.
Wavelength range to plot: λmin= nm         λmax= nm

User provides S/N ratio and NDIT --- ETC returns DIT
User provides S/N ratio and DIT --- ETC returns NDIT
User provides NDIT and DIT --- ETC returns S/N ratio
S/N = NDIT = DIT = s

The total exposure time is the product of DIT (Detector Integration Time) by NDIT (number of DITs). This exposure time does not take into account instrument and telescope overheads.

On submission the model can generate the following:

Plots: Toggle All / No Plots

Peak Pixel values
Target Spectrum, per Spectral Bin Target Spectrum, per Spectral Pixel
Sky Emission per Pixel
Sky Transmission
S/N per Spectral Bin S/N per Pixel
System Efficiency (excl.atmosphere)
Target Input Spectrum in Physical Units
Target Ensquared Energy
Background Object per Spectral Bin Background Object per Spectral Pixel
Background Object Input Spectrum in Physical Units
Background Object Ensquared Energy

FITS files: Toggle All / No FITS files

PSF at the requested image quality and the reference wavelength
Target Object
Target Image: the Target convolved by the PSF
Background Object
Background Object Image: the Background Object convolved by the PSF