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FORS Exposure Time Calculator

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Optical Spectroscopy Mode Version 6.0.1
Description.
F.A.Q
 
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Input Flux Distribution

 Uniform (constant with wavelength)
 Blackbody: T =		 Kelvin
 Template Spectra:	  Redshift Z = 

Object Magnitude:    Band: Vega  AB

Magnitudes are given per square arcsec for extended sources. Note that some template spectra are 
defined over a limited wavelength range and may not allow calculations for all instrument configurations.
The object magnitude is not taken into account for the following single line source. Single line Wavelength: nm Flux: 10-16 ergs/s/cm2 (per arcsec2 for extended sources) FWHM: nm (Minimum value: 0.50) Spatial Distribution: Point Source Extended Source

Sky Conditions

Moon phase: days from new Moon
Airmass:
Seeing: arcsec FWHM in V-band at zenith (use this value in the proposal). The seeing is irrelevant for extended sources.
Probability 60% for a seeing smaller or equal to the requested value
For point sources, the resulting Image Quality FWHM is modeled by the ETC considering the transfer functions of the atmosphere, telescope and instrument. See the helpfile for details.

Instrumental Setup


Resolution:   Standard
              High

Detector:     MIT Red -optimized CCD
              E2V Blue-optimized CCD

             Readout mode: 

Grism:	     

Slit:          arcsec

Polarimetry:  No Polarimetry
              Linear or Circular Polarisation

Results

 S/N:			Value    Plotting range  %
 Exposure Time (s):	Value    Plotting range  %

Plots: Toggle All / No Plots Observed Object+Sky Spectrum Observed Object Spectrum Sky Radiance Spectrum in physical units (ph/s/m2/micron/arcsec2) only with new sky model Observed Sky Spectrum Sky Transmission spectrum only with new sky model Total Efficiency and Wavelength Range Signal-to-noise Input spectrum in physical units 2D simulated image Details of Image Quality Calculations (only for pointsources)
      

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