Infrared Exposure Time Calculator

NACO Exposure Time Calculator

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Infrared Adaptive Optics Spectroscopy Mode Version 3.2.6

Description.

F.A.Q

Performance

Target Input Flux Distribution

Template Spectrum:

Spectral Type : (only JHK)

Target Magnitude : =
Magnitudes are given per square arcsec for extended sources.

Blackbody :

Temperature : K

Single Line :

Lambda:	nm
Flux:	10^-16 ergs/s/cm² (per arcsec² for extended sources)
FWHM:	nm

Spatial Distribution: Point Source Extended Source (per pixel)

Adaptive Optics Mode:

LGS	Laser Guide Star
NGS	Natural Guide Star	Target / Reference Source Separation: arcsecs	Reference Source
			V mag:	Spectral Type

Sky Conditions

Seeing:		arcsecs (FWHM in V band, at Zenith).
Airmass:

Instrument Setup

NAOS WFS/Dichroic:

Dichroic Name	Reflected light to the WFS (Efficiency)	Transmitted light to CONICA (Efficiency)	Conditions of use
VIS	V,R,I [0.45 - 0.95] microns (90%)	J,H,K,L,M [1.05 - 5.0] microns (90%)	Near-IR observations with optical WF sensing
N20C80	V,R,I,J,K [0.45 - 2.55] microns (20%)	V,R,I,J,H,K [1.05 - 5.0] microns (80%)	WF sensing and observing in the IR
N90C10	V,R,I,J,K [0.45 - 2.55] microns (90%)	V,R,I,J,H,K [1.05 - 5.0] microns (10%)	WF sensing and observing in the IR
JHK	I,J,H,K [0.8 - 2.55] microns (90%)	L,M [2.8 - 5.5] microns (90%)	Thermal-IR observations with WF sensing in the near-IR
K	K [1.9 - 2.55] microns (90%)	J,H [0.45 - 1.8] microns (90%)	V,R,I,J,H observations with WF sensing in K
FREE	The NAOS-PS will try to find an optimal Dicroic/WFS combination. Note

slit:

Grism/Filter Mode:

Instrument mode :

(select Double_RdRstRd for LW).

Results

S/N ratio:	S/N =	DIT = sec	Please note the relevant minimum DIT* in the manual.*
Exposure Time:	NDIT =

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 graphs:
(input parameters are replicated in the output page)

Resultant spectrum including sky

Object Spectrum only

Sky Emission Spectrum

Sky Transmission Spectrum

S/N as a function of wavelength

Total Efficiency and Wavelength Range

Input spectrum in physical units

Line Spread Function (point source only)

Enslitted Energy (point source only)