# DAZLE Calculations and Simulations

## Fraser Clarke

• S:N Calculator
• SPIE Plots
• Other Pages
• Useful documents
• Fabry-Perot Information
• Telescope Information
• Near-IR sky
• DAZLE sensitivity calculations
• ### Notes

• The majority of programs here are written in C and rely heavily on the CPGPLOT library, and my own LIBADA library. You can compile programs by linking to the libraries in my home directory, here are some detailed instructions.
• All the plots in this page are given as gzip'd postscript files
• Unless otherwise stated, the cosmology is assumed to be Lambda-CDM (OM=0.3 OL=0.7 H0=65km/s/Mpc)

## Other Pages

• Internal DAZLE page.
• Public DAZLE page.
• Rob Priddey's feasibility calculations.

## Useful documentation

• JBH's paper on definitions of spectral resolution

## Fabry-Perot Information

The proposal quotes a Finesse of 50. This corresponds to reflectivities (each surface equal) of;
Amplitude = 0.969
Intensity = 0.939
(intensity = amplitude^2).

If the Finesse was to be 100, that would give reflectivities of;
Amplitude = 0.984
Intensity = 0.969

F-P Code

• fp.c : Plots the transmission curve of a Fabry-Perot interferometer.(25/01/2000)
• sepcalc.c : Calculates the plate seperation and order required to observe a given wavelength with a given bandpass (finds closest bandpass possible). (25/01/2000)

## Telescope Information

Telescope Primary Dia. Cass Hole Collecting Area Focus Image Scale
Gemini 8.1m 1.18m 37.59m2 ?? ??
Magellan 6.5m 1.25m 21.55m2 ?? ??

## Near IR sky background

NIR OH line lists

• Merged line list from 0.9-1.4 microns. This is the line list used for most of the calculations.
• The lines used by COHSI (and now CIRPASS).
• A list of lines that are surpressed by CIRPASS. (Same as above, but in a nicer form).
• Near IR (0.9-5µ m) sky background from Gemini page.
• Keck/HIRES sky line atlas. From 5000-10500 angstroms, but doesn't have fluxes (I don't think).

NIR sky code

• plotskylines.c : Plots skylines from a default (or specified) linelist. (22/02/2000)

Plots

• The position and relative strength of emission lines used in calculations (Flux in photons/s/m^2/arcsec^2).
• Estimate of background contribution from emission lines seen by DAZLE over a its range of wavelengths (0.9-1.4 microns).

## DAZLE sensitivity calculations

S:N Spectra - S:N obtained with a 10,000s exposure on Gemini.
• Lyman-alpha with SFR=1Msol/yr. Resolution; 500, 1000, 2000, 4000
• Aminated GIF showing the effect of changing the spectral resolution.
Detectabiliy Spectra - SFR rate that gives S:N=5 in a 10,000s exposure on Gemini.
• Lyman-alpha detected at S:N of 5. Resolution; 500, 1000, 2000, 4000

• Comparison between DAZLE, gaussian and top-hat filters. I've made a close-up version that exagerates the differences.