paranal_transmission: EAZY Paranal Sky Transmission

In asgr/ProSpect: Professional Spectral Analysis Package

EAZY Paranal Sky Transmission

Description

Paranal sky transmission curve that comes with EAZY as downloaded on 20/11/2018.

Usage

data("paranal_transmission")

Format

A data frame with 11514 observations on the following 2 variables.

wave

a numeric vector, wavelength in Angstroms

response

a numeric vector, the relative response

Details

Settings used:

Altitude : 65.38
Airmass : 1.10

Season : Entire Year
Time Period : Entire Night

PWV : Seasonal Average
Monthly Averaged Solar Flux : 130.00 s.f.u

Components included in the radiance model:

Scattered Moon Light: separation of Sun and Moon : 90.00 degrees
separation of Moon and object : 45.00 degrees
altitude of Moon above horizon : 45.00 degrees
distance to Moon : 1.0000

Star Light

Zodiacal Light: ecliptic longitude of object : 135.00 degrees
ecliptic latiude of object : 90.00 degrees

Molecular Emission of Lower Atmosphere
Emission Lines of Upper Atmosphere
Airglow Continuum

Wavelength grid:
Range: 300.00 nm - 3000.00 nm
Fixed spectral resolution R=5000

LSF convolution kernel: none

Source

The new web site to get such curves appears to be:

https://www.eso.org/observing/etc/bin/gen/form?INS.MODE=swspectr+INS.NAME=SKYCALC

References

Brammer, van Dokkum & Coppi, 2008, ApJ, 686, 1503

Examples

data(paranal_transmission)
plot(paranal_transmission, type = 'l', xlab = 'Wave / Ang', ylab = 'Transmission')

# Use on a filter:
paranal_func=approxfun(paranal_transmission)

SDSS_u=EAZY_filters$filters[[73]]
plot(SDSS_u, type='l')

SDSS_u_sky=cbind(wave=SDSS_u[,1],response=SDSS_u[,2]*paranal_func(SDSS_u[,1]))
lines(SDSS_u_sky, lty=2)

asgr/ProSpect documentation built on June 15, 2025, 5:25 a.m.