HRC PR200L aXe products
To use these calibration products with aXe, copy them into a directory and set your AXE_CONFIG_PATH environment variable to point to that directory.
Important Notes:
- These files are meant to be used together. The sensitivity curve was
derived using observations of two white dwarf standards in a
+/-0.5 arcsec (+/-19 pixels) wide extraction box. Note that the
dispersion of the prism varies with wavelength in a highly
non-linear fashion. The current wavelength calibration is based on
observations
of a planetary nebula and a QSO with lines between 1909Å and
3500Å. The wavelength calibration is estimated to be accurate
to about 0.5 pixels over this range. At longer wavelengths the
reliability decreases rapidly, affecting not only the wavelength scale
but also the flux calibration. Users should also be aware that
red light may scatter from the red to the blue end of the spectrum,
leading to possible systematic errors in the flux calibration for red
objects. This effect is at present poorly quantified.
- The definition of the PR200L aperture was changed on Nov 8th, 2004.
Separate configuration files are available for observations made
before and after this date. The configuration files only differ in the
constant terms in the trace- and wavelength descriptions, i.e. the general
form of these relations is assumed to be unchanged.
- It is very important that aXe v. 1.42 or later be used for the extraction
of prism spectra.
The aXe pages contain the latest version of aXe as well as sample test data and a sample script to perform the extraction
- More details about the PR200L calibrations are available
here
aXe Downloadable files for PR200L
Maintained by Harald Kuntschner <hkuntsch@eso.org>
Last Modified Fri, 20 Mar 2009 17:00:09 +0100
