COSMOS Version 2.0
Changes
Version 2.0 of COSMOS incorporates a number of changes. The most
important is support for LDSS3 data (and eventually LDSS2 data as
well), but there are a large number of additional changes. Version 2.0
is backwards compatible, in that the version 2 programs will properly
handle files created with version 1.x programs.
Changes visible to the user include:
- Parameter files
- the parameter file directory may now be located anywhere. Its
location is specified by an environment variable COSMOS_PAR_DIR.
- The parameter files
of some programs have changed, with new and renamed parameters.
- map files and dewar
definition files:
- now include several
additional items used by some programs.
- addition of a new
"dewar" SITE2, which describes the IMACS dewar after the change of chip
6 on August 1, 2005.
- adjust-map
- if the order of a
fit is set to a negative number, no correction is made to that fit.
- diagnostic mode in
which fits are plotted.
- fit iterations with
exclusion of outlying points
- defineobs
- new parameter added
to specify instrument
- extract-2dspec
- wavelength limits
default to those defined in map file if set to zero in parameter file
- option of not
subtracting shuffled region in nod&shuffle data
- option of extracting
in logarithmic intervals of wavelength
- interactive fitting for displacement of objects along slits
- map-spectra
- option of mapping alignment holes as well as slits
- name of wavelength limits changed in parameter file to conform
to those used by other programs
- fit orders hard-wired into program rather than user selected
- process-2spec
- prompts for bad pixel file used by Sflats and subsky
- Sflats
- wavelength limits default to
those defined in map file if set to zero in parameter file
- uses standard
dewar-specific and/or optional
user-defined bad pixel map
- cosmic ray rejection
eliminated (promised but never implemented in version 1.x)
- option of generated
shuffled flats for nod&shuffle data
- spectral-lines, spectral-map
- if line list file is a number, it is treated as a single
wavelength line list
- add option of outputing position of object, or positions of slit ends rather than slit
center
- stitch
- new program to combine LDSS3 files in multi-amplifier readout
into one image
- subsky
- wavelength limits default to
those defined in map file if set to zero in parameter file
- add option of
2-dimensional spline fits
- uses standard
dewar-specific and/or optional
user-defined bad pixel map
- add parameter for
ignoring ends of slits
- viewspectra
- additional way to set contrast of spectrum image window
- added button for writing out 1-d spectrum
- options for viewing nod&shuffle data
Several new
programs are on the way:
- A program to generate bad pixel files including areas
contaminated by zero and second order grism spectrra
- A program to allow spectrophotometric calibration of all slits
using observations of a standard star, either through one aperture or
through the center slit
Bug fixes
include:
- error in
map-spectra in calculation of
slit curvature for slits with
off-center objects
- incorrect
handling of ends of slits in subsky
- various minor
bug-fixes
Using
the software
At
the moment,
Version 2.02 of COSMOS is installed Santa Barbara Street, on
pavo and at LCO on llama. Version 1.06 is still available at the usual
location on pavo, as
well as at LCO. Version 2.02 is certain to be rather buggy; please
report all problems to oemler@ociw.edu. Web pages for
the new software can be found at www.ociw.edu/~oemler/COSMOS2/COSMOS.html