|Scanamorphos is an IDL software developed
to build maps from scan observations made with bolometer
arrays or other instruments subject to low-frequency
, in particular with the PACS and SPIRE
photometers onboard the Herschel
space telescope (wavelength range of operation: 70 to 500
µm). It has now been adapted to other far-infrared and
millimeter instruments, ground-based or balloon-borne.
Here are the main functionalities for ArTéMiS:
- subtraction of linear baselines (brightness drifts
with timescales larger than the scan leg duration)
- subtraction of the average brightness drift (i.e.
atmosphere + correlated instrumental drift), on
timescales smaller than the scan leg duration
- subtraction of the individual brightness drift of each
bolometer (i.e. flicker noise), also on timescales
smaller than the scan leg duration
- detection and masking of glitches
- projection of signal, error, drifts and weight maps on
a spatial grid specified by the user, assuming
The processing is fully
automated, but ample visualization of intermediate results
at various steps is enabled.
You will need the ArTéMiS pipeline for the calibration and
opacity correction, and to reinject the processed data
into the original data structures for further use.
tree is available already grafted onto the pipeline, with
word composed of "scan" and "anamorphosis"
anamorphosis: reversible transformation of
an image by a mathematical or optical operator
Greek , implying the idea of a
transposition or return; and : shape)
2013, PASP 125, 1126
It contains a detailed description of the algorithm
for Herschel, illustrations of the various
processing steps drawn from SDP (Science
Demonstration Phase) data, and the results of two
The user guide for ArTéMiS is available on arXiv:1803.04264
and should also be cited.
It is also provided here as a pdf file:
distributed under the terms of the GNU General
Public License. You will need recent versions of IDL
and the IDL
You will also need to install the ArTéMiS
pipeline, in charge of the initial formatting,
calibration and opacity correction, and optionally
the final projection. Scanamorphos
routines are separately available here for
convenience (to allow decoupled releases).
Unpack the software archive below in the pipeline
subdirectory named apexpro/ . This will create
or update a subdirectory named SCANAM_ARTEMIS/ .
Then add the following routine in the same
subdirectory apexpro/ :
(courtesy Frédéric Schuller)
For the processing, follow the instructions
contained in the user guide.
reports, suggestions for improvements or new
have questions or comments about any aspect of Scanamorphos,
please contact me by electronic mail (roussel at iap
dot fr). If you wish to be notified of updates,
simply include "register scanam_artemis" in the
is distributed to the astronomical community in the
hope that it will be useful. But since the software
could not be tested in any possible configuration,
you may encounter bugs now and then. In this event,
please give me a precise account (with the inputs
and full error message), so that they can be fixed
in patches and future releases.
work benefited from working within the Herschel,
and ArTéMiS teams, whose members are collectively