A general description of GILDAS can be found in the quick INTRODUCTION to GILDAS
(pdf). GILDAS is composed of:
- A kernel:
- a command line interpreter with mathematical possibilities and direct
access to internal and FITS data formats; SIC also includes a built-in GUI
(Graphical User Interface) constructor; (pdf)
- an all-purpose 1-D, 2-D and almost 3-D graphical program. GREG has
many facilities for astronomical data manipulation and analysis; (pdf)
- a Gildas-Python binding is provided to the users who want to
benefit the functionalities of both Gildas programs and Python in a single
program session (pdf)
- Interactive programs:
- General purpose:
- dedicated to ephemeris and observation preparation (e.g. NOEMA
correlator setup); (pdf)
- a library dedicated to the calibration of the telescope (pointing,
focus, gain, ...); (pdf)
- Single-dish data processing:
- New software dedicated to the calibration of the raw format
(IMBFITS) and the writing in the CLASS data format of 30M spectra:
user and programmer manuals;
- Former software dedicated to the calibration of the raw format
(IMBFITS) and the writing in the CLASS data format of 30M spectra
obtained in 2006 and after (pdf); MIRA will only be supported for
typically one more year; the software to calibrate 30M spectra before
that date (OTFCAL) is not supported anymore;
- dedicated to the processing of single–dish spectra; CLASS (pdf)
is oriented towards the processing of a large quantity of spectra (see
IRAM memo 2005-1); WEEDS (pdf) is an extension of CLASS based
on the GILDAS-PYTHON binding; it accesses online spectral catalogs
to ease the analysis of spectral surveys or spectral lines observations
with large bandwidths; demonstration data and scripts are available.
- though not belonging to the GILDAS distribution, is the
recommended package to reduce bolometric data from the 30M
telescope (contact: firstname.lastname@example.org); NIC is obsolete, i.e. it is not
distributed anymore with GILDAS;
- dedicated to calibration of 30M On–The–Fly data obtained
before 2006; for later data, users should use MIRA; (pdf)
- Interferometer data processing:
- dedicated to on-line and off-line calibration of NOEMA; (pdf)
- dedicated to imaging and deconvolution of aperture synthesis
data (pdf); MAPPING also includes an ALMA simulator;
- Standalone tasks: Dedicated small programs to perform non interactive, time
consuming processing such as transposition, fitting, reprojection, image processing,
The programming manual gives all information required to develop new applications in
GILDAS. It describes i) how to use the SIC command line monitor and the GREG graphical
library, and ii) how to implement new GILDAS tasks.
The ALMA simulator has been created to evaluate the importance of the ALMA Compact
Array (ACA) on the wide field imaging performances of ALMA. All information about the
simulator may be found in the following ALMA memos:
- # 488: Wide use of the simulator by our japonese colleagues to help designing ACA;
- # 398: The most up-to-date description of the simulator and final results;
- # 387: Preliminary results;
- # 386: First state of the simulator.
NOEMA additional information
- (An Introduction to the IRAM NOEMA interferometer) is a description
of the IRAM NOrthen Extented Milliter Array. This is a must for the
astronomers preparing observing proposals.
- (The Correlator Manual) describes the possibilities of the correlator.
- (Frequency Setup) contains an accurate description of the frequency
plan of the IRAM interferometer. This is useful when double sideband
observations of narrow lines have to be planned.
- (Amplitude Calibration) describes the primary amplitude calibration:
atmospheric calibration receiver and telescope dependent parameters. This
document also applies for the 30-m calibration.
- (Interferometer Observer’s Manual) a complete observing manual for the
- (Flux measurements) details the observing techniques for flux density
- (Pointing User’s Guide) details the methods for pointing measurements and
describes the POINT program.
- (Trouble Shooting Guide) contains a (non-exhaustive) list of potential
problems, with their causes and a description of diagnostic tools.
- (Calibration CookBook), a supplement to the CLIC manual, contains
simple recipes to calibrate interferometer data.
NIC memos (for reference, even though NIC is now obsolete)
Description of the raw data format