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The FITS archive & data processing pipelines | ![]() |
| HyperLeda home | Documentation | Search by name | Search near a position | Define a sample | SQL Search | |
| Fits Archive | Structure of HFA | Keywords | FAQ | Introduction | Archived data | Software | Pipeline | |
The archived data are broad band images (BBI) and long-slit spectra (LSS) plus their associated template and calibration files.
The data in HFA can enter into the HyperLeda processing pipeline and the results can be freely downloaded.
The team involved in the project gather:
The idea is to initially restrict the project to an archive of 2 dimensional spectra of galaxies: The pre-PhaseA resulted in:
Definition of the file system (structure of the archive) |
Preliminary definition of the FITS keywords |
Implementation of low-level routines for accessing the archive |
Implementation of the index of the HFA |
The difficulties of defining and maintaining the coordinate systems on a frame come from:
Keywords independent of the processing Unaffected by "linear" processing, like flat-fielding, w-calibration, cosmetic processing, analysis... But possibly affected by "non-linear" processing like combining frames (average flat-field), compositing frames (eg. to remove the cosmics)... | |
---|---|
General Setup Telescope, Instrumental frozen setup, Detector |
Observation Setup Characteristics of the actual observation |
H_DTSET dataset identifier H_CONTXT context: LSS, BBI, ... H_DRON Detector Read out noise, in electrons H_DPIX Detector Pixel size (in microns) Scale (arcsec/pixel) Slit width (arcsec) Dispersion (Angstrom/mm) |
DATE-OBS Date of observation MJD-OBS Date of observation EXPTIME Exposure time AIRMASS Airmass OBJECT Object identifier H_TYPE Type of exposure H_SEEING Seeing PA of the slit |
Keywords affected by the processing | |
General Setup | Observation Setup |
Gain [e/ADU] Saturation level [ADU] Bias [ADU] Flip Rota |
Image size WCS Sky value [ADU] Magnitude calibration constant (mag/arcsec2) PA |
Keywords affected by the processing | |
Related frames Processing History |
HyperLeda | Questions: leda@univ-lyon1.fr |