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The FITS archive & data processing pipelines |
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Introduction
The goal of the
HyperLeda FITS archive
project (HFA) is to gather data (in the
FITS format)
and to document them in a manner that allow an automatic pipeline
processing. On-line pipeline procedures are offered to process these
data
The data presented in HFA are
self-documented thanks to a consistent
set of keywords. These data may be
downloaded as
they are stored, or they may be used to feed a customizable pipeline. The data finally delivered can
hence
be fully calibrated (if desired), some further reduction procedures
(as subtracting the sky, extracting an object ...) may also be applied.
Basic measurements (kinematical profiles, line strengths) may be
performed
along the pipeline.
The HFA has been open in January 1999.
In June it contained about 35000 files.
The archived data are broad band images
(BBI), long-slit spectra
(LSS) and extracted spectra (SPE) plus their associated template and
calibration files.
The team involved in the project
gathers:
- Philippe Prugniel (Observatoire de Lyon)
- Gregory Maubon (Observatoire de Lyon)
- Valeri Golev (University of Sofia)
- Francois Simien (Observatoire de Lyon)
- Roberto Rampazzo (Osservatorio di Brera, Milano)
Details about the present status of the
project may be found in development.html
Data contained in the archive
The archive presently contains both
images and spectra. The data are
stored as
they are provided to HyperLeda, they can be raw data or data at any
stage of
the reduction (if the data are not fully reduced, the necessary
calibration files are provided). The keywords inserted in the FITS
headers allow
an automatic
pipeline processing.
Different subsets of the archive may be
divided as:
- The Library of
Medium Resolution Spectra of
Galaxies (ie. resolution = 1000 to 3000)
The spectra make a complete collection of the observations done with
the
CARELEC spectrograph (OHP) in the frame of the large programs
concerning
the fundamental plane of early-type galaxies and the scaling relations
of spirals (Prugniel, Simien and collaborators).
- Spectrophotometric
resources.
We have included in HFA several spectrophotometric dataset taken from
the literatures: Libraries of stars and spectrophotometric templates
(both stars and galaxies), which can be useful for the study of stellar
populations and for the data calibration (flux calibration).
- The ESO-LV image
catalogue (Lauberts and Valentijn 1989)
These are PDS-scan of regions of photographic plates taken with
the ESO Schmidt telescope around about 15000 galaxies from the ESO
Uppsala
catalogue. These images are flux-calibrated and were used by Lauberts
and Valentijn to measure the parameters published in their catalogue.
The
images included in HyperLeda were copied from ESO.
-
Spectrophotometry
- Compute Evolutive Template Spectra with PEGASE