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HyperLEDA documentation: FITS archive

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.
CCD images of galaxies
Broad band in U B V R and I

Spectrophotometry

Compute Evolutive Template Spectra with PEGASE

HyperLeda

Questions: leda@univ-lyon1.fr