The Cornell Digital HI Archive

The Cornell Digital HI Archive hosts the HI line spectra, observed and derived parameters and other ancillary data associated with large galaxy surveys obtained with a number of radio telescopes, especially the 305 meter antenna, the world's largest radio-radar telescope which is located at the Arecibo Observatory, in northern Puerto Rico. The Arecibo Observatory is part of the National Astronomy and Ionosphere which is operated by Cornell University under a cooperative agreement with the National Science Foundation.

This archive is being developed and maintained by members of the Cornell Astronomy ExtraGalactic Group (EGG). It is very much a work in progress. We will continue to add more datasets and more data products as they become available.

If you use the data products presented here, we would appreciate an acknowledgement in any publications which result. Thanks!

Available Datasets:

  • ALFALFA: The Arecibo Legacy Fast Survey

    • Initiated in 2005, the Arecibo Legacy Fast ALFA (ALFALFA) extragalactic HI survey will survey 7000 square degrees of the high galactic latitude sky visible from Arecibo and is expected to detect more than 20,000 galaxies. The ALFALFA team consists of more than 50 scientists and students at 31 institutions in 13 countries. Further details can be found at the ALFALFA web site. Data releases associated with ALFALFA will be provided here over the next years as they become available.

  • ALFALFA Data releases

    • Catalog 3 release is now available!
      Kent et al. 2008, Astron. J., in press     ADS link

    • Catalog 2 release is now available!
      Saintonge et al. 2008, Astron. J., 135, 588     ADS link

    • Catalog 1 release is now available!
      Giovanelli et al. 2007, Astron. J., 133, 2569     ADS link

    • Look here for the results of the precursor observations (to be superceded by the full survey) as presented by Giovanelli et al. 2005, Astro. J., 130, 6     ADS link


  • Pointed observation archive
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  • Archive of pointed observations by the Cornell EGG

    • This dataset currently includes the HI line spectra and derived parameters for 9000 galaxies in the local universe (spanning a heliocentric velocity -200 < V < 28,000 km/s). Obtained over a 25+ year period with a variety of large single dish radio telescopes included in a variety of targeted observing programs, all spectra have been reanalyzed using a single set of parameter extraction algorithms. The database contains catalogs of HI parameters (systemic velocities, integrated HI line fluxes and full widths), plots of the HI spectra, and the digital spectra themselves. Incremental datasets may be added to this collection as they become available. The datasets currently included are:
    • Springob, Haynes, Giovanelli and Kent 2005, ApJS, 160, 149     ADS link
      Main catalog of 8800 pointed observations.

    • Coming soon!     Hogg, Roberts, Haynes and Maddalena 2007, Astro. J. (submitted)    
      High precision GBT observations of 100 relatively isolated objects
          Get Started:

  • SFI++ peculiar velocity catalog

  • SFI++ I-band Catalog of Peculiar Velocities

    • NEW!!     Springob, Masters, Haynes, Giovanelli & Marinoni 2007, Astrophys. J. Suppl. (in press)
      astro-ph/0705.0647 (preprint now available)

      A homogeneously derived catalog of photometric and rotational properties and the Tully-Fisher method distances and peculiar velocities derived from them.