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Each detection has a single FITS file with a binary table extension, containing the X-Y points of the spectrum and associated metadata.  Number: ~30,000 FITS files.  Total volume: ~ 1 Gigabyte.

Archive Access to ALFALFA Data Products

The modalities for discovery and filtering of ALFALFA data sets in the Archive

End user manipulation

Th expectation is that a user would search for a position on the sky, or via a galaxy name (NED resolver, etc.).     For instance, if one searches on the position 12h20m00s, +09d00m00s, four data cubes, each with three additional ancillary products, would be returned (16 totals hits, total volume would be ~ 1.6 GB). 

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Martha Haynes, Cornell, ALFALFA PI and Technical Expert

Others?

Prerequisites

The ALFALFA project will provide to NRAO the FITS spectral data cubes and ancillary products, data cube index,  extragalactic catalog, and HI spectra FITS files.

Examples will be provided to the SSA team for comments on header metadata, to ease in ingestion.

Requirements

Must haves:

  • Ingest of ALFALFA spectral data cubes and for each cube, three ancillary spectral products (spectral weights, continuum maps, continuum weights)
  • Ingest of the ALFALFA extragalactic catalog
  • Ingest of the ALFALFA spectral line profiles
  • Harvest and persistence of relevant generic and collection specific metadata.
  • Ability to filter on Collection in observation view (both: "must be in" and "must not be in" semantics) in Archive Interface
  • Ability to search on position, data cube name, or object (Cone Search)

Should haves:

  • Search hits should return the data cubes, and any catalog entries and spectra within the search parameters.

Could haves:

  • Search on frequency range?



Implementation Plan

Risk Assessment

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