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Project Charter

Long Description

This project deals with the ingest of FITS data cubes, catalogs, and spectra, and providing access to the products from the archive.  For details of the ALFALFA project see the project web page.

The Arecibo Legacy Fast ALFA (ALFALFA) survey is a completed, blind extragalactic HI survey exploiting Arecibo's superior sensitivity, angular resolution and digital technology to conduct a census of the local HI universe over a cosmologically significant volume. ALFALFA has detected more than 30,000 extragalactic HI line sources out to z~0.06, and its catalog will be especially useful in synergy with wide area surveys conducted at other wavelengths.  The data collection is of great
interest to the radio community and NRAO users.

ALFALFA has produced over 7400 dual polarization data cubes, an ASCII catalog of over 30,000 extragalactic detections, and HI line spectra.

ALFALFA is a completed program.  All data products were processed through IDL.   The ALFALFA project will provide the data cubes in FITS format.

From the SRDP perspective, the set of all ALFALFA data products is a collection.

Publications

The main catalog paper by Haynes et al. (2018).

The long and continually growing list of ALFALFA publications.

ALFALFA Data Products

1. Spectral Data Cubes, Spectral Weights, Continuum Maps, Continuum Weights

Data cube option 1 (Everything in one file - a primary header and three image headers)

Data cube option 2 (Spectral cube and three ancillary products - spectral weights, continuum maps, and continuum weights)

Dimensions of the data

Number of files

Volume of data

2. Extragalactic Catalog

The catalog description, an ASCII text file, or an CSV text file.

3. HI Spectra

Each detection has a single FITS file with a binary table extension, containing the X-Y points of the spectrum and associated metadata.

Stakeholders

Brian Kent, NRAO, Project Sponsor and Technical Expert

Jeff Kern, NRAO, Project Sponsor

Martha Haynes, Cornell, Technical Expert


Requirements

Must haves:


Implementation Plan

Risk Assessment

The ALFALFA data represent a low-risk, completed, and mature dataset that will be useful to the astronomical community.  The data are not going to be remade or regridded, and will be ingested into the archive only one time.

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