ALFALFA

The Arecibo Legacy Fast ALFA Survey


Data Archive

The full ALFALFA dataset consists of Level 0, 1 and 2 datasets. The raw data (Level 0) are archived at Arecibo. The Level 1 (calibrated, bandpass subtracted and RFI flagged) drift scans and Level 2 (fully processed) data cubes are archived both at Cornell and at Arecibo. The final data products including source catalogs with identified optical counterparts. After publication, ALFALFA data and spectra are incorporated into the NASA Extragalactic Database; to find what's there, just follow this link. Here, we also post catalogs in advance of publication as they become usable.



First-release version α.100 "A grids" data files

Below is the datafile, in ASCII and CSV formats, containint the 100% ALFALFA catalog over the lowest velocity quadrant (cz < 3200 km/s), along with a file explaining its contents. Users are strongly urged to read all the details/disclaimers in the α40 paper. This dataset is not fully vetted, but is usable with minor caution.
  • Catalog of ALFALFA "A" grids HI detections
  • ASCII
  • Catalog of ALFALFA "A" grids HI detections
  • CSV
  • Explanatory notes for ALFALFA "A" grids
  • README file



    α.70 data files

    Below is the datafile, in ASCII and CSV formats, containing the 70% ALFALFA catalog α.70, along with a file explaining its contents. Users are strongly urged to read all the details/disclaimers in the α40 paper.
  • Catalog of α.70 HI detections
  • ASCII
  • Catalog of α.70 HI detections
  • CSV
  • Explanatory notes for α.70
  • README file



    α.40 data files (Haynes et al. 2011, AJ 142, 170)

    The datafiles associated with Tables 1, 2 and 3 of Haynes et al. 2011 (AJ 142, 170; ADS link) containing the results of the 40% ALFALFA survey, also known as α.40, can be downloaded here. Users are strongly urged to read all the details/disclaimers in the paper. (Radio spectroscopy is fun, but it is not easy!)

  • Table 1: Properties of α.40 HI detections
  • ASCII CSV
  • Table 2: Comments on Individual α.40 Sources
  • ASCII CSV
  • Table 3: ALFALFA-SDSS DR7 α.40 Cross-reference
  • ASCII CSV



    Digital HI Spectra Access Links

    The ALFALFA spectra (as well as nearly all of the older, targeted HI line spectra collected by us between 1981 and 2005) are available through the NASA Extragalactic Database, on its digital spectral search page. You can access the HI digital spectra via NED as follows: See the ALFALFA publications page for details.




    Last modified: Fri Jun 24 14:21:45 EDT 2016 by martha