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 include 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.



NEW: March 2018

The ALFALFA extragalactic HI source catalog is now available. A paper describing it has been submitted for publication and we are pleased to make the catalog available here.

"The Arecibo Legacy Fast ALFA Survey: The ALFALFA Extragalactic HI Source Catalog"
Haynes, M.P., Giovanelli, R., Kent, B.R., Adams, E.A.K., Balonek, T.J., Craig, D.W., Fertig, D., Finn, R., Giovanardi, C., Hallenbeck, G., Hess, K.M., Hoffman, G.L., Huang, S., Jones, M.G., Koopmann, R.A., Kornreich, D.A., Leisman, L., Miller, J., Moorman, C., O'Connor, J., O'Donoghue, A., Papastergis, E., Troischt, P. Stark, D. & Xiao, L. 2018 (submitted)
Paper available after acceptance

Table 2 of the paper by Haynes et al. (2018) presents the ALFALFA catalog of extragalactic HI sources. The user is referred to that paper for a detailed description of the data taking and reduction procedures and for discussion of caveats involved in using this dataset, reviewing and expanding on discussions presented previously in Giovanelli et al. (2005) and Haynes et al. (2011). The values of parameters in Table 2 supercede those presented in earlier data releases. Newly added to this Table are the HI line width at 20% of the peak (W20) and the uncertainties in the distance (sigD) and the logarithm of the HI Mass (sigMHI). The latter are identifical to those used in the paper analyzing the ALFALFA HI mass function (Jones et al. 2018).

References:
Giovanelli et al. 2005, Astron J, 130, 2598;   ADS
Haynes et al. 2018, (submitted; this paper)
Haynes et al. 2011, Astron J, 142, 170;   ADS
Jones et al. 2018, MNRAS in press;   astro-ph/1802.00053

  •   Brief description of contents of ASCII and CSV files. See Haynes et al. (2018) for further details (Haynes et al. 2011 and Jones et al. 2018 also).

  • Catalog of ALFALFA extragalactic HI sources
  • ASCII
  • Catalog of ALFALFA extragalactic HI sources
  • CSV
  • Associated spectra (1 GB gzipped tar)
  • Due to file size, please contact Martha if you need the spectra.




    Older versions are available below but are superceded by the above "α.100" catalog.


    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: Thu Mar 14 09:37:43 EDT 2018 by martha