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
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!
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
- Catalog 2 release is now available!
Saintonge et al. 2008, Astron. J., 135, 588
- Catalog 1 release is now available!
Giovanelli et al. 2007, Astron. J., 133, 2569
- 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results of the precursor observations (to be superceded by the full survey) as presented by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
| Pointed observation archive||
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
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
| SFI++ peculiar velocity catalog ||
SFI++ I-band Catalog of Peculiar Velocities
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.