The HI Parkes All Sky Survey

Data Access Site

Welcome to the HI Parkes All Sky Survey data access page. A number of HIPASS data products are available and can be found further down this page, together with abstracts from and links to the relevant HIPASS data papers.

The web page for the Multibeam survey collaboration can be found here.

Further resources available here include various pictures, front and back pages of the HIPASS Catalogue brochure, and a spinning view of the HIPASS Catalogue in mpeg format.

Paper I (Meyer et al.)
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Paper II (Zwaan et al.)
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NHICAT paper (Wong et al.)
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The HIPASS catalogue: I. - Data presentation

Meyer, M.J., Zwaan, M.A., Webster, R.L., et al.

2004, MNRAS, 350, 1195-1209

The HI Parkes All-Sky Survey (HIPASS) Catalogue forms the largest uniform catalogue of HI sources compiled to date, with 4,315 sources identified purely by their HI content. The catalogue data comprise the southern region Dec < +2 degrees of HIPASS, the first blind HI survey to cover the entire southern sky. RMS noise for this survey is 13 mJy beam-1 and the velocity range is -1,280 to 12,700 km s-1. Data search, verification and parametrization methods are discussed along with a description of measured quantities. Full catalogue data is made available to the astronomical community including positions, velocities, velocity widths, integrated fluxes and peak flux densities. Also available are on-sky moment maps, position-velocity moment maps and spectra of catalogue sources. A number of local large-scale features are observed in the space distribution of sources including the Super-Galactic Plane and the Local Void. Notably, large-scale structure is seen at low Galactic latitudes, a region normally obscured at optical wavelengths.

Additional references:
1) The HIPASS catalogue: II. - Completeness, reliability and parameter accuracy, Zwaan et al., 2004, MNRAS, 350, 1210-1219.
2) The Northern HIPASS catalogue - Data presentation, completeness and reliability measures, Wong et al., 2006, MNRAS, 371, 1855.

Paper III (Doyle et al.)
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Table : HOPCAT (ascii)

The HIPASS catalogue: III. - Optical counterparts & isolated dark galaxies

Doyle, M.T., Drinkwater, M.J., Rohde, D.J., et al.

2005, MNRAS, 361, 34-44

We present the largest catalogue to date of optical counterparts for HI radio-selected galaxies, HOPCAT. Of the 4315 HI radio-detected sources from the HI Parkes All Sky Survey (HIPASS) catalogue, we find optical counterparts for 3618 (84%) galaxies. Of these, 1798 (42%) have confirmed optical velocities and 848 (20%) are single matches without confirmed velocities. Some galaxy matches are members of galaxy groups. From these multiple galaxy matches, 714 (16%) have confirmed optical velocities and a further 258 (6%) galaxies are without confirmed velocities. For 481 (11%), multiple galaxies are present but no single optical counterpart can be chosen and 216 (5%) have no obvious optical galaxy present. Most of these `blank fields' are in crowded fields along the Galactic plane or have high extinctions.

Isolated `Dark galaxy' candidates are investigated using an extinction cut of ABj < 1 mag and the blank fields category. Of the 3692 galaxies with an ABj extinction < 1 mag, only 13 are also blank fields. Of these, 12 are eliminated either with follow-up Parkes observations or are in crowded fields. The remaining one has a low surface brightness optical counterpart. Hence, no isolated optically dark galaxies have been found within the limits of the HIPASS survey.

NOIRCAT paper (Wong et al.)


NOIRCAT - The Northern HIPASS Optical/IR Catalogue

Wong, O.I., Webster, R.L., Kilborn, V., Waugh, M., Staveley-Smith, L.

2009, in press in MNRAS

We present the Northern HIPASS Optical/InfraRed CATalogue (NOIRCAT), an optical/near-infrared counterpart to the Northern HIPASS catalogue (NHICAT). Of the 1002 sources in NHICAT, 655 (66%) have optical counterparts with matching optical velocities. A further 85 (8%) sources have optical counterparts with matching velocities from previous radio emission-line surveys. We find a correlation between the gas and stellar content of the NOIRCAT sources. Our HI-selected sample of isolated galaxies also present a wider range in near-infrared (NIR) colours than previous optically-selected studies of regular, isolated galaxies. All HI detections in optically unobscured fields could be matched with either a NED optical counterpart, or a galaxy visible in POSSII or DSS images. However, as over 200 of these matched galaxies have no velocity information, further follow-up observations are needed to confirm the matches, and hence confirm or deny the existence of dark galaxies in this dataset.

Paper (Putman et al.)

Table 1 HVCs (ascii)

Table 3 XHVCs (ascii)

HIPASS High-Velocity Clouds: Properties of the Compact and Extended Populations

Putman, M.E., de Heij, V., Staveley-Smith, L., et al.

2002, AJ, 123, 873-891

A catalog of southern anomalous-velocity HI clouds at decl. < +2 deg is presented. This catalog is based on data from the HI Parkes All-Sky Survey (HIPASS) reprocessed with the MINMED5 procedure and searched with a new high-velocity cloud-finding algorithm. The improved sensitivity (5-sigma TB = 0.04 K), resolution (15.5 arcmin), and velocity range (-500 km s-1 < VLSR < +500 km s-1) of the HIPASS data result in a substantial increase in the number of individual clouds (1956, as well as 41 galaxies) compared with what was known from earlier southern data. The method of cataloging the anomalous-velocity objects is described, and a catalog of key cloud parameters, including velocity, angular size, peak column density, total flux, position angle, and degree of isolation, is presented. The data are characterized into several classes of anomalous-velocity HI emission. Most high-velocity emission features are HVCs and have a filamentary morphology and are loosely organized into large complexes extending over tens of degrees. In addition, 179 compact and isolated anomalous-velocity objects, CHVCs, are identified based on their size and degree of isolation. Of the CHVCs originally classified by Braun & Burton, 25% are reclassified based on the HIPASS data. The properties of all the high-velocity emission features and only the CHVCs are investigated, and distinct similarities and differences are found. Both populations have typical HI masses of ~4.5D2kpc Msol and have similar slopes for their column density and flux distributions. On the other hand, the CHVCs appear to be clustered and the population can be broken up into three spatially distinct groups, while the entire population of clouds is more uniformly distributed with a significant percentage aligned with the Magellanic Stream. The median velocities are VGSR=-38 km s-1 for the CHVCs and -30 km s-1 for all the anomalous-velocity clouds. Based on the catalog sizes, high-velocity features cover 19% of the southern sky,and CHVCs cover 1%.

Paper (Barnes et al.)
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HIPASS May 2000 data release

The HI Parkes All Sky Survey: southern observations, calibration and robust imaging

Barnes, D.G., Staveley-Smith, L., de Blok, W.J.G., et al.

2001, MNRAS, 322, 486-498

The acquisition of HI Parkes All Sky Survey (HIPASS) southern sky data commenced at the Australia Telescope National Facility's Parkes 64-m telescope in 1997 February, and was completed in 2000 March. HIPASS is the deepest HI survey yet of the sky south of declination +2°, and is sensitive to emission out to 170 h75-1 Mpc. The characteristic root mean square noise in the survey images is 13.3 mJy. This paper describes the survey observations, which comprise 23020 eight-degree scans of 9-min duration, and details the techniques used to calibrate and image the data. The processing algorithms are successfully designed to be statistically robust to the presence of interference signals, and are particular to imaging point (or nearly point) sources. Specifically, a major improvement in image quality is obtained by designing a median-gridding algorithm which uses the median estimator in place of the mean estimator.

HIPASS data was acquired with the Parkes 64-m Radiotelescope, operated as a national facility by the CSIRO's Australia Telescope National Facility. The Multibeam Survey Working Group home page provides more information, including links to papers published by members of the team.

(*) MNRAS copyright note: This is an electronic version of an article published in Monthly Notices of the Royal Astronomical Society: complete citation information for the final version of the paper, as published in the print edition of Monthly Notices of the Royal Astronomical Society, is available on the Blackwell Science Synergy online delivery service, accessible via the journal's Website at:

(^) The Astronomical Journalcopyright note: This is an electronic version of an article published in The Astronomical Journal: complete citation information for the final version of the paper, as published in the print edition of The Astronomical Journal, is available from the University of Chicago Press, Journals Division, accessible via the journal's Website at:

These pages were developed by David Barnes from the University of Melbourne, and are hosted by the ANU Supercomputer Facility.