The HIPASS catalogue - II. Completeness, reliability and parameter accuracy

Abstract

The H I Parkes All Sky Survey (HIPASS) is a blind extragalactic H I 21-cm emission-line survey covering the whole southern sky from declination −90 • to +25 • . The HIPASS catalogue (HICAT), containing 4315 H I-selected galaxies from the region south of declination +2 • , is presented in Meyer et al. (Paper I). This paper describes in detail the completeness and reliability of HICAT, which are calculated from the recovery rate of synthetic sources and follow-up observations, respectively. HICAT is found to be 99 per cent complete at a peak flux of 84 mJy and an integrated flux of 9.4 Jy km s −1 . The overall reliability is 95 per cent, but rises to 99 per cent for sources with peak fluxes >58 mJy or integrated flux >8.2 Jy km s −1 . Expressions are derived for the uncertainties on the most important HICAT parameters: peak flux, integrated flux, velocity width and recessional velocity. The errors on HICAT parameters are dominated by the noise in the HIPASS data, rather than by the parametrization procedure.

The Survey for Ionization in Neutral Gas Galaxies. I. Description and Initial Results

“…HICAT only includes targets with Galactic standard of rest velocity, V GSR > 300 km s À1 , in order to minimize the contribution of high-velocity clouds ( HVCs), and was created totally blind to the optical properties of the targets. The completeness and reliability of this catalog are well understood ( Zwaan et al 2004), hence it was the primary source for our sample selection and all H i parameters. (2) The HIPASS Bright Galaxy Catalog ( BGC) contains the 1000 HIPASS targets with the brightest peak flux density ( Koribalski et al 2004).…”

“…The fake sources had a wide range of peak fluxes, integrated fluxes, random velocities, and a variety of velocity profile shapes (Gaussian, double-horn, and flat-top) and FWHM velocity widths ranging from 20 to 650 km s À1 . Integrated over all profile shapes and widths, the 95% completeness level for integrated flux is 7.4 Jy km s À1 (Zwaan et al 2004) and corresponds to an H i mass limit of M H i % 1:7 ; 10 6 M D 2 , where D is the distance in Mpc. The details of the observing and reduction methods of HIPASS are outlined in Barnes et al (2001).…”

“…Processing of the HIPASS data resulted in cubes 8 ; 8 in size with a velocity resolution of 18.0 km s À1 , a spatial resolution of $15 0 , and a 3 limiting flux of 40 mJy beam À1 . Zwaan et al (2004) determined the completeness of the survey using a fake source analysis: fake sources were inserted into the HIPASS data cubes, and the HIPASS source finder was used to determine whether the source was detected. The fake sources had a wide range of peak fluxes, integrated fluxes, random velocities, and a variety of velocity profile shapes (Gaussian, double-horn, and flat-top) and FWHM velocity widths ranging from 20 to 650 km s À1 .…”

Formation of disc galaxies in preheated media: a preventative feedback model

“…Blanton et al 2005;Moustakas et al 2013). Surveys in radio bands, such as HIPASS (Meyer et al 2004;Zwaan et al 2004) and ALFALFA (Giovanelli et al 2005b,a), have also made it possible to estimate the cold gas mass function of local galaxies, providing a complete census of the cold baryonic contents of present-day galaxies. Combined with the halo mass function predicted by the current ΛCDM model, these data can be used to statistically establish connections between galaxies and their host dark matter halos (Yang, Mo & van den Bosch 2003;Conroy, Wechsler & Kravtsov 2006;Yang et al 2012Yang et al , 2013Behroozi, Conroy & Wechsler 2010;Behroozi, Wechsler & Conroy 2013;Moster, Naab & White 2013;Lu et al 2013c;Reddick et al 2013).…”

A New 1.4 GHz Radio Continuum Map of the Sky South of Declination +25°

“…Meyer et al (2004); Zwaan et al (2004)]. It has long been recognised that the survey data also contains a wealth of information on the hydrogen recombination lines between H166α and H168α.…”