The 1000 brightest HIPASS galaxies

newly cataloged galaxies

E. Ryan-Weber*, B. S. Koribalski, L. Staveley-Smith, H. Jerjen, R. C. Kraan-Korteweg, S. D. Ryder, D. G. Barnes, W. J. G. De Blok, V. A. Kilborn, R. Bhathal, P. J. Boyce, M. J. Disney, M. J. Drinkwater, R. D. Ekers, K. C. Freeman, B. K. Gibson, A. J. Green, R. F. Haynes, P. A. Henning, S. Juraszek & 19 others M. J. Kesteven, P. M. Knezek, S. Mader, M. Marquarding, M. Meyer, R. F. Minchin, J. R. Mould, J. O'Brien, T. Oosterloo, R. M. Price, M. E. Putman, E. M. Sadler, A. Schröder, I. M. Stewart, F. Stootman, M. Waugh, R. L. Webster, A. E. Wright, M. A. Zwaan

*Corresponding author for this work

Research output: Contribution to journalArticle

29 Citations (Scopus)

Abstract

The H I Parkes All-Sky Survey (HIPASS) is a blind 21 cm survey for extragalactic neutral hydrogen, covering the whole southern sky. The HIPASS Bright Galaxy Catalog (BGC) is a subset of HIPASS and contains the 1000 H I-brightest (peak flux density) galaxies. Here we present the 138 HIPASS BGC galaxies that had no redshift measured prior to the Parkes multibeam H I surveys. Of the 138 galaxies, 87 are newly cataloged. Newly cataloged is defined as having no optical (or infrared) counterpart in the NASA/IPAC Extragalactic Database. Using the Digitized Sky Survey, we identify optical counterparts for almost half of the newly cataloged galaxies, which are typically of irregular or Magellanic morphological type. Several H I sources appear to be associated with compact groups or pairs of galaxies rather than an individual galaxy. The majority (57) of the newly cataloged galaxies lie within 10° of the Galactic plane and are missing from optical surveys as a result of confusion with stars or dust extinction. This sample also includes newly cataloged galaxies first discovered by Henning et al. in the H I shallow survey of the zone of avoidance. The other 30 newly cataloged galaxies escaped detection because of their low surface brightness or optical compactness. Only one of these, HIPASS J0546-68, has no obvious optical counterpart, as it is obscured by the Large Magellanic Cloud. We find that the newly cataloged galaxies with |b| > 10° are generally lower in H I mass and narrower in velocity width compared with the total HIPASS BGC. In contrast, newly cataloged galaxies behind the Milky Way are found to be statistically similar to the entire HIPASS BGC. In addition to these galaxies, the HIPASS BGC contains four previously unknown H I clouds.

Original languageEnglish
Pages (from-to)1954-1974
Number of pages21
JournalAstronomical Journal
Volume124
Issue number4
DOIs
Publication statusPublished - 1 Oct 2002
Externally publishedYes

Keywords

  • Galaxies: distances and redshifts
  • Galaxies: fundamental parameters
  • Galaxies: kinematics and dynamics
  • Radio emission lines
  • Surveys

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