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The 1000 brightest HIPASS galaxies: newly cataloged galaxies

journal contribution
posted on 2023-05-16, 13:57 authored by Ryan-Weber, E, Koribalski, BS, Staveley-Smith, L, Jerjen, H, Kraan-Korteweg, RC, Ryder, SD, Barnes, DG, de Blok, WJG, Kilborn, VA, Bhathal, R, Boyce, PJ, Disney, MJ, Drinkwater, MJ, Ekers, RD, Freeman, KC, Gibson, BK, Green, AJ, Haynes, RF, Henning, PA, Juraszek, S, Kesteven, MJ, Knezek, PM, Mader, S, Marquarding, M, Meyer, M, Minchin, RF, Mould, JR, O'Brien, J, Oosterloo, T, Price, RM, Putman, ME, Sadler, EM, Schroder, A, Stewart, IM, Stootman, F, Waugh, M, Webster, RL, Wright, AE, Zwaan, MA
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.

History

Publication title

The Astronomical Journal

Volume

124

Issue

4

Pagination

1954-1974

ISSN

0004-6256

Department/School

School of Natural Sciences

Publisher

University of Chicago Press

Place of publication

Chicago, USA

Repository Status

  • Restricted

Socio-economic Objectives

Expanding knowledge in the mathematical sciences

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