The HIPASS catalogue – III. Optical counterparts and isolated dark galaxies

doi:10.1111/j.1365-2966.2005.09159.x

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Wiley InterScience

Monthly Notices of the Royal Astronomical Society

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Monthly Notices of the Royal Astronomical Society: Letters

Volume 361 Issue 1, Pages 34 - 44

Published Online: 10 Jun 2005

A Journal of the Royal Astronomical Society

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The HIPASS catalogue – III. Optical counterparts and isolated dark galaxies

M. T. Doyle ^1★ , M. J. Drinkwater ¹ , D. J. Rohde ¹ , K. A. Pimbblet ¹ , M. Read ² , M. J. Meyer ^3,4 , M. A. Zwaan ⁵ , E. Ryan-Weber ^3,6 , J. Stevens ³ , B. S. Koribalski ⁷ , R. L. Webster ³ , L. Staveley-Smith ⁷ , D. G. Barnes ³ , M. Howlett ⁸ , V. A. Kilborn ^8,9 , M. Waugh ³ , M. J. Pierce ⁸ , R. Bhathal ¹⁰ , W. J. G. de Blok ¹¹ , M. J. Disney ¹¹ , R. D. Ekers ⁷ , K. C. Freeman ¹² , D. A. Garcia ¹¹ , B. K. Gibson ⁸ , J. Harnett ¹³ , P. A. Henning ¹⁴ , H. Jerjen ¹² , M. J. Kesteven ⁷ , P. M. Knezek ¹⁵ , S. Mader ⁷ , M. Marquarding ⁷ , R. F. Minchin ¹¹ , J. O'Brien ¹² , T. Oosterloo ¹⁶ , R. M. Price ¹⁴ , M. E. Putman ¹⁷ , S. D. Ryder ¹⁸ , E. M. Sadler ¹⁹ , I. M. Stewart ²⁰ , F. Stootman ¹⁰ and A. E. Wright ⁷

¹ Department of Physics, University of Queensland, Brisbane, QLD 4072, Australia ² WFAU, Institute for Astronomy, Royal Observatory, Blackford Hill, Edinburgh EH9 3HJ ³ School of Physics, University of Melbourne, VIC 3010, Australia ⁴ Space Telescope Science Institute, 3700 San Martin Drive, Baltimore MD 21218, USA ⁵ European Southern Observatory, Karl-Schwarzschild-Str.2, 85748 Garching b. Munchen, Germany ⁶ Institute of Astronomy, University of Cambridge, Madingly Road, Cambridge CB3 0HA ⁷ Australia Telescope National Facility, CSIRO, PO Box 76, Epping, NSW 1710, Australia ⁸ Centre for Astrophysics and Supercomputing, Swinburne University of Technology, PO Box 218, Hawthorn, VIC 3122 Australia ⁹ Jodrell Bank Observatory, University of Manchester, Macclesfield, Cheshire SK11 9DL ¹⁰ Department of Physics, University of Western Sydney Macarthur, PO Box 555, Campbelltown, NSW 2560, Australia ¹¹ School of Physics and Astronomy, Cardiff University, The Parade, Cardiff CF24 3YB ¹² Research School of Astronomy and Astrophysics, Mount Stromlo Observatory, Cotter Road, Weston, ACT 2611, Australia ¹³ University of Technology Sydney, Broadway NSW 2007, Australia ¹⁴ Institute for Astrophysics, University of New Mexico, 800 Yale Blvd, NE, Albuquerque, NM 87131, USA ¹⁵ WIYN, Inc. 950 North Cherry Avenue, Tucson, AZ 85719 USA ¹⁶ ASTRON, PO Box 2, 7990 AA Dwingeloo, the Netherlands ¹⁷ Department of Astronomy, University of Michigan, Ann Arbor, MI 48109 ¹⁸ Anglo-Australian Observatory, PO Box 296, Epping, NSW 1710, Australia ¹⁹ School of Physics, University of Sydney, NSW 2006, Australia ²⁰ Department of Physics and Astronomy, University of Leicester, Leicester LE1 7RH

Correspondence to ^★ E-mail: mtdoyle@physics.uq.edu.au

KEYWORDS

methods: data analysis • catalogues • surveys • galaxies: photometry • radio lines: galaxies

ABSTRACT

We present the largest catalogue to date of optical counterparts for H i radio-selected galaxies, HOPCAT. Of the 4315 H i radio-detected sources from the H i Parkes All Sky Survey (HIPASS) catalogue, we find optical counterparts for 3618 (84 per cent) galaxies. Of these, 1798 (42 per cent) have confirmed optical velocities and 848 (20 per cent) are single matches without confirmed velocities. Some galaxy matches are members of galaxy groups. From these multiple galaxy matches, 714 (16 per cent) have confirmed optical velocities and a further 258 (6 per cent) galaxies are without confirmed velocities. For 481 (11 per cent), multiple galaxies are present but no single optical counterpart can be chosen and 216 (5 per cent) 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 A_Bj < 1 mag and the blank-fields category. Of the 3692 galaxies with an A_Bj 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.

Accepted 2005 April 27. Received 2005 April 7

DIGITAL OBJECT IDENTIFIER (DOI)

10.1111/j.1365-2966.2005.09159.x About DOI