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AAT/WFI Observations of the Extragalactic HI Cloud HIPASS J1712-64

Published online by Cambridge University Press:  05 March 2013

Geraint F. Lewis ,
Michael J. Irwin ,
Rodrigo A. Ibata  and
Brad K. Gibson
Geraint F. Lewis
Affiliation:
Anglo-Australian Observatory, PO Box 296, Epping, NSW 1710, Australia; [email protected]
Michael J. Irwin
Affiliation:
Institute of Astronomy, Madingley Rd, Cambridge, CB3 0HA, UK; [email protected]
Rodrigo A. Ibata
Affiliation:
Observatoire de Strabourg, 11, rue de l'Universite, F-67000, Strasbourg, France; [email protected]
Brad K. Gibson
Affiliation:
Centre for Astrophysics & Supercomputing, Swinburne University, PO Box 218, Hawthorn, Victoria 3122, Australia; [email protected]
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Abstract

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AAT/WFI optical images of a candidate extragalactic HI cloud, HIPASS J1712–64, are presented. The g and r band CCD mosaic camera frames were processed using a new data pipeline recently installed at the AAO. The resultant stacked images reach significantly deeper levels than those of previous published optical imaging of this candidate, providing a detection limit Mg ˜ −7 at a distance of 3 Mpc, the inferred distance to HIPASS J1712–64. However, detailed analysis of the images fails to uncover any stellar population associated with the HI emission. If this system is a member of the Local Group then it is pathologically different to other members. Hence, our observations reinforce earlier suggestions that this HI cloud is most likely Galactic in origin and not a Local Volume dwarf galaxy.

Keywords

galaxies: dwarfLocal Grouptechniques: image processing
Type
Research Article
Information
Publications of the Astronomical Society of Australia , Volume 19 , Issue 2 , 2002 , pp. 257 - 259
Copyright
Copyright © Astronomical Society of Australia 2002

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