AAT/WFI observations of the Extragalactic H I Cloud HIPASS J1712-64

Details AAT/WFI observations of the Extragalactic H I Cloud HIPASS J1712-64 AAT/WFI observations of the Extragalactic H I Cloud HIPASS J1712-64

2002-05-02

arxiv.org/abs/astro-ph/0205033v1

Astronomy and Astrophysics

Astrophysics

8 pages, accepted for publication in PASA (Figures reduced in resolution, please contact gfl if you wish the higher resolution

Scientific paper

10.1071/AS02006

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 M_g -7 at a distance of 3Mpc, 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.

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