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

Publications of the Astronomical Society of Australia

Geraint F. Lewis¹ 

[1] Michael J. Irwin

关键词: galaxies: dwarf;    Local Group;    techniques: image processing;   

DOI  :  10.1071/AS02006

学科分类：天文学(综合)

来源: CSIRO

【 摘 要 】

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.

【 授权许可】

Unknown