Detection of HI associated with the Sculptor Dwarf Spheroidal Galaxy

Details Detection of HI associated with the Sculptor Dwarf Spheroidal Galaxy Detection of HI associated with the Sculptor Dwarf Spheroidal Galaxy

1998-07-21

arxiv.org/abs/astro-ph/9807222v1

Astronomy and Astrophysics

Astrophysics

17 pages (aas2pp4.sty) including all 5 tables and 8 postscript figures. Accepted for publication in AJ

Scientific paper

10.1086/300540

Neutral hydrogen (HI) has been detected in the Local Group dwarf spheroidal galaxy Sculptor with the 64 m Parkes single dish and mapped with the Australia Telescope synthesis array. Most of the detected HI is in two clouds \sim 15'-20' away from the optical center. The gas is observed at the same systemic velocity than the stars but at \ge 125 \kms away from the Magellanic Stream components in that region. A lower limit to the HI mass of 3.0 \times 10^4 \Msol is derived from the synthesis observation for an M_HI/L_B \simeq 0.02. This amount of HI is compatible with mass loss expected from normal giants even if only 10% of the gas is retained by the galaxy in its neutral form.

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