Limits on the H I content of the dwarf galaxy Hydra II

Abstract

Sensitive 21 cm H I  observations have been made with the Green Bank Telescope toward the newly-discovered Local Group dwarf galaxy Hydra II, which may lie within the leading arm of the Magellanic Stream. No neutral hydrogen was detected. Our 5σ limit of M_(HI) ≤ 210 M_⊙ for a 15 km s^(-1) linewidth gives a gas to luminosity ratio M_(HI)/ L_V ≤ 2.6 × 10^(-2) M_⊙ L_⊙^(-1). The limits on H I  mass and M_(HI)/L_V are typical of dwarf galaxies found within a few hundred kpc of the Milky Way. Whatever the origin of Hydra II, its neutral gas properties are not unusual.

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