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Limits on the HI content of the dwarf galaxy Hydra II

Sensitive 21cm HI 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 5-sigma limit of MHI < 210 solar masses for a 15 km/s linewidth gives a gas-to-luminosity ratio MHI/L_V < 2.6 x 10^{-2} Mo / Lo. The limits on HI mass and MHI/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.

preprint2015arXivOpen access
Andrew JanzenEve M. KlopfFelix J. LockmanRodolfo Montez JrKurt PlarreNau Raj PokhrelRobert J. SelinaA. TogiMehrnoush Zomederis
astro-ph.GA
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Andrew JanzenEve M. KlopfFelix J. LockmanRodolfo Montez JrKurt PlarreNau Raj PokhrelRobert J. SelinaA. TogiMehrnoush Zomederis

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