Limits on the HI content of the dwarf galaxy Hydra II
Andrew Janzen, Eve M. Klopf, Felix J. Lockman, Rodolfo Montez Jr, Kurt, Plarre, Nau Raj Pokhrel, Robert J. Selina, A. Togi, Mehrnoush Zomederis
TL;DR
This study used sensitive 21cm HI observations to set upper limits on the neutral hydrogen content of Hydra II, a dwarf galaxy near the Milky Way, finding its gas properties are typical of similar galaxies.
Contribution
First measurement of HI content limits in Hydra II, providing insights into its gas properties and relation to other dwarf galaxies near the Milky Way.
Findings
No neutral hydrogen detected in Hydra II.
Upper limit on HI mass: < 210 solar masses.
Gas-to-luminosity ratio is typical for similar dwarf galaxies.
Abstract
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.
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