Volume 584, December 2015
|Number of page(s)||3|
|Published online||27 November 2015|
Limits on the H I content of the dwarf galaxy Hydra II
California Institute of Technology,
1200 E. California Blvd,
2 Oregon Institute of Technology, 3201 Campus Drive, Klamath Falls, OR 97601, USA
3 National Radio Astronomy Observatory, Green Bank, WV 24494, USA
4 Physics and Astronomy Department, Vanderbilt University, PMB 401807, 2401 Vanderbilt Place, Nashville, TN 37240, USA
5 Associated Universities Inc, Av. Nueva Costanera 4091, Suite 502, Vitacura Santiago, Chile
6 Department of Physics, Florida International University, Miami, FL 33199, USA
7 National Radio Astronomy Observatory, PO Box O, Socorro, NM 87801, USA
8 Department of Physics and Astronomy, The University of Toledo, 2825 West Bancroft Street, Toledo, OH 43606, USA
9 Department of Physics and Astronomy, York University, 4700 Keele Street, Toronto, Ontario, M3J 1P3, Canada
Received: 8 September 2015
Accepted: 27 October 2015
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 MHI ≤ 210 M⊙ for a 15 km s-1 linewidth gives a gas to luminosity ratio MHI/ LV ≤ 2.6 × 10-2M⊙L⊙-1. The limits on H I mass and MHI/LV 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.
Key words: galaxies: dwarf / Galaxy: halo / Local Group / galaxies: individual: Hydra II
© ESO, 2015
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