Astrophys. J., 913, 53-53 (2021/May-3)
The gas content and stripping of Local Group dwarf galaxies.
PUTMAN M.E., ZHENG Y., PRICE-WHELAN A.M., GRCEVICH J., JOHNSON A.C., TOLLERUD E. and PEEK J.E.G.
Abstract (from CDS):
The gas content of the complete compilation of Local Group dwarf galaxies (119 within 2 Mpc) is presented using H I survey data. Within the virial radius of the Milky Way (224 kpc here), 53 of 55 dwarf galaxies are devoid of gas to limits of M_H I_ < 104 M☉. Within the virial radius of M31 (266 kpc), 27 of 30 dwarf galaxies are devoid of gas (with limits typically <105 M☉). Beyond the virial radii of the Milky Way and M31, the majority of the dwarf galaxies have detected H I gas and H I masses higher than the limits. When the relationship between gas content and distance is investigated using a Local Group virial radius, more of the nondetected dwarf galaxies are within this radius (85 ± 1 of the 93 nondetected dwarf galaxies) than within the virial radii of the Milky Way and M31. Using the Gaia proper-motion measurements available for 38 dwarf galaxies, the minimum gas density required to completely strip them of gas is calculated. Halo densities between 10–5 and 5 x 10–4 cm–3 are typically required for instantaneous stripping at perigalacticon. When compared to halo density with radius expectations from simulations and observations, 80% of the dwarf galaxies with proper motions are consistent with being stripped by ram pressure at Milky Way pericenter. The results suggest that a diffuse gaseous galactic halo medium is important in quenching dwarf galaxies, and that a Local Group medium also potentially plays a role.
© 2021. The Author(s). Published by the American Astronomical Society.
Local Group - Dwarf galaxies - Galaxy quenching - Circumgalactic medium - Interstellar medium - Intergalactic medium - Andromeda Galaxy - Milky Way Galaxy
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