SIMBAD references

2021ApJ...913...53P - Astrophys. J., 913, 53-53 (2021/May-3)

The gas content and stripping of Local Group dwarf galaxies.


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.

Abstract Copyright: © 2021. The Author(s). Published by the American Astronomical Society.

Journal keyword(s): Local Group - Dwarf galaxies - Galaxy quenching - Circumgalactic medium - Interstellar medium - Intergalactic medium - Andromeda Galaxy - Milky Way Galaxy

Status at CDS : Large table(s) will be appraised for possible ingestion in VizieR.

Simbad objects: 123

goto Full paper

goto View the references in ADS

To bookmark this query, right click on this link: simbad:2021ApJ...913...53P and select 'bookmark this link' or equivalent in the popup menu


© Université de Strasbourg/CNRS

    • Contact