The effect of ram-pressure stripping on dwarf galaxies

Steyrleithner, P.; Hensler, G.; Boselli, A.

doi:10.1093/mnras/staa775

The effect of ram-pressure stripping on dwarf galaxies

Journal Article · Thu Apr 02 00:00:00 EDT 2020 · Monthly Notices of the Royal Astronomical Society

DOI:https://doi.org/10.1093/mnras/staa775· OSTI ID:1608728

Steyrleithner, P. ^[1]; Hensler, G. ^[1]; Boselli, A. ^[2]

Department for Astrophysics, University of Vienna, Türkenschanzstrasse 17, A-1180 Vienna, Austria
Aix Marseille Universitæ, CNRS, LAM (Laboratoire diAstrophysique de Marseille), UMR 7326, F-13388 Marseille, France

ABSTRACT

Ram-pressure stripping (RPS) is a well observed phenomenon of massive spiral galaxies passing through the hot intracluster medium (ICM) of galaxy clusters. For dwarf galaxies (DGs) within a cluster, the transformation from gaseous to gas-poor systems by RPS is not easily observed and must happen in the outskirts of clusters. In a few objects in close by galaxy clusters and the field, RPS has been observed. Since cluster early-type DGs also show a large variety of internal structures (unexpected central gas reservoirs, blue stellar cores, composite radial stellar profiles), we aim in this study to investigate how ram pressure (RP) affects the interstellar gas content and therefore the star formation (SF) activity. Using a series of numerical simulations, we quantify the dependence of the stripped-off gas on the velocity of the infalling DGs and on the ambient ICM density. We demonstrated that SF can be either suppressed or triggered by RP depending on the ICM density and the DGs mass. Under some conditions, RP can compress the gas, so that it is unexpectedly retained in the central DG region and forms stars. When gas clouds are still bound against stripping but lifted from a thin disc and fall back, their new stars form an ellipsoidal (young) stellar population already with a larger velocity dispersion without the necessity of harassment. Most spectacularly, star clusters can form downstream in stripped-off massive gas clouds in the case of strong RP. We compare our results to observations.

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Sponsoring Organization:: USDOE

OSTI ID:: 1608728

Journal Information:: Monthly Notices of the Royal Astronomical Society, Journal Name: Monthly Notices of the Royal Astronomical Society Journal Issue: 1 Vol. 494; ISSN 0035-8711

Publisher:: Oxford University PressCopyright Statement

Country of Publication:: United Kingdom

Language:: English

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