Shock-induced stripping of satellite ISM CGM in IllustrisTNG clusters at z sim0 by Hao Li et al. on Wednesday 30 November

Using the IllustrisTNG simulation, we study the interaction of large-scale

shocks with the circumgalactic medium (CGM) and interstellar medium (ISM) of

star-forming (SF) satellite galaxies in galaxy clusters. These shocks are

usually produced by mergers and massive accretion. Our visual inspection shows

that approximately half of SF satellites have encountered shocks in their host

clusters at $z\leq0.11$. After a satellite crosses a shock front and enters the

postshock region, the ram pressure on it is boosted significantly. Both the CGM

and ISM can be severely impacted, either by striping or compression. The

stripping of the ISM is particularly important for low-mass galaxies with $\log

(M_{*}/M_{\odot})<10$ and can occur even in the outskirts of galaxy clusters.

In comparison, satellites that do not interact with shocks lose their ISM only

in the inner regions of clusters. About half of the ISM is stripped within

about 0.6 Gyr after it crosses the shock front. Our results show that

shock-induced stripping plays an important role in quenching satellite galaxies

in clusters.

arXiv: http://arxiv.org/abs/http://arxiv.org/abs/2209.07711v2