How to Kill a Galaxy

Our Milky Way galaxy is alive and well, producing new stars all the time. But there’s another group of galaxies out there, populated only by venerable red dwarf stars – the young stars are nowhere to be seen. In effect, these galaxies are… dead. How did they die?

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Sources:

Cause of galactic death: strangulation

https://www.nature.com/articles/nature14439
https://arxiv.org/abs/1505.03143
https://arxiv.org/abs/1407.1078
https://arxiv.org/abs/1601.06080
https://skyandtelescope.org/astronomy-resources/kavli-foundation-how-do-galaxies-die/
https://www.kavlifoundation.org/kavli-news/supermassive-black-hole-wind-can-stop-new-stars-forming#.Xq_Z31NKgWq
https://arxiv.org/abs/1605.07626
https://www.space.com/35374-dead-galaxies-killed-by-gas-stripping.html
https://astronomy.swin.edu.au/cosmos/R/Ram+Pressure+Stripping
https://arxiv.org/abs/1611.00896
https://sci.esa.int/web/hubble/-/45600-ram-pressure-stripping-galaxies-ngc-4522-and-ngc-4402

Image Sources:
https://images.nasa.gov/details-PIA10748

Astronomers Discover Unusual Monster Galaxy in the Very Early Universe

https://commons.wikimedia.org/wiki/File:06-Local_Group_(LofE06250).png
http://skyserver.sdss.org/dr16/en/tools/chart/image.aspx?ra=136.10873&dec=41.48379&width=512&height=512&scale=0.4
https://svs.gsfc.nasa.gov/vis/a010000/a010900/a010943/index.html
https://commons.wikimedia.org/wiki/File:NGC_4522_Hubble_heic0911b.jpg