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How to quench a galaxy

19 Sep 2020, 16:05 UTC
How to quench a galaxy
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Title: How do central and satellite galaxies quench? – Insights from spatially resolved spectroscopy in the MaNGA surveyAuthors: Bluck, A., Maiolino, R., Piotrowska, J., Trussler, J., Ellison, S., Sanchez, S., Thorp, M., Teimoorinia, H., Moreno, J., and Conselice, C.First Author’s Institution: Kavli Institute for Cosmology and Cavendish Laboratory – Astrophysics Group, University of CambridgeStatus: Accepted for publication in MNRASWhen astronomers look at galaxies in our universe, they found that they were usually either red or blue. Only a handful of galaxies lay somewhere in between, the so-called “green valley.” (If you’re wondering why it isn’t the purple valley, remember that green is between red and blue on a light spectrum.) Figure 1 illustrates this bimodal distribution in terms of star formation rate.Hotter, younger stars give off more blue light, while cooler, older stars give off more red light. Galaxies that are still actively star-forming have younger stars and thus are bluer, while galaxies that have mostly shut-down star formation are redder. Galaxies that have shut down star formation are referred to as “quenched.” Stars form from the intergalactic gas, and if the quenching process were simply a matter of using up the gas over time, we would expect to see ...

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