AI Article Synopsis
- Massive galaxies with supermassive black holes produce giant radio lobes that can create significant magnetic pressure, which slows or stops gas from entering smaller halos nearby, impacting star formation.* -
- This negative feedback effect is more pronounced in densely populated regions like protoclusters, where massive galaxies are more common, compared to less populated areas like voids.* -
- The process contributes to a decline in star formation in the universe and could explain changes seen in the galaxy UV luminosity function; future cosmological simulations should incorporate this feedback mechanism for better accuracy.*
Article Abstract
Firmly anchored on observational data, giant radio lobes from massive galaxies hosting supermassive black holes can exert a major negative feedback effect, by endowing the intergalactic gas with significant magnetic pressure hence retarding or preventing gas accretion onto less massive halos in the vicinity. Since massive galaxies that are largely responsible for producing the giant radio lobes, this effect is expected to be stronger in more overdense large-scale environments, such as protoclusters, than in underdense regions, such as voids. We show that by redshift [Formula: see text] halos with masses up to [Formula: see text] are significantly hindered from accreting gas due to this effect for radio bubble volume filling fraction of [Formula: see text], respectively. Since the vast majority of the stars in the universe at [Formula: see text][Formula: see text] 2 to 3 form precisely in those halos, this negative feedback process is likely one major culprit for causing the global downturn in star formation in the universe. It also provides a natural explanation for the rather sudden flattening of the slope of the galaxy rest-frame UV luminosity function around [Formula: see text]. A cross-correlation between protoclusters and Faraday rotation measures may test the predicted magnetic field. Inclusion of this external feedback process in the next generation of cosmological simulations may be imperative.
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| http://www.ncbi.nlm.nih.gov/pmc/articles/PMC11363313 | PMC |
| http://dx.doi.org/10.1073/pnas.2402435121 | DOI Listing |
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