Quasar Feedback and Structure Formation

Astronomy and Astrophysics – Astrophysics

Scientific paper

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Scientific paper

Quasar outflows, in the form of broad-absorption line winds and radio jets,are likely to have left an indelible cosmological imprint. As energeticmaterial from the densest objects in the centers of galaxies made its wayinto the intergalactic medium (IGM), it impacted structures on many scales,much as supernovae impact structures on many scales within the interstellarmedium. Using simple analytical models, I will outline several observationalfeatures that are likely to have been caused by these interactions. As largeregions of the IGM are shocked heated above a critical entropy of 100 keV cm^2,cooling becomes impossible within them, regardless of further changes indensity. On quasar scales, this has the effect of inhibiting formation,resulting in the observed fall-off in their number densities below z = 2.On galaxy scales, quasar feedback fixes the turn-over scale in the galaxyluminosity function (L_*) as the nonlinear scale at the redshift of strongfeedback. The galaxy luminosity function then remains largely fixed afterthis epoch, consistent with recent observations and in contrast to the strongevolution predicted in more standard galaxy-formation models. Finally, strongquasar feedback explains why the intracluster medium is observed to have beenpre-heated to entropy levels just above the minimum excess that would not havebeen erased by cooling.

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