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CORRELATIONS. “All of these studies in the hard and soft X-ray range find that the cosmic evolution of AGN is strongly dependent on the AGN luminosity: the number density of successively less luminous AGN peaks at lower redshifts, with the lowest luminosity AGN showing a basically constant number density.” (AGN = active galactic nuclei). https://lnkd.in/d9JV8md View in LinkedIn

RARE BLACK HOLES. “More recently, it was discovered that very massive black holes (BH; 10(9) M⊙) appears to exist already at z ∼ 6 and higher, but they are extremely rare, in accordance with this trend.” (BH = black hole; z = redshift). https://lnkd.in/d9JV8md View in LinkedIn

THE CURVE. “It has been known since early optical quasar surveys that the comoving number density of luminous quasars has a pronounced peak at a redshift around z = 2–2.5, with a fairly steep decline at higher and lower redshift.” https://lnkd.in/d9JV8md View in LinkedIn

EXPLAINING THE HEAVENS. “Our best-fitting model suggests a scenario in which disc instabilities are the main driver for moderately luminous Seyfert galaxies at low redshift, while major mergers are the main trigger for luminous AGN.” (AGN = active galactic nuclei). https://lnkd.in/d9JV8md View in LinkedIn

DOWNSIZING EXPLANATION. “With these three modifications, the models can explain the observed downsizing, successfully reproduce the bolometric AGN luminosity function and simultaneously reproduce galaxy and BH properties in the local Universe.” (BH = black hole; AGN = active galactic nuclei). https://lnkd.in/d9JV8md View in LinkedIn

The waxy magnolia comes forh in the growing summer heat, flawless in the growing energy and commotion. View in LinkedIn

WARP SPEED. “When the Chinese released the sequence of the SARS-CoV-2 virus, we started the process of making RNA the next day. A couple weeks later, we were injecting animals with the vaccine." A very long time to until the acceptance of mRNA vaccines, whose promises for the future are considerable. See my TEDx talk. https://lnkd.in/dc32WbP View in LinkedIn

HIERARCHICAL MODEL. “In this model, BHs evolve from light seeds (∼100 M⊙) and their growth is merger driven. The original Somerville et al. model (baseline model) reproduces the number density of AGN at intermediate redshifts and luminosities, but underproduces luminous AGN at very high redshift (z > 3) and overproduces them at low redshift (z < 1).” (BH = black hole; AGN = active galactic nuclei). https://lnkd.in/d9JV8md View in LinkedIn

GOALS. “We investigate whether this observed ‘downsizing’ in BH growth is reproduced in a semi-analytic model for the formation and evolution of galaxies and BHs, set within the hierarchical paradigm for structure formation.” (BH = black hole) https://lnkd.in/d9JV8md View in LinkedIn